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Five heads think better than one July 9th, 2017 by

Vea la versión en español a continuación

Innovation fairs are becoming a popular way to showcase agricultural invention, and to link some original thinkers with a wider community.

On the 28th of June I was at an innovation fair in Cochabamba, held in a ballroom that is usually rented for weddings and big parties, but with some tweaking it was a fine space for farmers and researchers to meet. Each organization had a table where they could set out products or samples, with their posters displayed behind the presenters.

For example, at one table, I met a dignified, white-haired agronomist, Gonzalo Zalles who explained his work with “deep beds” for raising healthy, odorless pigs. I told Mr. Zalles about some pigs I had seen in Uganda (Smelling is believing), but Eng. Zalles explained that he makes a slightly more sophisticated bed. He starts by digging a pit, then adding a thin layer of lime to the base, followed by a layer of sand. In Uganda, some innovative farmers raise pigs on wood shavings, but Zalles uses rice husks as the final layer. He says they are more absorbent than wood shavings.

I asked if he added Effective Microorganisms (a trademarked brand of yeast and other microbes that are used widely, not just in Uganda, but also to make bokashi fertilizer in Nepal, see The bokashi factory). But no, in Bolivia, swine farmers are using a mix of bacteria and yeast called BioBull, which is made by Biotop, a subsidiary of the Proinpa Foundation in Cochabamba.

José Olivera CamachoAt a nearby stall I caught up with José Olivera of Biotop who was displaying not just BioBull, but other biological products as well, including insecticides and fungicides for organic agriculture. José travels all over the Bolivian Altiplano selling these novel inputs to farmers. He may soon have another product to sell, if research goes to plan at the Panaseri Company, in Cochabamba. Panaseri collaborates with Proinpa to produce food products from the lupine bean, packaged for supermarkets under the brand Tarwix.  At the Panaseri stand, Norka Ojeda, a Proinpa communicator, explained that the Tarwix factory buys lupine beans (tarwi) from farmers and washes out the poisonous alkaloids, rendering the nutritious tarwi safe to eat. (Read more about lupines at Crop with an attitude).

tarwixThe people at Panaseri originally disposed of the alkaloids without any treatment. But they became concerned about the environmental impact, so they installed filters at their plant to remove the toxins from the water. Now researchers at Biotop are studying the possibility of using the alkaloids as ingredients in new botanical insecticides.

Linking researchers to farmers’ associations and companies seems to be bearing fruit. Raising swine without the bad smell is crucial for keeping livestock near cities, where it is easy to get supplies and the market for the final product is nearby. Inventing new bio-pesticides is key to keeping chemical poisons out of our food.  Many heads think better than one.

Acknowledgements

The innovation fair was hosted by Fundación Valles, Fundesnap and other partners of the Fondo de Innovación on 28 June 2017, with funding from Danida (Danish Aid).

Further viewing

Watch a video on tarwi here.

CINCO CABEZAS PIENSAN MEJOR QUE UNA

Las ferias de innovación se están volviendo una manera popular de mostrar la invención agrícola, y para organizar a algunas personas creativas en una comunidad mayor.

El 28 de junio asistí a una feria de innovación en Cochabamba, en un salón de eventos que normalmente se alquila para bodas y quinceañeras, pero con algunos ajustes sirvió perfectamente para el encuentro de agricultores e investigadores. Cada organización tenía una mesa donde podían mostrar sus productos o muestras, con sus pósteres a la vista detrás de los interesados.

Por ejemplo, en una mesa conocí a un destacado agrónomo con una cabellera blanca, Gonzalo Zalles quien explicó su trabajo con “camas profundas” para criar a chanchos sanos sin olores. Le conté al Ing. Zalles de los cerdos que yo había visto en Uganda (Smelling is believing), pero él explicó que él hace una cama un poco más sofisticada. Empieza cavando una fosa, agregando una capa de cal y una de arena. En Uganda, Algunos agricultores innovadores crían a los cerdos en aserrín, pero el Ing. Zalles usa cáscara de arroz como la última capa. Él dice que es más absorbente que el aserrín.

Le pregunté si él agregaba los Microorganismos Efectivos (una marca registrada de levadura con otros microbios que se usa ampliamente, no solo en Uganda, sino también para hacer fertilizante tipo bokashi en Nepal, vea The bokashi factory). Pero no, en Bolivia, los porcicultores usan una mezcla de bacteria con levadura llamada BioBull, un producto de Biotop, que es un subsidiario de la Fundación Proinpa en José Olivera CamachoCochabamba.

