Monday, 18 November 2002

This presentation is part of : Display Presentations, Subsection Cc. Insect Vectors in Relation to Plant Disease

Evaluation of the carrot's resistance to aster yellows and the efficacy of insecticides to aster leafhoppers

Liyang Zhou1, Edward Grafius1, Beth Bishop1, Walter Pett1, and Mary Hausbeck2. (1) Michigan State University, Department of Entomology, 243 Natural Science Building, East Lansing, MI, (2) Michigan State University, Department of Plant Pathology, 140 Plant Pathology Building, East Lansing, MI

The carrot trial of random block design of 9 varieties with 4 replications was set up in MSU Muck farm, 2002. The trial was kept unspraying all the season. In June, cages were set up in each variety and 50 aster leafhoppers collected from surrounding fields were put into each cage. The cages were moved 3d later. In July, a repitition will be made. But the aster leafhoppers from rearing cages in the greenhouse on diseased asters will be transferred into field cages. In late season, both aster yellows in the cage covered and uncoverd area of each varitey will be evaluated.

Another similar trial was also set up for insecticide tests. 4 insecticides, Cyfluthrin, Thiamethoxam, Esfenvalerate and Imidacloprid were used to treat the plots of 2 varieties with 4 replications. 4 sprays of each insecticide were made in June and July. Cages were set up on the second day of spray and aster leafhoppers were put into the cage. The survival rate of aster leafhopper in each cage was recorded and aster yellows will be evaluated before harvest.

Some results of feeding behavior study (using EPG) of aster leafhopper on insecticide treated carrots may also be included.

Species 1: Homoptera Cicadellidae Macrosteles quadrilineatus (aster leafhopper, six-spotted leafhopper)
Keywords: insect vector, vegetable disease

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