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Seasonal Incidence of Sucking Pests of Okra along with Natural Enemies in Khandesh Region of Maharashtra
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Studies on seasonal incidence of sucking pests of okra along with natural enemies were undertaken at research farm of Department of Agricultural Entomology, College of Agriculture, Dhule during Kharif 2015. A study on seasonal incidence of sucking pests was undertaken on Kharif crop, revealed that leafhoppers incidence reached its peak activity during the second week of September (23 leafhoppers/3 leaves/plant) whereas the peak incidence of aphids was noticed in the first week of September (43.3 aphids/3 leaves/plant). The peak incidence of the whiteflies was recorded during the second week of September (21 whiteflies/3 leaves/plant), whereas peak activity of predator lady bird beetle was reported during second week of September (26 lady bird beetle/plant), when the population of sucking pests was at its peak. The incidence of aphids (r = 0.170), whiteflies (r = 0.287) and leafhoppers (r = -0.060) do not show any significant correlation with maximum temperature. The minimum temperature showed positive non-significant correlation with leafhoppers (r = 0.131) and positive significant correlation with aphids (r = 0.644*). The morning relative humidity showed positive non significant correlation with occurrence of the leafhoppers (r = 0.454), aphids (r = 0.458), whitefly (r = 0.313). Similarly, the evening humidity showed negative non-significant correlation with the pests such as leafhoppers (r = -0.100), aphids (r = -0.223) and whiteflies (r = -0.339) during Kharif 2015 season. The rainfall had non-significant effect at 5 per cent and 1 per cent level with whitefly, aphid and leafhopper.
Keywords
Okra, Seasonal Incidence, Kharif.
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