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 1V. The CHAIRMAN (Mr. Fuller) observed that such work must be done by a mycologist. Mr. MILLIGAN would like to see everything tried which would help in any way to control plant diseases. If they knew that someone was working on these problems they would be more satisfied than they were at present. JASSIDS.* Mr. PARNELL made the following statement: — Jassid is a very important factor in cotton growing in the low veld of the Union of South Africa, and the production of a resistant type is one of the first objects of the Barberton Station. Cage experiments have proved that the Jassid (Empoascus Sp.) is directly concerned with the pathological condition under review, and is probably entirely responsible without the intervention of any disease organism. Speaking generally, the intensity of the Jassid attack on any one variety depends largely on the health and stage of development of the plant, it being least on a strongly growing immature crop. Various plant-foods appear to affect susceptibility only through their effect on the growing condition of the plant. The susceptibility of different varieties varies enormously, and the results of the last two seasons show that selection for Jassid-resistance is a most promising line of work. A decidedly resistant strain, possessing other good qualities, has already been obtained, and will be multiplied, provisionally, on about 200 acres in the coming season. The nature of the resistance of certain varieties is undoubtedly complicated. Some degree of tolerance exists, also some attribute which discourages the breeding of the pest. In the latter category hairiness, both as regards density and length of hairs, has been shown to be an important factor The CHAIRMAN (Mr. Fuller) agreed with the opinion expressed by Mr. Parnell. PINK BOLL WORM. ~~ The CHAIRMAN (Mr. Fuller) read repliest drafted by the Entomological Section in answer to the questions asked by the Empire Cotton Growing Corporation. These were accepted, without discussion. ~The Chairman reviewed the items of interest in connection with Pink Boll Worm, which had come under discussion by the Entomological Section. A resolution drafted by the Entomological Section in regard to a map of the distribution of the Pink Boll worm in Africa was submitted. It was approved with the suggestion that a note be inserted in the record to the effect that other arrangements should be made for the preparation of a map in the event of the Union (Government being unable to undertake it. See also page 173 See page 174. See page 176. 181

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