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THE APPLE APHID APHIS POMI (HOMOPTERA: APHIDIDAE) ON APPLE UNDER SUMMER CONDITIONS IN A CONTROLLED ENVIRONMENT CABINET1

Published online by Cambridge University Press:  31 May 2012

H. B. Specht
Affiliation:
Research Station, Canada Department of Agriculture, Kentville, Nova Scotia

Abstract

The apple aphid was reared on 1-year-old trees in a controlled environment cabinet with simulated mid-June through October 1968 daylengths and temperatures. Maximum rates of increase (ca. 2.7-fold per week) were observed during the first 5 weeks of the experiment and maximum populations were obtained in 7 weeks at the time the trees stopped growth when the diel photoperiod was 14.8 hr, and light/dark temperature was 20.5°/15.5 °C. The ratio of nymphs to adults increased from 5:1 to 10:1 from week 2 to week 8, followed by a rapid decline. At week 12 there were more adults than nymphs and the nymph:adult ratio remained 1:3 through the remainder of the experiment. Alate aphids appeared 2 weeks following infestation, increased very rapidly, ca. 6-fold per week, and maximum abundance was noted at the end of 6 weeks. Their numbers declined nearly as rapidly at ca. 0.35-fold per week and they were not seen after week 11. As the numbers of alate aphids decreased, apterous adults increased to week 12, remained constant to week 15, and slowly decreased in an environment of shorter daylengths and lower temperatures. The rate of apterous adult aphid increase was similar to the rate of accumulated degree days during the first 8 weeks and again in the 10- to 15-week period.Aphids were concentrated on the tree tops during the first 6 weeks of the experiment. A gradual migration followed and the aphids became dispersed over the trees with minor concentrations near the centers of the trees.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1972

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References

Cutright, C. R. 1930. Apple aphids in Ohio. Ohio agric. Exp. Stn Bull. 464.Google Scholar
Gambrell, F. L. and Glimer, R. M.. 1960. The influence of insecticide-fungicide spray programs on the growth of apple nursery trees. J. econ. Ent. 53: 717719.CrossRefGoogle Scholar
Lathrop, F. H. 1923. Influence of temperature and evaporation upon the development of Aphis pomi DeGeer. J. agric. Res. 23: 969987.Google Scholar
Oatman, E. R. and Legner, E. F.. 1961. Bionomics of the apple aphid, Aphis pomi, on young nonbearing apple trees. J. econ. Ent. 54: 10341037.CrossRefGoogle Scholar
Specht, H. B. 1970. The apple aphid, Aphis pomi (Homoptera: Aphididae), Population on apple under autumnal conditions in a controlled environment cabinet. Can. Ent. 102: 623627.CrossRefGoogle Scholar
Westigard, P. H. and Madsen, H. F.. 1964. Oviposition and egg dispersion of the apple aphid with observations on related mortailty factors. J. econ. Ent. 57: 597600.CrossRefGoogle Scholar
Westigard, P. H. and Madsen, H. F.. 1965. Studies on the bionomics of summer generations in California of the apple aphid, Aphis Pomi DeGeer (Homoptera: Aphididae). Can. Ent. 97: 11071114.CrossRefGoogle Scholar