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The induction of leaf‐roll galls by the apple aphids Dysaphis devecta and D. plantaginea
Author(s) -
FORREST J. M. S.,
DIXON A. F. G.
Publication year - 1975
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.1744-7348.1975.tb01643.x
Subject(s) - biology , aphid , phloem , seedling , botany , aphididae , lamina , host (biology) , homoptera , pest analysis , ecology
SUMMARY Dysaphis devecta causes the leaves of its host plant to roll laterally whereas D. plantaginea causes them to roll longitudinally. Both species of aphid are phloem feeders. D. devecta prefers to feed on the smaller veins in the lamina whereas D.plantaginea chooses the midrib. However, groups of D. devecta or D. plantaginea confined to the stem of an apple seedling induced young leaves several centimetres away to develop leaf rolls characteristic of each species. A single larva of D. devecta or D. plantaginea can induce a leaf‐roll or a stem‐bend on an apple seedling within 24 h. It is suggested that characteristic abnormalities in leaves attacked by D. devecta and D. plantaginea are caused by specific substances in the saliva of each aphid.