Influence of Flight and Colour Morph on Susceptibility of Sitobion avenae to Infection by Erynia neoaphidis

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Abstract
The influence of clone and morph on the infection of Sitobion avenae with Erynia neoaphidis was examined in laboratory assays. The LC 50 -values were low; green alates: 0.8-1.8, green apterae: 2.9, brown alates: 1.5 and brown apterae: 2.6-3.6 conidia mm -2 . Within each of the two inoculation occasions, alates of both clones were significantly more susceptible than apterae, while there was no difference between the two clones. The LT 50 -values at 18°C varied between 6.4 and 7.5 days and there was no significant difference in LT 50 -values between either the two different coloured clones or between alates and apterae.