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THE INFLUENCE OF HEAT ON SOME APHIDS
Author(s) -
BROADBENT L.,
HOLLINGS M.
Publication year - 1951
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1951.tb07829.x
Subject(s) - biology , myzus persicae , instar , aphid , horticulture , zoology , aphididae , botany , pest analysis , larva , homoptera
The thermal death‐points of five species of aphids removed from their host plants lay between 38 and 41°C., when tested for 1 hr. at 60% r.h . Many aphids alive after 1 hr. at high temperatures died within the next day; no Myzus persicae recovered and reproduced after 1 hr. above 37.5°C. Third and fourth instars and adult apterae withstood heat better than first and second instars and alatae. More aphids died at 90% r.h . than at 60% r.h , and more at 60% than at 30% r.h . Aphids kept at 15% r.h . for 4 hr. before being heated showed a higher mortality than those kept at 95% r.h . Aphids on plants withstood temperatures higher than their thermal death‐point off the plant. Presumably aphids can continue to cool themselves by evaporation while feeding; also lower temperatures on the surface of transpiring plant tissues will aid survival.