Int. J. Biosci.14( 1), 293-299, January 2019
Okra is an important vegetable sown all over the globe due to its nutritional value and taste. It is attacked by a tiny fly known as Whitefly. It suck the sap and also transmit Begomovirus to the okra. Whitefly being the major pest of Okra cause decline in the yield therefore, for the management this research was conducted. The efficacy of naturally occurring plant based derivatives were tested against whitefly population dynamics on Okra. Okra was sown in Randomized Complete Block Design (RCBD) having five replications. Treatments included Neem oil (5%), Garlic oil (5%), Castor oil (5%), Datura innoxia extract (2.5%), and Tegetes patella extract (2.5%) and Confidor were evaluated against whitefly population dynamics. A total of two sprays were applied with interval of 15 days. The results revealed that after 1st spray, neem oil showed high efficiency by having minimum number (0.11) of whitefly followed by confidor (0.12). After the 2nd spray, the effectiveness of all treatments increased with the exposure time. All the treatments showed high mortality by having less numbers of whitefly. Maximum shoot length was achieved with neem oil and confidor 148 cm respectively followed by castor oil 147cm. Most number of fruits (18 per plot) were found in neem and garlic oil treated plants followed by confidor 17. Maximum fruit weight was achieved with all the treatments over check. It is therefore, concluded that due to the hazardous effects of insecticides on ecosystem, these naturally occurring safe plant based insecticides should be applied for whitefly management
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