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Articles by P.N. Rapando
Total Records ( 2 ) for P.N. Rapando
  P.N. Rapando , A.W. Wangai , I.M. Tabu , J. Ombiri and R. Ramkat
  Tomato spotted wilt topspovirus (TSWV) disease was recently reported to be endemic and posing a threat to cucumber production in Nakuru District, Kenya. A study was conducted to determine the response of commercially available cucumber varieties (Ashley, Marketer, Super Marketer and Chinese) to the disease and the effect of time of onset on disease severity and crop yield. The study was carried out in a green house where the four varieties were inoculated at cotyledon, 3-4 leaf stage and flower bud stage of growth. The experiment was arranged in a split plot design replicated four times. Variety Marketer was more tolerant to the disease compared to other varieties. All the varieties were generally tolerant to the disease at the cotyledon stage at the 3-4-leaf stage and the flower bud stage the plants were however susceptible to the disease. It was therefore concluded that planting variety Marketer and controlling the disease especially at 3-4 leaf and flower bud stages could form important components of integrated pest management programme of TSWV.
  R.C. Ramkat , A.W. Wangai , J.P. Ouma , P.N. Rapando and D.K. Lelgut
  Tomato (Lycopersicon esculentum) is popular both in fresh market and processing industries. Tomato yields are limited by diseases, Tomato spotted wilt tospovirus (TSWV) disease being one of them. A study was conducted in a greenhouse to determine the effect of mechanical inoculation of tomato spotted wilt tospovirus on the severity of the disease on tomato varieties Cal J, Marglobe, Money maker, Roma and Riogrande and its impact on yield. The experiment was arranged in a split plot design replicated four times. Tomatoes variety Cal J was most severely affected by the disease whereas Marglobe and Riogrande were least affected. Mechanical inoculation reduced total yield of Cal J, Riogrande, Money maker, Marglobe and Roma by 60, 55.3, 45.1, 40.3 and 27%, respectively. Marketable yield was reduced significantly by inoculation for the varieties except for Roma with a slight reduction in marketable yield that was not statistically significant from healthy controls. Roma was shown to be a tolerant variety that can be given to resource poor farmers as a component of an Integrated Pest Management (IPM) system for control of TSWV in order to realize higher marketable yields.
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