A Comparative study on the prevalence of Okra Insect Pests and their Associated Predators among some Okra Cultivars in Shambat Area-Sudan
2007
Satti, A.A., Ministry of Science and Technology (Sudan). Environment and Natural Resources Research Institute, National Centre for Research | Nasr, O.E., Ministry of Science and Technology (Sudan). Environment and Natural Resources Research Institute, National Centre for Research
Eight local okra cultivars and two introduced varieties were screened for their susceptibilities to different insect pests and the presence of predators in two field experiments during autumn (1999) and winter (2000/01) seasons at Shambat, Khartoum North, Sudan. The jassids )Jacobiasca lybica), aphids (Aphis gossypii) and bollworms (Earias insula/za and E. vittella) were recorded as major species. The build up of the two former species occured in the winter season and of the boIl worms in autumn; their seasonal incidences on the tested cultivars were compared. Gamoea, the most popular in Khartoum State, was among the highly infested cultivars, whereas Khartoumia-Red showed the lowest infestation by all pests. Damage of Earias spp. was unevenly distributed in the field, with marginal plots exhibiting relatively higher infestations. The ratio of Earias vittella to E. insulana in winter (6: 1) was double the ratio in autumn (3: 1). The effects of these pests on crop development and yield were studied. Moreover, the build up of the recorded predators in the field seemed to follow more or less the same seasonal trends of important okra pests, especially aphids and bollworms. It is concluded that Khartoumia-Red is the best resistant cultivar, which can be studied as a possible source of genes for insect pest resistance in okra
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