Crop sprayer

Most of the corn grown in the U.S. is genetically modified and sprayed with the herbicide glyphosate.

Africa: Push-Pull technology halts fall armyworm rampage – without GM



Recently GMWatch reported on attempts by the GMO lobby to persuade African countries to accept GM Bt maize to fight the fall armyworm pest, which is spreading across the continent and ravaging maize crops.

But the lobbyists omitted to mention that GM Bt insecticidal maize targeting the fall armyworm has already failed in different regions due to pests becoming resistant to the GM Bt toxins in the crop.

The lobbyists also ignored the fact that agroecological methods, such as attracting ants to feed on armyworm eggs, are proving successful.

Now we’ve been alerted to another agroecological and non-GMO method that is working well in Africa as a defence against the fall armyworm.

The method, a climate-adapted version of Push-Pull, is being spearheaded by the International Centre of Insect Physiology and Ecology (icipe), a multinational government-funded organisation that supports poverty alleviation and food security.

A recent study based in East Africa shows that the method is effective in controlling the fall armyworm, providing an accessible, environmentally friendly, and cost-effective strategy for management of the pest.

“These findings represent the first documented report of a readily available technology that can be immediately deployed in different parts of Africa to efficiently manage the fall armyworm.”

What is Push-Pull?

Push-Pull is an innovative companion cropping technology developed over the past 20 years by icipe in close collaboration with national partners in East Africa and Rothamsted Research, United Kingdom. It is modelled on the African smallholder farming system of multiple cropping.

Originally developed for the control of stemborers, the key pests of cereal crops across most of Africa, and parasitic Striga weeds, Push-Pull involves intercropping cereal crops with insect repellent legumes in the Desmodium genus, and planting an attractive forage plant such as Napier grass as a border around this intercrop.

The intercrop emits a blend of compounds that repel (“push”) away stemborer moths, while the border plants emit chemicals that are attractive to (“pull”) the pests.

Armyworm infestation over 80% lower in Push-Pull fields

Prof Zeyaur Khan, Push-Pull leader at icipe and a co-author of the new study, said,

“Over the past several months we received information from Push-Pull farmers that their fields were free of fall armyworm infestation while neighbouring monocrop plots were being ravaged by the pest. Therefore, we evaluated the climate-adapted version of the technology as a potential management tool for fall armyworm in Kenya, Uganda and Tanzania.”

The study revealed fall armyworm infestation to be more than 80% lower in plots where the climate-adapted Push-Pull was being used, with associated increases in grain yields, in comparison to monocrop plots.

The findings were supported by farmers’ own observations of significantly reduced presence of fall armyworm in Push-Pull plots.