En otra mesa encontré a José Olivera de Biotop quien mostraba no solo el BioBull, sino otros productos biológicos, incluso insecticidas y fungicidas para la agricultura orgánica. José viaja por todo el Altiplano boliviano vendiendo esos insumos novedosos a los agricultores. Él pronto tendrá otro producto para vender, si la investigación va bien con la compañía Panaseri, en Cochabamba. Panaseri colabora con Proinpa para producir empaquetar tarwi (lupino) para supermercados, bajo la marca Tarwix.  En el stand de Panaseri, Norka Ojeda, comunicadora de Proinpa, explicó que la fábrica de Tarwix compra tarwi de los productores y lava los venenosos alcaloides, para que el nutritivo tarwi sea sano para comer. (Lea más sobre el tarwi aquí: Cultivo con carácter fuerte).

tarwixLa fábrica de Panaseri tiene que descartar los alcaloides, pero la empresa se cuestionó del impacto ambiental, así que instalaron filtros en su planta para quitar las toxinas del agua. Ahora los investigadores de Biotop están estudiando la posibilidad de usar los alcaloides como ingredientes en nuevos insecticidas botánicos.

Vincular los investigadores con asociaciones de productores y empresas parece dar fruto. Criar cerdos sin malos olores es crucial para la porcicultura cerca de las ciudades, donde es conveniente comprar la comida de los cerdos y vender los productos finales. El invento de nuevos bio-plaguicidas es clave para evitar de envenenar nuestra comida. Sí parece que varias cabezas piensan mejor que una sola.

Agradecimientos

La Feria de Innovación fue auspiciada por la Fundación Valles, Fundesnap y otros socios del Fondo de Innovación el 28 de junio del 2017, con financiamiento de Danida (Ayuda Danesa).

Para ver más

Vea el video sobre tarwi aquí.

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Tuta on the move July 2nd, 2017 by

The tomato is a remarkably versatile plant, with a huge number of different varieties, most of which are easy to grow. It is a popular crop with many farmers, a reflection of the strong demand from consumers in many countries. But the tomato is also prone to many pests and diseases and physiological disorders. The tomato plant is closely related to the potato and both suffer from similar diseases, including late blight, bacterial wilt and a host of viruses.

Twine for tomatoes copyTomatoes tend to be grown in small plots or in polytunnels and glasshouses, so I still recall my surprise a few years ago when I saw my largest tomato field ever in Mato Grasso state in Brazil. Double rows of tomatoes several hundred metres long were planted on a gentle downward slope. A team of workers were tying the plants to twine stretched between large poles of eucalyptus set about five metres apart. A tractor stood by, ready to carry new poles along the rows

It was an impressive operation, though I worried about the efficiency of large scale production as I watched the workers working hard to remove vigorous weeds. I also saw a number of serious diseases when I walked a short distance along the rows. More recently, I came across more large fields of tomatoes in Kyrgyzstan, during a series of visits in Chuy district with Alieve Nur and colleagues. Alieve works for Ailana, a local food processing company that produces tomato purée and tomato juice and cans vegetables and fruit.

P1040311 copyAilana have 126 contracted out-growers, most of whom have started to grow tomatoes in the last few years. The fields were set up in a different way to those in Mato Grosso. The tomatoes were direct-drilled by tractor, rather than being planted out as seedlings. The method appears to work, though there were a few gaps where no seeds had been apparently sown – or had failed to grow. They were bushy tomatoes so didn’t need staking. Which is just as well, since the largest field I saw was 52 ha. Imagine a rough square with each side 700 metres long. It would take over 30 minutes to walk around all four sides.

The other unusual thing I noticed was the absence of any major pests and diseases and weeds. The tomato plants were only a month old so maybe this was too early in the season for infections and infestations to develop. Or maybe the crop had been treated with pesticides, though there was no direct evidence of this taking place. During my day out I was presented with odd bits of leaves that were drying out or showing minor damage. Nothing to worry about, I said. But when you have a large area of a valuable crop any sign of disease can cause anxiety and precipitate hasty spraying.

Damaged fruit cut open 3 copySo far Tuta has only been found in glasshouses around Bishkek. It is unclear whether it will cause as much damage in open fields as it does in enclosed spaces, where favourable conditions lead to rapid spread of the highly damaging caterpillars. Nor is it clear how a farmer with a 52 ha field is going to control Tuta. This is a huge area for putting out pheromone traps, for example, and an expensive task as well.

