Wednesday, 20 November 2002

This presentation is part of : Display Presentations, Subsection Fa. Host Plant Resistance

Effects of maysin on Old World corn earworm, Helicoverpa armigera, (Lepidoptera: Noctuidae) in comparison to New World corn earworm, H. zea

Brian G. Rector, USDA-ARS, Crop Genetics and Breeding Research Unit, P.O. Box 748, Tifton, GA and Ge-Mei Liang, Chinese Academy of Agricultural Sciences, Institute of Plant Protection, West Yuan Ming Yuan Rd. #2, Beijing, China.

Larvae of the Old World corn earworm (Helicoverpa armigera) and New World corn earworm (Helicoverpa zea) were reared on artificial diets supplemented with lyophilized maize silks that either contained or lacked maysin, a flavone glycoside. Neonate larvae were reared on the diets and weighed after 7 days. After weighing, larvae were returned to the diets to complete development. Percent pupation and percent emergence were recorded. Maysin, which was already known to reduce larval growth, pupation, and emergence in H. zea, exhibited similar effects on H. armigera in this experiment. The results suggest that maysin-based host-plant resistance in maize could be effective against both of these closely-related insect pests.

Species 1: Lepidoptera Noctuidae Helicoverpa armigera (Old World corn earworm)
Species 2: Lepidoptera Noctuidae Helicoverpa zea (corn earworm, cotton bollworm)
Keywords: host plant resistance, maize

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