Patterns of primary spore discharge of Entomophthora spp from the blue green aphid,Acyrthosiphon kondoi |
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Authors: | RJ Milner |
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Institution: | CSIRO, Division of Entomology, Canberra, A.C.T. 2601, Australia |
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Abstract: | Experiments were conducted to study the effects of time, temperature, and light regime on primary spore formation at 100% RH for the three major pathogens of Acyrothosiphon kondoi. Only small differences were detected between the continuous light and continuous dark regimes. Entomophthora obscura produced between 6 and 10 × 103 primary spores mostly during the first 48 hr. Total primary spore production was similar at the five temperatures tested from 5° to 25°C. Entomophthora planchoniana produced large numbers of primary spores (about 5 × 104 per aphid) only at temperatures between 10° and 20°C. The majority of primary spores were formed during the first 24 hr. Primary spore production with Entomophthora nr. exitialis ranged from about 105 per aphid at 5° and 10°C to 3 or 4 × 105 at 15° to 25°C, with most spores being formed during the first 48 hr. It is suggested that rainfall is more likely to be important for transmission of E. obscura and E. nr. exitialis than for transmission of E. planchoniana, and that E. obscura is likely to be the most important pathogen during cool or cold weather. |
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Keywords: | aphid blue green spore discharge |
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