Vol. 10, Issue 10 (2021)

Author(s):
Shalendra Pratap Singh and Ramakant Dwivedi

Abstract:
A field experiment was conducted at Chandra shekhar azad university of agriculture and technology Kanpur (U.P) on tomato crop to study the bio-efficacy of natural compounds against H. armigera in tomato during rabi season 2018-19 and 2019-20. Cow urine + neem leaf extract 5% @ 50 ml/l. as spray on standing crop with 38.01 population reduction over control proved best among all treatments by reducing mean number of larvae to the tune of 0.76. The second best treatment applied to the tomato crop on standing crop as spray form was neem leaf extract 5% @ 50 ml/l, with 35.02 population reduction over control with mean number of larvae i.e. 0.80. The third best treatment spraying to the crop was cow urine + tobacco extract 5% @ 50 ml/l, with 26.47 population reduction over control with mean number of larvae 0.91 which was statistically at par with cow urine + moringa leaf extract 5% @ 50 ml/l, with 25.66 population reduction over control with mean 0.92 larvae, moringa leaf extract 5% @ 50 ml/l, with 25.34 population reduction over control with mean number of larvae 0.92 and tobacco extract 5% @ 50 ml/l. with 24.29 population reduction over control with mean 0.93 larvae. Treatment cow dung ash as splitting form on standing crop was found most inferior among all the treatments with 19.37 population reduction with mean number i.e. 0.99 larvae but it was statistically superior in comparison to control in which 1.23 mean larvae were recorded. In this experiment we observed that the organic or botanical biopesticides proved best to manage the fruit borer population in tomato crop.