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

20.0 PART IV. Mr. RITCHIE said that in the Kilimanjaro region planters have tried dipping small pieces of Turkey red cloth in a stronger solution of the poison and placing these inside the bush; by this method washing off by rain is obviated. In Tanganyika they were also experimenting with this syrup poison against Dysdercus. THE StaTUS OF Gonocephalum simplex. Mr. ANDERSON said that Gonocephalum did the same damage to coffee trees as cut worms if the trees are stumped back too much; it completely ring barked them. A bait of 60 lbs. of bran mixed with 1 lb. Paris green, spread round each tree, completely destroyed the Gonocephalum. 25 lbs. of the mixture, no sweetening agent being necessary, should be used for one acre of coffee. In Kenya this cut worm attacked wheat to a considerable extent, but was not found to a great extent on coffee. | Roor ExLworm (Heterodera radicicola). Mr. RITCHIE said that the eelworm did considerable damage In newly set-out coffee, which had been planted in fields previously planted with general food crops (i.e., land previously infested). He understood that this pest was becoming so serious in the Congo that they were considering the question of budding Coffea Arabica on to Coffea myrthifolia which was resistant to the pest. Mr. SMEE stated that Eeelworm was a serious pest on tobacco in Nyasaland. He had no knowledge of it in regard to coffee. Mr. WILKINSON stated that it occurred in Kenya but had not been found to be a pest. Mr. HARGREAVES had heard of no report in Uganda that this eelworm was a pest on coffee. The CHAIRMAN (Mr. Fuller) said that it was a serious pest on fruit trees in the Cape Province. No soil treatment appeared to be of any use; he could only suggest that, in places where it is a pest, a suitable rotation of crops should be tried or that grass should be planted to clear the land first. Corre LEA¥ Disease (Hemileia vastatriz). Mr. RITCHIE said that Kent's and Jackson’s types had been imported into Tanganyika for trial as to their relative resistance to Hemileia. In Mysore, where these types were selected, Kent's would appear to have been more resistant to Hemileia than local types there, but Jackson’s less so. In Tanganyika, Kent's was proving a robust grower, with plenty of leaf, and, while not immune to Hemileia, was considerably resistant; their Jackson’s was too young to form an opinion, and he had raised this question as he wished to ascertain, from the experience elsewhere, whether the further importation of seed of these types should be recommended. Mr. McDONALD stated that there were no Kent’s or Jackson's in bearing in those parts of Kenya where leaf disease is prevalent. He had been informed that some young trees of these types had been found to be more resistant to leal disease, but no conclusion was justified from experience in Kenya so far. OC

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