Environmental biology of Endria inimica (Say) (Homoptera:Homoptera:Cicadellidae) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/wh246v44z

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  • The leafhopper vector, Endria inimica (Say), of wheat striate mosaic virus is a bivoltine insect which overwinters as second generation eggs in a state of diapause. Under experimental conditions, egg diapause resulted from rearing females under short days (12L:12D) and diapause was averted by rearing females under long days (15L:9D). The effect of rearing females under short days was partially altered by a mean daily temperature of 32.4°C. Short- and long-day females oviposited the majority of their eggs in dead vegetative material on the soil surface. Eggs in diapause were not induced to develop by subjecting them to light and temperature conditions favorable for continuous development. Diapause was terminated more rapidly by exposing the eggs to 0°C than to 8°C. Sixty-six percent of the short-day females and 52% of the long-day females tested were inoculative after a two-day acquisition feed on durum wheat (cv. Ramsey) plants infected with wheat striate mosaic virus. Frequency of virus transmission was not affected by the photoperiodic regimen under which the females were reared. Short-day females transmitted the virus as frequently as long-day females. The latent period was 13.21 days in the short-day females and 14.85 days in the long-day females. The mean number of plants infected was 18.46 plants by short-day females and 21.15 plants by long-day females. The number of plants infected per insect day was 0.48 plants by short-day females and 0.50 plants by longday females.
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