There is some hope that the long, cold winters may wipe out Tuta every year, though continuous production in heated glasshouses will provide a refuge and the insect has an uncanny ability to survive hard times and re-emerge to attack afresh. In the UK my colleague Martin McPherson suggested to me that the high risk of late blight in open fields discourages farmers from this method of production.

Demand for tomatoes is growing in Kyrgyzstan and the season is short, so it makes sense to maximize production from fertile soils in open fields. Water is freely available. Farmers will now be closely monitoring the current tomato harvest for Tuta damage. Fortunately, wholesale buyers of tomatoes, such as Ailana, are already thinking about how to help farmers cope with this new threat. For the many people with a small garden plot of tomatoes it’s less clear who will be giving them advice.

Reference

Esenali Uulu T, Ulusoy MR, Çaliskan AF, 2017. First record of tomato leafminer Tuta absoluta in Kyrygyzstan. EPPO Bulletin. doi: 10.1111/epp.12390

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Are you poor? May 7th, 2017 by

Big smile with banana bunch on head copyWhen Jeff, Paul and I write these blogs we chose our words carefully. We want to paint a positive yet realistic picture of development, reflecting an optimism founded on first-hand experiences. Yet it can be difficult when writing about the poorer regions of the world to avoid emphasising poverty and creating a spiral of despair, however unintentional.

The recent vogue in development is to classify countries by income, the latest in a long list of attempts to find a neutral way to describe poor countries. We have come a long way since Henry Kissinger’s crude and infamous description of Bangladesh as a “basket case”, back in the 1970s. “Third World” countries prevailed for a while, but its use faded as political divisions between East and West began to disappear.

In 1987, the Brundtland Commission on Environment and Development proposed the use of North and South to distinguish rich and developed nations from their impoverished counterparts. This has never quite caught on, though “the global South” is still in current use. “Under-developed” countries had a patronising ring to it and though “developing countries” has a more positive connotation it has never really conveyed a strong sense of transition out of poverty.

Now we have low, middle and high income countries, with rankings monitored by the Organisation for Economic Cooperation and Development (OECD). Donors find this classification a convenient way to separate countries in terms of needs and to target funds at the most deserving. Ranking by income matters a lot because it determines where projects will be funded and allowed to work.

Caravan at petrol staton copyBut there are still anomalies, particularly in large countries such as Brazil and South Africa, where regional disparities in income and life prospects are particularly marked. Even low income countries have wealthy people, and middle income countries have pockets of poverty. When I drove from the Western Cape into the Eastern Cape, in 2000, it was like entering a different country. The landscape became bleaker, towns more ramshackle and the mobile phone signal disappeared.

The OECD list classifies South Africa as “upper middle income”, so there are drawbacks to this method of deciding which countries do and don’t deserve donor support. Fortunately, South Africa is able to fund its own development projects and I was intrigued to experience a few years ago  an initiative that used the expertise and knowledge of white farmers to train black farmers in maize production. Maize has been a popular smallholder crop for many years, but on a small scale and with poor yields.

Hat lady with samples and Richard copyI got to know the white farmers, mostly Afrikaans-speaking, when I ran a course on plant clinics in Drankensville. I assumed that most of them belonged to the rich world, yet although they had undoubtedly benefited from apartheid-era privilege, there was no simple division between them and the black farmers they worked with. At a plant clinic, I watched in admiration as the Afrikaaners gave advice on maize problems in fluent Zulu. Many of the (white) people on the course had been given additional Zulu names, probably by domestic staff. I saw a genuine rapport between the two groups of farmers and an obvious mutual respect. It made me think hard about the way we decide who is poor and who is not.

Later I learned that some of the Afrikaaners had left school with minimal qualifications. They’d been in the army and then worked the land. Yes, they clearly had more material wealth, but to label them rich and the black farmers they worked with poor seemed wrong. This bleak division did little to emphasise the dignified way in which the white and black farmers treated each other.

Remo consultation copyAid agencies and international NGOs learnt long ago that pictures of suffering children attract funds, but they over-emphasise misery at the cost of hope for a better future. A poor country is a poor country, whichever way you look at it. But we should think carefully about how we describe their farmers, people who strive hard to do better. Their ambitions, perseverance and creativity deserve respect, hence the importance of choosing the right labels for the countries where they live.  Our blog stories will continue to feature the successes of farmers and entrepreneurs in poor countries. Publicising their achievements is the simplest way to enrich the lives of everyone.

