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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Document type:: Monograph

Structure type:: Chapter

Title:: Part IV. Etomology & Mycology

Collection:: Economics Books

PART IV. 5 The CHAIRMAN (Mr. Fuller), on behalf of the other delegates in the Section, thanked Mr. Kirkpatrick for, and congratulated him on, his instructive paper. He was impressed by the remarks in regard to the control of the ant, as in South Africa they were rapidly coming to the conclusion that the problem of the ant is the one which should be tackled. In regard to predatory enemies, he was surprised that no mention was made of the Cetonid. He had always thought that further information in regard to this insect might produce good results. He also noticed that no mention had been made of Termites in connection with the destruction of coffee trees, and would be glad to know if such destruction had been observed. Mr. TRENCH stated that in Kenya, Termites do attack Grevillea robusta in dry districts, but he had never seen them attack live coffee plants. Mr. ANDERSON stated that on coffee plantations, where Grevillea robusta and coffee grow together, the Grevillea is attacked but the coffee very rarely. Mr. KIRKPATRICK, in reply to Mr. Hargreaves, stated that he had not so far taken any soil samples of the areas infested with Mealy Bug but that he thought that there might be some correlation between soil and the presence of the ant; and he hoped that the Chemist would be able to help in investigating the matter. Mr. HARDENBERG had recently been looking up records and comparing lists of food plants of various Coccinellide, and had found many wrong determinations; and he would ask all Entomologists to collect data and material in respect of this particular family, in both the adult and immature stages, and to forward these to him. He had found Coccinellids poorly represented in collections, particularly the smaller varieties. In regard to the relation between Coccinellids and Pheidole ants, it had been said that the latter prey on the former; on the other hand, Mr. Van der Merwe is reported to have found the larvee of the former living in the nests of the latter. This appeared to be strange, as from these conflicting reports they seemed in some way to prey on one another. Mr. KIRKPATRICK, in reply to Mr. Hargreaves, stated that he had tried tanglefoot and that it was effective to some extent, as far as the ant was concerned, but that many beneficial ladybirds were trapped; also, it rapidly got coated over with dust and thus became useless. In regard to baits, he had tried many but had invariably found that, after a few of the ants had been killed, the remainder were too wary to take the bait. The CHAIRMAN (Mr. Fuller) agreed with Mr. Kirkpatrick's experience—that no success had so far attended the attempts to control this ant by baits or traps. Mr. WILKINSON, in reply to Mr. Fuller, stated that there was no doubt that the spray used in Kenya was very effective against the Mealy Bug, and in cases where the clusters of the Mealy Bug were not thick it undoubtedly killed most of them but it had, at the same time, the effect of killing the predatory insects, and, in the long run, possibly did more harm than good. Mr. TRENCH stated that they had found that fields infested with Mealy Bug and cleared up by spraying became worse durine the next 19:

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