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H. Roy ; J. Pell ; S. Clark ; P. Alderson | 1998The foraging behavior of starved and nonstarved second and fourth instar Coccinella septempunctata larvae on dead Acyrthosiphon pisum aphids, either infected with the entomopathogenic fungus Erynia neoaphidis (sporulating) or uninfected, was exa[...]
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L. Morgan ; L. Boddy ; S. Clark ; N. Wilding | 1995The influence of temperature on the germination of Erynia neoaphidis primary and secondary conidia was investigated. The rate of germination of both the primary and the secondary conidia was temperature-dependent with an optimum temperature betw[...]
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J. Mann ; G. Tatchell ; M. Dupuch ; R. Harrington ; S. Clark ; H. Mccartney | 1995The effect of wind and rain on initiation of dispersal and subsequent distances moved by apterous Sitobion avenae was quantified in five laboratory experiments. Wind duration and type (steady and gusting), rain duration and intensity, and a comb[...]
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P. Brobyn ; N. Wilding ; S. Clark | 1985
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G. Howling ; R. Harrington ; S. Clark ; J. Bale | 1993The Rothamsted Insect Survey has kept records of aerial aphid activity using suction traps since 1965. Previous work has shown that, for certain species, there is a linear relationship between the date of first record in the trap each year and t[...]