Acknowledgements

I’m grateful for the support of the Agriculture Research Council of South Africa and for the support of my colleagues at the Plant Protection Research Institute.

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Wonder Crops April 9th, 2017 by

Innovation in agriculture is the key to progress, yet new ideas need to be carefully examined. This is particularly true for “if only” crops, where wondrous benefits could be realised, so we are told, if only more were produced for eager markets. It rarely turns out to be so simple.

Neem products Fortune company copyFrom the 1960s onwards the neem tree received a lot of attention from pest scientists who promoted the pesticide properties of naturally occurring compounds. Neem’s properties had been known across India for centuries, but were a source of wonderment to Western scientists, intrigued by the possibilities of natural alternatives to the highly toxic pesticides damned in Rachel Carson’s Silent Spring.

“If only” crops often promise increased incomes for farmers, with other benefits such as reduced pest management costs and health risks in the case of neem. Neem was promoted widely in West Africa as part of IPM (integrated pest management), though the most notable success I am aware of was an agroforestry scheme in Niger, where neem was used as windbreaks for annual crops. Neem was also promoted widely as a botanical insecticide in Central America in the 1990s, but the most lasting result of plantings seems to be attractive trees in public parks.

I did hear of a commercial scheme to harvest neem oil from neem plantations in Indonesia, driven by a reported US market price of US$50 per litre. But, like many other wonder crops, the hype didn’t match the reality. Neem products are sold widely in India, often with heavy government subsidies, but wider, international trade has yet to happen.

Promoting any new plant-based product for profit requires a complex series of coordinated steps, from getting farmers to grow enough plants to guarantee a steady supply of raw material, to having processing facilities that can produce the quality product needed by traders that are ready and willing to pay a fair price.

Patchouli possible copyAdd to this: trading regulations, alternative suppliers and fluctuating demand, and the barriers to success become daunting. The promotion of neem products has been a qualified success where farmers were already familiar with the plant. Creating enterprises based on a first-time crop is much more challenging, as I learnt last week in Rwanda. Patchouli is a small herbaceous plant whose leaves produce a pungent oil used in perfumery. Patchouli oil is also used in making incense and anyone who has visited India or passed by Hindu temples elsewhere is likely to have smelled its particularly intense and persistent aroma.

About 10 years ago an entrepreneur from Haiti, Pierre Léger, visited Rwanda and convinced the government to support a scheme to plant patchouli, a previously unknown crop. This was the wonder plant, according to the spiel, that would transform the lives of many poor farmers in Rwanda. Patchouli is well-suited to conditions in Rwanda, where aid agencies and the government were keen to support new enterprises, particularly those that promised high financial rewards. Add to this a global patchouli oil shortage and skyrocketing price at the time, and it’s easy to understand why a proposal to establish a patchouli industry in Rwanda received a sympathetic welcome. Rwanda already grew geraniums for essential oils, so this type of business was already familiar to some farmers.

Showing quinoa products copyToday, however, patchouli still languishes as an “if only” crop for Rwanda: if only more farmers had planted it; if only distilling facilities had been successfully established; if only investment from the government had been realised; and if only the original promoter had stayed the course necessary to establish a patchouli oil business. There are wonder crops that have succeeded, but usually because they were already grown by farmers and there was a semblance of a local industry that could be expanded when market conditions became favourable. It also helps to have committed private investors.

Quinoa is not an overnight success for Bolivia or Peru. Many people have worked for years to promote its nutritional benefits, efforts that are now being rewarded by sustained exports to North America and Europe. The quinoa was also supported for years at the exporting end in the Andes by researchers and entrepreneurs in Bolivia.

The overall picture of wonder crops is, however, of patchy success. Leucaena, a woody legume, was widely promoted by projects as a reliable solution to fodder shortages, yet it was plagued by a psyllid (a sucking insect) that followed the expansion of planting aroundPsyllids on leucaena 2 copythe world. Goji berries, a super-food grown mainly in north-west China, is a wonder crop that continues to do well. But success also encourages competitors, with increased quinoa and goji production in the US, for example.

The main lesson from the fates of many crops promoted as “the next big thing” for development is to exercise caution. It is tricky linking production to markets and finding reliable investors who will keep working on processing and marketing after donor dollars have disappeared. A committed community of researchers, processors, exporters, producers and policy-makers is essential. There is undoubtedly a place for wonder crops in creating new enterprises, but only if the assumptions and claims of the promoters are thoroughly scrutinised before taking the plunge.

