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. (b) That, in order that the lists may be uniform, they should be compiled in the following form :— (a) Name, (b) Reference to original description, (c¢) Distribu- tion, (d) Food plants and alternative hosts, (e) Status as a. pest, (f) Predators and parasites, (g) Further notes. (c. That the Imperial Bureau of Entomology and Imperial Bureau of Mycology in London should be approached with a view to the compilation, classification and publication of the lists by them. 13. That each Department of Agriculture of South and Hast African Territories should undertake to notify, without delay, every other such Department of the presence of a new disease or pest considered to be of economic importance. 14. That a study should be made of the insecticidal properties of native plants. 15. That uniform legislation should apply to importation of plants and seeds into Kenya and Uganda. ENCLOSURE TO PART IV. ENTOMOLOGY AND MYCOLOGY. Record of Proceedings in the Entomological and Mycological Section in regard to Cotton Pests. PINK BOLL WORM. Mr. HARGREAVES read the following paper which had been prepared by Mr. Hancock in regard to Pink Boll Worm occurring on Hibiscus diversifolius (referred to in agenda as T.C.(C)E. & M.4): This note is to draw attention to the occurrence in Uganda of a species of Platyedra closely related to P. gossypiella, Saund, which has been found feeding on a wild species of Hibiscus, namely H. diversifolius. Specimens of this insect, which are exhibited here, have been examined by Mr. Meyrick who considers them to be identical with Platyedra gossypiella, Saund, the pink boll-worm of cotton. In view of the fact that this insect does not feed on cotton in the field and that the arrangement of the crochets on the prolegs of the larva differs somewhat from that of the larva of the cotton feeding Platyedra it will be well to consider this form a distinct race or species of Platyedra. As you will see from the mounted specimen of the larva there is a distinct break in the horseshoe arrangement of the cotton-feeding form. This Hibiscus-feeding form is perhaps closely related to the species which are being described from Australia but at the time of writing neither specimens nor descriptions of these forms have been received. There appears however little danger from this insect. A careful search has not revealed it on cotton nor has it been found in samples of cotton seed received from ginneries from all parts of Uganda. In the laboratory. a young larva was induced to feed in a young cotton boll, and having completed its metamorphosis, emerged as a perfect moth. It has so far not been possible to induce larvae to eat full grown cotton bolls or to feed on cotton seed. 298

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