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 III. Cotton

Collection:: Economics Books

PART 111. } A preliminary test will be made each season with part of the bulk seed from the progeny rows which appear to be particularly promising, using Sowering and fruiting studies to decide which strains are worthy of inclusion in full field trials in the foliowing season. The balance of the bulk seed being sown in each case in an increase plot. Full field trials will consist of plots, sown with seed obtained from the increase plots, arranged in such a way as to give a known degree of accuracy to the results obtained. All new strains used in these trials will be tested against the ordinary field crop as a whole as well as against one another. The most superior strain will be further bulked with a view to replacing with it the ordinary field crop as time goes on. The aim will be to retain the pure parent stock and from this obtain further supplies of seed wherewith to renew the general seed stocks as required. Any new varieties obtained in the future will be first sown in observation plots and then selections from them will be passed to the progeny rows for purification. II. UxioN oF SouTH AFRICA. Work and methods employed are on similar lines to those described above under ‘‘ Nyasavranp.”” There are two distinet climates involved, represented by the middle and low veldts. There are two plant breeding stations, at Rustenburg and Barberton, representative of the two climates. The main plant breeding problem at Rustenburg is the general improvement of existing types with a comparatively short season as a limiting factor. A preliminary issue of seed from plants selected by the Plant Breeder has been made this year. This will be followed by pure strains. This year’s results indicate suitability to local conditions and show marked improvement in quality. At Barberton, representing low veldt conditions, the main deciding factor appears at present to be Jassid, which, combined with boll worm, is threatening the industry in many areas. There seems to be every hope that a means has been found to combat this pest through jassid-resistant strains; multiplication of one of these is proceeding. III. SwaziLaND, * The Cotton specialist arrived in Swaziland in September, 1925, and has seen one complete cotton season. An area of some 20 acres at Bremersdorp was leased, and on this, in addition to the various series of experimental plots, fairly large areas of the five commonly grown varieties were planted, as well as a few small plots of introduced American varieties, all of which served as material from which selections were made. Some 130 plants were marked in the field, the characteristics to which the greatest importance was attached being resistance to the attack of jassid. This pest appeared rather late in the season, but its attack was considered sufficiently severe to afford a test of the resisting qualities of the selections. These are in process of elimination and at present some 40 are still retained. The programme for the coming season is to plant out progeny plots from the survivors, and for this a small area which is known not to have grown cotton for many years has been selected. Besides 114

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