Effect of bio rational management practices on pink bollworm damage in Bt cotton
KN Jawanjal, PW Nemade, SB Kumre and Aparna Sontakke
The present investigation entitled was carried out during kharif of 2018-19 on, the research farm of Cotton Research Unit, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola. The field experiment was laid out in Randomized Block Design with nine treatments and three replications. The results revealed that minimum green fruiting bodies damaged was recorded in treatment T6 i.e. 0.68 per cent where weekly destruction of rosette flower along with 5 releases of trichocards @ 3 cards/acre alternated with 4 sprays of Azadirachtin @ 10 ml/10 liters at 10 days interval starting at 50 DAE were carried out whereas, maximum 2.01 per cent was recorded in untreated control. Same trend was observed in case of green boll damaged where minimum green boll damaged recorded due to pink bollworm was 9.58 per cent and maximum 32.92 per cent was observed in control. Overall minimum pink bollworm damage was recorded in treatment T6 i.e. 10.83 per cent and maximum 52.41 per cent was recorded in untreated control at the time of harvest.