Roots and tubers
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Browsing Roots and tubers by Subject "Breeding"
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Item Breeding Cassava for Virus Resitance(1947) Nicholas, R.F.W.; AmaniSo long as cassava (Manihot utilissima Pohl.) continues to rank as a staple food for a large proportion of the indigenous population of East Africa, the improvement of the crop must figure in the agricultural economics of the country. The comparative freedom of the crop from pests, and its drought resisting qualities, render it of particular value as an "insurance policy" against famine when it is less afflicted by drought and locusts than other crops. That it is, however, subject 'to great reduction in yield, due to infection by the mosaic virus, has been recognized for many years. In Zanzibar, Briant and Johns (1940), have shown that the loss in a non-tolerant variety, propagated from diseased cuttings, may be as high as 95 per cent. Experimental work at Amani demonstrated that this virus was transmitted by a white fly, Bemisia sp. (Storey and Nichols, 1938); field experiments showed that natural infection was mainly seasonal and in certain areas extremely high. These experiments also demonstrated that some varieties are less prone to infection than others. This disease occurs throughout East AfricaItem National Agricultural Research Project Quarterly Report of Activities and Progress July - September, 1995(National Potato Research Centre, 1995) National Potato Research CentrePersonnel - Dr. R. S. Malik was on home leave in the U.S. during portions of July and August. Vehicles - Transport for Technical Advisors is satisfactory. Due to reductions in staffing, two Isuzu Troopers were transferred from MIAC to KARI. Finance and Accounting - On July 20, the annual work plan and budget for the period July 1, 1995 - June 30, 1996 was approved by USAID and PIL 33 issued. The annual increment of funding to the KARI MIAC Contract for the period is $2.6 million. This is about 900,000 less than was planned for when NARP II was approved.
