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Controlling cucumber beetles organically
Date:2/17/2009

FRANKFORT, KYAs the popularity of organic produce increases with consumers, growers need more options to manage pests naturally.

John D. Sedlacek and Gary R. Cline (retired) of the Land Grant Program at Kentucky State University led a research project designed to investigate options for reducing the presence of cucumber beetles. These pests damage crops by eating the roots, shoots, and flowers, and transmit the bacterial wilt pathogen. The study, published in the American Society of Horticultural Science journal HortTechnology, compares several practices in watermelon and muskmelon crops.

In 2002, watermelon was grown on black plastic mulch with the exception of one group, which was grown on Al-plastic, an aluminum coated plastic mulch previously linked to reduced cucumber beetle densities on squash. Another plot of watermelons was planted with companion plants thought to repel cucumber beetles. A third group was planted with a different set of companion plants that seem to attract insects that prey on cucumber beetles. Sticky traps stationed among the plants collected cucumber beetles, which were counted and removed on a weekly basis. The watermelon yields were not adversely affected by the Al-plastic nor by the companion plants.

More beetles were collected in the control and Al-plastic groups than the companion plant groups. Similar numbers of beetles were trapped in repellent plant groups and beneficial insect-attracting plant groups, suggesting these plants may be more valuable as a physical barrier to the beetles' movement than for their attractive or repellent properties.

In 2003, the study was replicated using muskmelons. Al-plastic was included again, but the companion plant groups were combined to include beetle-repelling radishes and predator-insect-attracting buckwheat. Other treatments included use of rowcovers and the organic insecticide PyGanic. The separate Al-plastic and companion plant groups increase
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Contact: Michael W. Neff
mwneff@ashs.org
703-836-4606
American Society for Horticultural Science
Source:Eurekalert

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