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A preliminary Note on Helopeltis spp. damaging Cashew in Tanganyika Territory

Published online by Cambridge University Press:  10 July 2009

G. Swaine
G. Swaine
Affiliation:
Entomologist, Department of Agriculture, Arusha, Tanganyika.
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Extract

Cashew, Anacardium occidentale, an increasingly important cash crop in the coastal region of Tanganyika, is damaged by two widely distributed species of Helopeltis, H. anacardii Miller and Helopeltis sp.

At Bagamoyo, in June 1955, the period from egg to adult for H. anacardii occupied 35·9 days; that for Helopeltis sp. occupied 39·2 days.

Damage is caused to the leaves, shoots, buds, young fruits and to the cashew apple. Damage in a young tree is more marked than that in an old tree and may result in its being malformed or stunted.

The build-up of Helopeltis populations on cashew follows the main growth period of the crop which begins shortly after the end of the main rains in May. The insects are readily found from July to October-November, when the crop matures.

Application of a 0·5 per cent, γ BHC dust and a 5 per cent. DDT dust to two-year-old trees increased the amount of crop but the increase was not economic owing to the fact that the trees were coming into bearing for the first time. Cross-infestation from untreated plots may also have reduced the effectiveness of the treatments.

Three or four applications by a knapsack-type power duster of 0·5 per cent. γ BHC dust at 15-day intervals previous to flowering of the main crop gave promise of successful control in the field.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 50 , Issue 1 , March 1959 , pp. 171 - 181
Copyright
Copyright © Cambridge University Press 1959

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References

Crowdy, S. H. & Elias, R. S. (1956). Cacao diseases.—Outlook on Agric. 1 no. 2 pp. 64–69.CrossRefGoogle Scholar
Golding, F. D. (1945). Notes on Helopeltis sanguineus, Popp., on cotton in Nigeria.—Bull. ent. Res. 36 pp. 75–78.Google Scholar
Kirkpatrick, T. W. (1941). Helopeltis (Hem. Capsidae) on cinchona.—Bull. ent. Res. 32 pp. 103–110.Google Scholar
Miller, N. C. E. (1954). Two new species of Miridae (Hemiptera-Heteroptera).—Bull. ent. Res. 45 pp. 703–705.Google Scholar
Patterson, W. H. (1914). Report of the Entomologist.—Rep. agric. Dep. Gold Cst 1913 pp. 18–27.Google Scholar
Swaine, G. (1956). Annual report of the Entomologist, Morogoro, for the year 1955.—Rep. Dep. Agric. Tanganyika 1955 pt. 2 pp. 38–42.Google Scholar