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

PART 1V. ) MEASURES OTHER THAN HAND-PICKING FOUND PRACTICAL FOR THE CONTROL oF Antestia oN COFFEE. Mr. RITCHIE said that in Tanganyika a poisoned syrup had been used since 1923. This was Zimmermann’s formula. Now practically every planter in the Kilimanjaro and Meru areas had used the syrup with satisfactory results. The only damage done had been due to careless application or lack of supervision. Further details were to be found in the Tanganyika Report for 1924-25. Mr. TRENCH had carried out experiments on spraying, using the following mixture : — 4 oz. Arsenite of Soda. 2 lbs. Jaggery. 4 gallons of water. This is sprayed over the bush in the form of a mist, and the planters who had used this had had satisfactory results. Mr. RITCHIE had had no good results with Arsenate of Lead, the Mally formula, but good results with Arsenite of Soda. The CHAIRMAN (Mr. Fuller) thought that it was possible that the Arsenate of Lead had been precipitated on the leaf and not taken up by insects. Mr. FULLER asked Mr. Trench what effect the spraying had on the finished coffee product; he instanced the case of the Union where the spraying with Arsenate of Lead had affected the flavour acid content of the fruit. It took three seasons before the bad effect had worn off. It was also found that by the use of the Mally bait the flavour of the fruits of apple, pear and plum were impaired, and it would be of interest to know whether coffee reacts in the same way. Mr. HARGREAVES said that experiments in Uganda had shown that by using Mr. Trench’s formula the scorching and burning of the foliage was serious. A method of applying the bait had to be found so that the poison did not come into contact with the plant. Strips of hessian cloth weére soaked in the poison and placed where the insects could get at them, but this method had proved ineffective. Mr. TRENCH said that as far as he was aware, spraying with Arsenite of Soda had so far had no deleterious effect on the finished coffee product. Mr. RITCHIE, in reply to Mr. Hargreaves, stated that the spraying had been effective at 3,000-5,000 feet on Kilamanjaro, and 4,500-5,000 feet in Arusha. It was apparent that humidity and temperature had to be taken into account. Mr. FULLER pointed out in this connection that the results seemed to depend on what Arsenite was used. Mr. HARGREAVES said that for the earlier experiments the Arsenite was obtained locally; afterwards the Arsenite was made by the Government Chemist from white Arsenic and Soda. and still scorching resulted. ~ The CHAIRMAN (Mr. Fuller) stated that experiments were being conducted in South Africa with the Mally remedy for adult moths, and seemed promising. 19¢

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