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Some aspects of insecticidal and biological control of the woolly apple aphid, Eriosoma lanigerum (Hsm.) in Rhodesia

Published online by Cambridge University Press:  10 July 2009

A. J. M. Carnegie
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Extract

In insecticide trials in 1962–63 in Rhodesia against woolly apple aphid, Eriosoma lanigerum (Hsm.), no appreciable control was achieved by applying ½ fluid oz. of a 40 per cent, emulsifiable concentrate of dimethoate per tree at 2- to 3-week intervals for 16 weeks in any of the following ways: painted directly on the lower trunk; absorbed in a cotton-wool band applied to the trunk, after being diluted 1:3 in water; applied to a furrow around the stem after being diluted in four gallons of water; injected into the soil with a nematicide injector after being diluted 1:4 in water.

A foliage spray of DDT (0·195% active ingredient) had a gradual controlling effect on the aphid and caused no upsurge such as might have occurred had the parasitic activities of Aphelinus mali (Hald.) been suppressed.

Activity of the ant Pheidole megacephala (F.) was immediately halted on trees sprayed with DDT and was suppressed on trees the trunks of which were painted with dimethoate and on those banded with a dimethoate-soaked barrier.

Over a fourteen-month period, the numbers of living aphid colonies fluctuated before decreasing at the same time as the activity of A. mali intensified.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 56 , Issue 2 , December 1965 , pp. 269 - 274
Copyright
Copyright © Cambridge University Press 1965

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References

Carnegie, A. J. M. (1963). Woolly aphid of apple, Eriosoma lanigerum (Hsm.), and its control in Southern Rhodesia.—Bull. ent. Res. 53 pp. 609–619.Google Scholar
Georgala, M. B. (1953). The woolly aphis of apple and its control.—Fmg in S. Afr. 28 pp. 21–22, 27.Google Scholar
Pielou, D. P. (1961). The control of the apple aphid on dwarf apple trees with bark applications of dimethoate.—Canad. J. Pl. Sci. 41 pp. 407–412.Google Scholar
Pielou, D. P. (1962). Note on the control of the apple aphid by new systemic insecticides translocated from bark to foliage.—Canad. J. Pl. Sci. 42 pp. 374–377.CrossRefGoogle Scholar