Efficacy of ULV Application of Nuclear Polyhedrosis Virus with Certain Adjuvants for the Control of Heliothis armigera (Hbn) on Cotton
Results of the field experiment on the control of Heliothis armigera (Hbn.) on cotton with nuclear polyhedrosis virus (NPV) revealed that four rounds of ULV application of the virus at 450 larval equivalents (lE)/ha along with endosulfan 350g a.i./ha with adjuvants like larval extract of H. armigara 4 per cent or whole milk 10 per cent + crude sugar 15 per cent or cotton seed kernel powder 2.5 per cent + crude sugar 17.5 per cent were as effective as endosulfan 700g a.i./ha in reducing the larval population of H. armigera and damage caused to flowers, squares and boils. The different NPV treatments applied with adjuvants significantly increased the seed cotton yield over untreated check.
NPV Control, Heliothis Armigera, Adjuvants, Larval Extract, Field Efficacy, Cotton.
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