1. RE: Aphids!! PLEASE HELP!!


Pickett's 2017 ARS Sterling Hendricks Memorial Lecture

Suggests Plants Deliver Their Own Pest Controls
by USDA Agricultural Research Service
August 29, 2017

Future food crops will need to make and deliver their own natural pest controls, suggested internationally acclaimed chemist John A. Pickett during his 2017 Agricultural Research Service (ARS) Sterling B. Hendricks Memorial Lecture.

The Lecture was presented at the American Chemical Society Fall Meeting in Washington D.C.

Pickett has pioneered the discovery of how pheromones and other signaling chemicals govern communication between insects and manage interactions between insects and their plant and animal hosts. These chemicals, called semiochemicals, influence the behavior of other organisms.

He was the first to chemically characterize mosquito, sandfly and aphid sex pheromones. Pickett later proved that when insect pheromones and plant-derived semiochemicals are used together in traps, their ability to attract insect pests is multiplied beyond that of just adding each together.

Such work is forefront in the contemporary movement away from wide spectrum pesticides toward more precise biobased controls that target specific pests. The impact of Pickett's research reaches beyond scientific and agricultural communities, providing benefits to society and the general environment.

This is particularly exemplified by Pickett's work in Africa where he helped develop a "push-pull" companion cropping system that is overcoming some of the major limitations on grain production. Staple and cash cereal crop yields in sub-Saharan Africa face severe constrains from weeds and pests.

By intercropping maize (corn) with a repellent plant and an attractive trap plant—both delivering semiochemicals repelling pests and attracting beneficial insects—farmers are overcoming limitations without harming the ecology. More than 40,000 farmers in West Kenya have already adapted and are benefitting from this practice.

Pickett is currently the Michael Elliott Distinguished Research Fellow at Rothamsted Research in Harpenden, England, the longest running agricultural research station in the world. Among his awards are Fellow of the Royal Society, the Wolf Foundation, Prize in Agriculture, Foreign Associate of the U.S. National Academy of Sciences and a Commander of the Order of the British Empire (CBE) for his services to biological chemistry.

ARS established the Lectureship in 1981 to honor the memory of a remarkable scientist Sterling B. Hendricks and to recognize scientists for outstanding contributions to the chemical science of agriculture. To learn more about the Sterling B. Hendricks Lecture, see

For more information contact Kim Kaplan, ARS Office of Communications. The Agricultural Research Service is the U.S. Department of Agriculture's chief scientific in-house research agency. Daily, ARS focuses on solutions to agricultural problems affecting America. Each dollar invested in agricultural research results in $20 of economic impact.

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