Sunday, February 26, 2017

Onions stop tomato aphids attack.

In cutting down pesticide application and the accruing costs in production, one farmer succeeded in vending off the pests by growing onions around his greenhouse tomatoes in the last season. Lari Sub-county farmer Nathan Kimeu was implementing an idea he learnt from the Internet that onions’ smell can repel some crop pests like aphids. “I found out that some crops are good biological controls of pests, which attack common commercial foods such as chillies, capsicum, Kales, cabbage, tomatoes, among others. I also leant that greenhouse rotation with non-victim crops like coriander can break the lifecycle of the enemies,” he said. In May 2016, he grew onions in the periphery of his 8m by 30m greenhouse, which had tomatoes as the main crop. Indeed on close scrutiny of the tomatoes on the outermost lanes- those neighbouring the onion soldiers- were free from the aphid attack for the entire season. Aphids are pest that drill into the leaves of crops. They suck the sap with the nutrients, causing severe produce losses due to unhealthy crops.The leaves curl to the because of the heavy infestation from the underside. This condition reduces the surface area for photosynthesis, the food making process in plants.Because of the extraction of the nutrient-rich sap, some leaves turn yellow due to malnourishment, which also reduces photosynthesis resulting from the absence of the green pigment. This negatively affects the overall production.Application of chemicals in the control of the pests is not only expensive as is required interval interventions. But the onions are a one-time cost that defends the crop until the end of the season and still be sold alongside the main crop, Kimeu said. “Organic farming is gaining fame as food-related diseases rise. I am starting small and with such positive results, I hope to go organic to meet the small but healthy eating market,” he said. The Kiambu County farmer intends to grow the ‘soldiers’ along the rows of the tomatoes in 2017 to boost the defense while reducing the cost of production. Although he cannot quantify the money saved from the biological control of the pests, the farmer says his main pesticides application was specific on other pest such as white flies and mites.source

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