Related blog stories

The quinoa boom in Bolivia has been years in the making: Quinoa, lost and found

Persistence helped to establish cardamom in Guatemala, as explained in A troubled crop.

A wonder crop can also be an insect, as we read in Kiss of death in the cactus garden

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The best knowledge is local and scientific April 2nd, 2017 by

Vea la versión en español a continuación.

Scientific knowledge is universal, but experienced agricultural scientists also bring their own, personal experience to bear on local problems.

Every year our guava tree loses all its fruit to fruit flies. A few weeks ago in Cochabamba my wife, Ana, sent me down to the agro-supply shop to get a special device, a pheromone trap, which lures fruit flies to their death using the scent of a sexual attractant. Insects use chemicals called pheromones to communicate with members of their own species. Some pheromones are emitted by a female fly that is ready to mate, but there are also alarm pheromones and aggregation pheromones (which you have seen in play, if you have ever noticed a large cluster of ladybird beetles clinging to a branch).

Ana was inspired to use the pheromone trap after having watched some training videos from Africa on the Access Agriculture website.

At the shop, the vendor said that “you get those traps at Proinpa.” I was a little surprised that she even knew of pheromone traps, but even more so that she knew of Proinpa: not everyone is aware of nearby agricultural research institutes.

At Proinpa, Luis Crespo, an entomologist, asked us why we wanted a pheromone trap. When Ana said for guava, Luis gave us a sad, knowing smile, as if to say “lost cause.”

“But the trap also works for fruit flies attacking peaches?” Ana added.

Luis said yes, but fruit flies prefer guava so much that he advises peach growers to cut down any guava trees, or the peaches will be ruined by flies emerging from the guavas.

Luis took us to his lab, where he piqued our interest in the food bait trap, as an alternative to the pheromone trap. He took a plastic soda-pop bottle and cut three small doors in it, to let in the fruit flies. “Fill the bottom of the bottle with a sweet liquid. The best one is fermented chicha.” Luis smiled at the thought that fruit flies liked the traditional maize beer. The flies are attracted to the liquid bait in the bottom of the bottle and drown.

The Mediterranean fruit fly (Ceratitis capitata) is native to Europe, but it is now widespread in South America. There are also fruit flies that are native to the Americas (Anastrepha spp.).

Unlike the pheromone trap, the food bait trap would catch both species of fruit fly, males and females, as well as houseflies, “and even wasps and bees,” Luis added with a touch of sadness. Entomologists like wasps, because they kill insect pests.

Luis Crespo with pheromone trapOn the other hand, Luis explained, when the food bait trap is full of dead insects, don’t pour it on the ground or the sugary liquid will attract fruit flies, and you will feed them instead of killing them.

Luis went on to explain that when wormy fruit falls to the ground, the fruit fly larvae pupate in the soil. So you have to gather up the fallen fruits immediately.

trampa de feromonasEven though Luis prefers food bait traps, which can be made entirely from local materials, he was kind enough to sell us a wax plug of imported pheromone bait as well. Luis took a wire and a pair of pliers and with a practiced hand, poked the wire through the bait and fashioned the wire into a little hook, so we could hang it inside the pheromone trap. Then he gave us the little triangular (delta) trap; the male, Mediterranean fruit flies will fly to the little plug of sex bait, but will be captured and die on the sticky floor of the trap.

Ana and I left pleased. We had three ideas: two kinds of traps and a renewed determination to clean up the fallen fruit. And if that didn’t work, we could always cut down our guava tree and plant an avocado tree in its place.

I remembered from earlier visits that Luis knew everything there was to know about potato pests, like weevils and moths. I was delighted to see that he was also an expert on fruit flies. Local knowledge and scientific knowledge are often seen as opposites, but at their best they are complimentary. A good agricultural scientist combines textbook knowledge with local experience to unravel the ties between peach trees and guava, the various species of flies, and the advantages of different traps for fruit flies.

Watch the videos

Integrated approach against fruit flies

Killing fruit flies with food baits

Collecting fallen fruit against fruit flies

Mass trapping of fruit flies

Weaver ants against fruit flies

EL MEJOR CONOCIMIENTO ES LOCAL Y CIENTÍFICO

por Jeff Bentley, 2 de abril del 2017

El conocimiento científico es universal, pero los experimentados científicos agrícolas también usan su propia experiencia para solucionar los problemas locales.

