Browsing by Author "Louie, R."
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Item Disease Resistance and Yield Loss to Sugarcane Mosaic Virus In East Mrican-adapted Maize1(1980) Darrah, L. L.; Louie, R.Maize (Tea mays L.) inbreds, cultivars, and hyhrids were tested for resistance to two Kenya isolates of sugarcane mosaic virus (SCMV-Kit and SCMV-Mug) _ Sixteen out of 4,380 plants representing 8 of 71 entries were resistant. Five S, plants from field selections continued to demonstrate resistance to SCMV. S. plants from Philippine DMR-5 mechanically inoculated with SCMV-Kit and SCMV-Mug appeared highly resistant or tolerant. Pa405, a U.S.-adapted inbred, was also resistant to SCMVKit and SCMV-Mug. When mechanically inoculated with SCMV-Kit, 10 Kenyan hybrids had yield losses that varied 1 from 18 to 46%. Yield losses varied significantly by hybrid but not time of inoculation. The interaction of hybrid X time of inoculation was not significant for yield. Tolerant hybrids, such as H6HC, H6U(R) C5, H612C, H5020, or EAH6302, are recommended in areas of East Africa where SCMV is prevalent.Item Heat Therapy of Cassava Infected with African Cassava Mosaic Disease(1982) Kaiser, W.J.; Louie, R.; Kenya Agriculture Research Institute, Nairobi, KenyaThe pathogen was eradicated from 33-44% of tip cuttings (1-1.5 cm long) after hot-air treatment of mother plants at 37 deg C for 87-105 days. Survival of these tip cuttings after 35-105 days was 22-73%. Exposure of entire plants to hot air treatment at 37 deg for 47-96 days caused temporary remission of symptoms in most plants. Only 1 of 129 surviving plants were freed from disease. Two successive hot-water treatments of diseased stem cuttings at 50 or 55 deg for varying intervals were not therapeutic.Item Sugarcane Mosaic Virus in Kenya(1980) Louie, R.; Kenya Agriculture Research Institute, Nairobi, KenyaSurveys revealed the virus in maize in 20 districts of the 34 surveyed and only in the western plateaux, Central Highlands and Rift Valley. High incidence occurred in Nyanza (15.2%), Rift Valley (15.8%) and Western (19.6%) provinces. The virus was not found on the Coast or Nairobi provinces. Incidence was higher in late-planted than earlier-planted maize. It was also newly reported naturally infecting 9 grass spp, including Cynodon dactylon. Distribution in maize appeared to be related to the distribution of inoculum sources, periodicity of disease development to vector populations. Maize streak and maize mosaic viruses were most often found in the Central and Coast provinces.
