Insecticidal Activity of Some Botanicals against the Sucking Insect Pests of Cotton



Jassid (Amrascadevastans), thrips (Thripstabaci) and whitefly (Bemisiatabaci) have become major pest due to invasion of Bt cotton. Insecticidal resistance by these pests is another threat, keeping in view these facts seven botanicals viz., peppermint (Menthapiperita), turmeric (Curcuma longa), hot pepper (Capsicum annuum), ginger (Zingiberofficinale), akk (Calotropis procera), bitter gourd (Momordicacharantia) and mehandi (Lawsoniainermis) were tested for their efficacy against population of jassid, thrips and whitefly in cotton. Eight treatments including control were maintained following RCBD with three replications. The treatments were administered twice during the cotton growing season and observations were recorded after 24, 72 and 168 hours of treatment. The results revealed that extract of ginger was most efficient bringing about highest percentage mortality (83.3%) in the population of jassids followed by hot pepper (78.3%) and bitter gourd (68.2%). Similar effect of these extracts was found against thrips and whitefly. Turmeric and peppermint were found to be least effective although both caused significant reduction in the population of sucking pests as compared to the control. Higher yield was recorded in plots treated with ginger (2304.4 kg ha-1), hot pepper (2082.2 kg ha-1) and bitter gourd (2000 kg ha-1) as compared to that in control (1302.2 kg ha-1).It is concluded that all the used botanicals were effective to reduce the population of jassid, thrips and whitefly on cotton; however, ginger and hot pepper performed comparatively better than others.

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