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- Author or Editor: Kenneth S. Rymal x
- Journal of the American Society for Horticultural Science x
Compounds active as feeding stimulants for cowpea curculio (Chalcodermus aeneus Boheman) were quantitatively determined by laboratory bioassays in pods of 5 cultivars of southernpeas (Vigna unguiculata (L.) Walpers). Feeding response was tested on intact sections of fresh pods and on filter paper wrapped plugs of agar and water-extracts of hulls with seeds removed. Water extracts were partitioned with ether and the tests of the activity of both fractions indicated that the active compounds were lipid in nature. Active compounds extracted from a susceptible cultivar were added to the extract of a resistant cultivar and feeding response was increased nearly 10 fold.
Quantitative and qualitative differences in fatty acid composition between resistant and susceptible cultivars were shown by gas chromatography. The amounts of eicosenoic acid were directly related to curculio feeding response to the cultivars.