Cada año nuestro guayabero pierde toda su fruta a las moscas de la fruta. Hace unas semanas en Cochabamba mi esposa Ana me mandó a la tienda agropecuaria para comprar un aparato especial, una trampa de feromonas que llama a las moscas de fruta a su muerte, usando un atrayente sexual. Los insectos usan químicos llamados feromonas para comunicarse con miembros de su propia especie. Algunas feromonas son emitidas por una mosca hembra que está lista para la cópula, pero hay también feromonas de alarma y de agregación (las cuales usted tal vez ha visto en acción, si alguna vez se ha fijado en un gran grupo de mariquitas aferrándose a una rama).

Ana se inspiró a usar la trampa de feromonas después de ver algunos videos didácticos de Africa en el sitio web de Access Agriculture.

En la tienda, la vendedora dijo “se consiguen esas trampas en Proinpa.” Me sorprendió que ella supiera de las trampas de feromona, y más todavía que ella conocía a Proinpa: no todos se dan cuenta de los institutos de investigación agrícola en su zona.

En Proinpa, el Ing. Luis Crespo, entomólogo, nos preguntó por qué queríamos una trampa de feromona. Cuando Ana dijo para el guayabero, Luis nos dio una sonrisa triste, como decir “causa perdida.”

“¿Pero la trampa también funciona para moscas de la fruta que atacan a los durazneros?” Ana agregó.

Luis dijo que sí, pero que las moscas de la fruta prefieren tanto a la guayaba que él asesora a los productores de durazno a quitar todos sus guayaberos, caso contrario los duraznos serán arruinados por las moscas que emergen de las guayabas.

Luis nos llevó a su laboratorio, donde nos interesó en la trampa con atrayente alimenticio, como alternativa a la trampa de feromona. Tomó un envase plástico de refresco y cortó tres pequeñas puertas, para dejar entrar las moscas de la fruta. “Hay que llenar el fondo con cualquier líquido dulce. Lo mejor es la chicha fermentada.” Luis sonrió al pensar que a las moscas de la fruta les gusta la tradicional cerveza de maíz. Las moscas se atraen al anzuelo líquido al fondo de la botella y allí se ahogan.

La mosca mediterránea (Ceratitis capitata) es nativa a Europa, pero hoy en día está difundida por Sudamérica. Hay también moscas de la fruta nativas a las Américas (Anastrepha spp.).

A diferencia de la trampa de feromonas, la trampa alimenticia atraparía a ambas especies de mosca de la fruta, tanto machos como hembras, y moscas domésticas, “y hasta avispas y abejas,” Luis agregó con un toque de tristeza. A los entomólogos les gustan las avispas porque matan a las plagas insectiles.

Luis Crespo with pheromone trapPor otro lado, explicó Luis, cuando la trampa alimenticia está llena de insectos muertos, no botes el contenido al suelo porque el líquido dulce atraerá a las moscas de la fruta, y las alimentarás en vez de matarlas.

Luis siguió explicando que cuando la fruta agusanada cae, las moscas de la fruta se empupan en el suelo. Hay que eliminar toda la fruta caída inmediatamente.

trampa de feromonasA pesar de que Luis prefiere las trampas alimenticias, que se pueden hacer de materiales locales, amablemente nos vendió un tapón de cera, con feromonas. Luis tomó un alambre y alicate y con una mano experta, pasó el alambre a través del tapón y formó el alambre como ganchito, para que lo pudiéramos colgar dentro de la trampa de feromona. Luego nos dio una trampita triangular (trampa delta); los machos de la mosca mediterránea irán volando al corcho impregnado de olor a sexo, pero serán capturados y morirán en el piso pegajoso de la trampa.

Ana y yo nos fuimos contentos. Teníamos tres ideas: dos clases de trampas y una determinación renovada de limpiar la fruta caída. Y si eso no funcionaba, siempre podríamos despachar nuestra guayabera y plantar un palto (aguacate) en su lugar.

Me acordé de mis anteriores visitas que Luis lo sabía todo de las plagas de la papa, como gorgojos y polillas. Me encantó ver que también era experto en las moscas de la futa. El conocimiento local y el científico a menudo se ven como opuestos, pero en el mejor de los casos se complementan. Un buen científico agrícola combina el conocimiento de los textos con la experiencia local para entender la relación entre los durazneros y los guayaberos, las diferentes especies de moscas, y las ventajas de las diferentes trampas para las moscas de la fruta.

Vea los videos

Integrated approach against fruit flies

Killing fruit flies with food baits

Collecting fallen fruit against fruit flies

Mass trapping of fruit flies

Weaver ants against fruit flies

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