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

ENCLOSURE TO PART 1V. A NEW BOLL WORM. Mr. Hargreaves related the occurrence in Uganda of a new boll- worm, Argyroploce sp.* APHIDS AND JASSIDS. The Chairman read notest by Mr. Haines. Mr. HARGREAVES stated that in Uganda the Aphids was perhaps the most serious pest on cotton; certainly the accumulated effect appeared to be greater than that of anv other insect. Mr. RITCHIE suggested that the control of Aphids and Jassids by fungi might be further investigated; a fungus was the most potent controlling factor of Aphis in Tanganyika, and he instanced the success of a fungus as the controlling factor of West Indian cane hopper, Delphax sacchernora. This suggestion was accepted by the Section. Mr. HARDENBERG was experimenting with nicotine dust and Bordeaux mixture in the control of Jassids. OCCURRENCE OF MAJOR PESTS. The Chairman read notes§ by Mr. Haines. The Section accepted the position as put forward by Mr. Haines, and agreed :—- That a wider survey was necessary before any definite information could be supplied. COTTON STAINER (DYSDERCUS SPP.) The Chairman read the following paper (referred to in Agenda as T.C. (C)Cot.15), which had been submitted by the Southern Rhodesian Government : — Two species of varieties of Dysdercus, namely D. intermedius, Dist. and D. nigrofasciatus, Stal. are extremely prevalent in their season in Southern Rhodesian cotton fields. It is clearly desirable that the relation of these abundant insects to the cotton crop should thoroughly be understood. The economic status of an insect in any particular area must obviously be determined by local investigation, but experience in other areas is helpful in indicating a direction to such local research. In consulting available literature, some difference of opinion in respect to these insects in different cotton growing countries is apparent. It is desired to make it clear at the outset that the present writer is wholly concerned in seeking information and has nothing in the way of experimental results to impart. His object is merely to place certain difficulties before the Conference and if possible to obtain an answer to one or two questions. The genus Dysdercus appears to be of almost universal occurrence in the tropics and is apparently represented by one or other of its species in practically all cotton growing countries. The different species seem to have quite similar habits and it appears permissible to deal with the genus as a unit. See also page 171. For text of these notes see page 173. - For text of these notes see page 172. 238

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