Proceedings of the South & East African combined agricultural, cotton, entomological and mycological conference held at Nairobi, August, 1926

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Monograph

Identifikator:: 1738588467

URN:: urn:nbn:de:zbw-retromon-115043

Document type:: Monograph

Title:: Proceedings of the South & East African combined agricultural, cotton, entomological and mycological conference held at Nairobi, August, 1926

Place of publication:: Nairobi

Publisher:: East African Standard

Year of publication:: 1926

Scope:: VI, 337 Seiten; Ill.

Digitisation:: 2020

Collection:: Economics Books

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Chapter

Document type:: Monograph

Structure type:: Chapter

Title:: Part IV. Etomology & Mycology

Collection:: Economics Books

PARTIV. touch it again. Methods of wholesale destruction, such as the use of Calcium Cyanide, or hot water, would be too costly in cases of serious infestation, as the numbers of individual nests are very large—in places there may be as many as one per square yard. Furthermore it is only after rain when the soil is damp that the queens and the immature stages will be found near the surface; in dry weather the nests may be at’a depth of as much as a foot. Consequently the number of days on which such destruction could be effectively practised is limited. However, when a fresh outbreak of mealy-bug in conjunction with Pheidole is observed, it would be well worth while to attempt total eradication of the ants while there are still comparatively few nests. It is consequently necessary, in the majority of cases, to fall back on the use of repellents, and though fair results have been obtained from the use of a high boiling point creosote oil, it is unsatisfactory in many ways, the method of application being slow and somewhat difficult for unskilled labour, while careless use of 1t may result in damage at any rate to young trees. We have written to America for a sample of a substance used as a repellent against Gipsy moth caterpillars (3, p. 133), the active principle of which is also tar oil. It is said that this ean be applied direct to the bark without injury, and remains eflicient with but little attention for two years. Should it prove to be effective against Pheidole and reasonably cheap, the mealy-bug problem should be temporarily solved; but a permanent preventative will only be found when and if, by a detailed knowledge of the bionomics of this ant, the means can be found for its complete destruction. In conclusion, I wish to express my indebtedness to all the scientific officers of the Department of Agriculture for their invaluable help, more especially to Messrs. Anderson, Tox, Trench, and Wilkinson; and to numerous Coffee Planters, particularly to Capt K. E. Dormer, on whose plantation a large number of experiments have been conducted. REFERENCES. (1) Axperson, T. J. Report of the Entomologist. Ann. Rept., Dept. Agric., Kenya Colony, 1924. 9) BorprxN, A. D. Control of the Common Mealy-bug on Citrus in California. U.S: Dept. Agri. Bull, No. 1309, 1923. 3) Burcress, A. F. aNp GrirFiN, E. L.A New Tree Banding Material for the Control of the Gipsy Moth. = Journ. Fcon. Ent. Vol. X., No. 1, pp. 181—135. 1917. ; (4) Fousom, J. W. Entomology with Reference to its Biological and Economic Aspects. Philadelphia, 1913. (5) Kirgpatrick, T. W. The Egyptian Cotton Seed Bug. Min. Agric., Egypt, Bull. No. 35. 1923. (6) Kirgparrick, T. W. The Buff-backed Egret as a Factor in Egyptian Agriculture. Min. Agric. Egypt, Bull. No. 56, 1925. (7) LOCKHEAD, W. Class Book of Feconomic Entomology. Philadelphia, 1919. (8) Smirm, H. S. axp ArmiTace, H. M. Biological Control of Mealy-bugs in California. Monthly Bull. Dept. Agric., California IX. 4, pp. 104—158. 1920. ‘'9) WoaruM, R. S. ano Neurs, J. D. The Common Mealy-bug and its Control in California. U.S. Dept. Agric. Bull No. 862. 1017. 194

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