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 TV. application is to protect the young flush of leaf. In spraying against leaf disease it is essential to wet thoroughly the undersides of the leaves, as it is on that surface that infection takes place. The finest spray nozzle obtainable should be used. It is not known whether the spraying measures advocated above would be successful in Portuguese East Africa. In Kenya, coffee is grown at altitudes of 4,500 and above Mr. RITCHIE from experience with the disease in Tanyanyika, recommended as follows: — 1. The industry should only be attempted in areas where conditions have been observed to be generally suitable for coffee. 2. A robust growing type or types of coffee should be selected suitable to the particular area, a type with strong primary growth and ample leafage. Kent's coffee, so far as Tanganyika trials have gone, is a coffee of this type but other local types (copper tip) appear also to be equally suitable. 3. So far as trials have gone, there is no decided evidence in Tanganyika that spraying with Bordeaux or Carbide mixture exerts any control on Hemileia, indeed many planters have given it up. They recognise that the great thing is natural plant vigour and general plantation management to maintain a reserve (i.e., recuperative power) in the plant. 4. There is evidence that coffee left more or less to a free form of growth and not made to conform to a humanly devised pruning system (he referred to vigorous pruning of single stem or low-top coffee), maintains of itself a satisfactorily balanced growth (crop, crop- bearing area, leafage) and is less affected by leaf disease. Causgs oF DIEBACK IN COFFEE. Mr. McDONALD read the following statement on the causes of dieback in coffee : — This short statement deals with coffee dieback as met with in this part of East Africa and is submitted in response to the request of the Government of Nyasaland for information on the subject. Much of what is known of the malady in these parts is due to the work of Dr. Small, lately Mycologist in Uganda, who began investigations on dieback at least as long ago as 1915. Experience has shown, however, that there are few, if any, differences between the problem presented in Uganda and that in Kenya. The common form of dieback of coffee is characterised by the blackening and drying up of the primary branches from their tips downwards. In bad cases the trouble may even extend to the main stem. As the dessication of the branches proceeds, their leaves and berries are naturally involved and also become brown and dried-up. Eventually such affected branches become reduced, by the shedding of the leaves and berries, to bare brittle sticks. In severe cases, the whole bush may be affected, but the commonest condition is that in which the apical branches and those in the lower half of the bush remain healthy while there is an intermediate zone affected with dieback. Dieback represents a state of exhaustion and indicates that the affected bush has undergone an excessive strain of some sort. It is never directly due to attack by parasitic agencies, although it may 209

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