Browsing by Author "Wallace, G.B."
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Item Bacterial Blight of Peas(1951) Wallace, M.M.; Wallace, G.B.; Department of Agriculture Tanganyika TerritoryA destructive bacterial disuse of field pea and sweet pea has appeared recently in the Northern Province of Tanganyika Territory. The identity of the bacteria concerned is not yet certain, but it is considered advisable to bring the disease to the notice of farmers, gardeners and other without delay. Material has been sent for identification to Dr. W. J_ Dowson at the Botany School, Cambridge. And he kindly undertaken investigation of the organisms’ present. His conclusions are awaited and will be communicated in a subsequent number or this Journal.Item Defoliation of Crops by a Gemmiferous Fungus(1949) Wallace, G.B.The disease described in this article is of particular interest to farmers at the higher elevations where the climate is wet and cold for prolonged periods. Under such conditions tea, coffee and eucalyptus have been found infected, while the wide range of less important plants also attacked would indicate that the majority of broad leaved crops are potential host plants. So far the disease has only been observed in two of the higher parts of the Southern Highlands Province and on one plantation at the east end of the WestUsambara Mountains, both in Tanganyika Territory, but its range may be much widerItem Diseases of Papaw and their Control(1948) Wallace, G.B.; Department of Agriculture, TanganyikaIt is considered that disease in papaw will seldom be a serious problem if attention is paid to the choice of site and to field operations such as planting and irrigation. The tree quickly responds to environment and culture. Parasitic fungi are often, although not always, associated with disease in the plant; they can be controlled by repeating spraying, but so far as possible they should be prevented. Cultural conditions which encourage healthy growth have been dealt with in an article by one of us'(GBW) on cultivation of the crop [3].Item Diseases of Pawpaws(1943/1944) Wallace, G.B.A disease of papaw trees has recently been found on a few estates in the Northern Province of Tanganyika Territory. It can cause a certain amount of damage to individual fruits and can also kill seedlings or mature trees. As a rule only a comparatively small number of trees are killed and the cumulative amount of loss may not at once be appreciated. A full investigation has not yet been undertaken, but this preliminary note will indicate the nature of the disease and measures which will enable considerable control to be effected.Item French Bean Diseases and Bean Fly in East Africa(November 1939) Wallace, G.B.; Department of Agriculture, Tanganyika TerritoryDuring the past year planters in the Tanga and Northern Provinces of Tanganyika Territory have inquired what explanations can be offered for the poor growth and low yields that have been obtained with French beans. The present article calls attention to factors which are in a considerable degree responsible, and it should encourage planters to a renewed interest in the crop. The market price, while not high, has in itself not discouraged bean culture, but together with low yields and poor appearance of the harvested beans-it has reduced the acreage in recent years. Higher yields and better appearance, both of which are possible, will to a large extent off-set low average prices.Item Kromnek Disease(1947) Wallace, G.B.; Tanganyika TerritoryAttention is called to the virus disease, known in South Africa as Kromnek, since there is good reason for believing that it has become established in the south-west of Tanganyika Territory. Until now the disease on this Continent has been confined to South Africa and Southern Rhodesia: The evidence for its presence in Tanganyika is based on observations made in the Southern Highlands Province earlier this year, where two plants of tobacco and two fields of sunflower showed symptoms indistinguishable from those of kromnek. Because of the serious nature of that disease it is considered advisable not to wait for full confirmation of the nature of the disease in these crops, but to issue this warning, particularly to farmers and gardeners in the affected area and to prospective importers of plants from there. During the past year herbaceous ornamental plants have not been allowed entry into East Africa from countries in which the disease is endemic, in an endeavor to keep out the disease.Item A Non-parasitic disease of arabica coffee(1939) Wallace, G.B.The disease of coffee described below is characterized by certain unusual symptoms in the bark and wood, and results in the death of trees. That the explanation offered to account for it is the correct one has not yet been proved, but it is sufficiently plausible to warrant this brief account. The trouble was referred to in the Annual Report for 1936 of the Department of Agriculture, Tanganyika Territory.Item A Revised List of Plant Diseases in Tanganyika Territory(1937) Wallace, G.B.; Department of Agriculture, Tanganyika TerritoryThis revised list, arranged in alphabetical order of the hosts, of the diseases of over 80 plants of economic importance in Tanganyika Territory, contains the records made from 1927 to 1936, and with a few additions and amendments combines the lists already published [R.A.M., xiv, p. 746].Item A Root Disease of Cacao(1935/1936) Wallace, G.B.A disease of cacao and of kapok growing together on a plantation in the Usambara Mountains has been found associated with the fungus U stulina;{.onata. The disease had been known there for some years, but is only now diagnosed.
