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Entomophthora species infecting pea aphis
Author(s) -
WILDING N.
Publication year - 1975
Publication title -
transactions of the royal entomological society of london
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.865
H-Index - 81
eISSN - 1365-2311
pISSN - 0035-8894
DOI - 10.1111/j.1365-2311.1975.tb00566.x
Subject(s) - aphis , acyrthosiphon pisum , biology , conidium , host (biology) , crop , pisum , botany , agronomy , pest analysis , horticulture , veterinary medicine , ecology , aphid , aphididae , homoptera , medicine
SUMMARY1 Three species of Entomophthora infected the pea aphis, Acyrthosiphon pisum , on lucerne at Rothamsted Experimental Station, Harpenden, Hertfordshire, between 1967 and 1972 and caused a maximum mortality of 83% in July 1968. 2 E.thaxteriana , the commonest species, occurred each year and frequently infected aphids during cool weather in spring and autumn. E.aphidis and E.planchoniana were absent in some years and were most common during warm weather in midsummer. 3 The incidence of infection by the three species was correlated with the density of conidia in the air above the crop, host density and rainfall, but not with any other weather factor considered. 4 Infection at any time was much more closely related to environmental factors during the preceding 12 than 3 days. The regressions, however, were weak and the relative importance of different environmental factors for the spread of infection can probably only be determined under controlled conditions in the laboratory.