Sapota varietal performance under different spacing against bud borer, Anarsia achrasella Bradley and their management

Abstract

The varietal differences against bud borer, Anarsia achrasella Bradley under normal and high density plantations were studied during 2019-20 at Fruit Research Station, NAU, Gandevi, Gujarat, India. The average bud and flower damage due to bud borer in winter 2019-20 was maximum of 6.11, 5.90 and 5.80% in Kalipatti, DHS-1 and Cricket ball, respectively. However, the incidence of bud borer was comparatively less in PKM-1 (3.69%) and PKM-4 (4.22%). However during summer 2020, the highest infestation was reported in Kalipatti (13.34%), DHS-1 (9.40%) and PKM-4 (8.98%). While, the damage was less in PKM-1 (5.54%) and CO-3 (7.55%). The average infestation was found elevated in high density plantation (5.26 and 9.37%) than normal spacing (4.82 and 8.05%) during winter 2019- 20 and summer 2020, respectively. Also, the incidence was noted higher in summer than winter among varieties. Under management trial, the average infestation after fourth spray revealed that Azadirachtin @ 2 ml/lit and Bt @ 2 g/lit were reported lower 5.95 and 6.94% damage, respectively after fourth spray along with 67.59 and 62.19% reduction over control. After that, B. bassiana @ 4 g/lit and Azadirachtin @ 1 ml/lit were recorded infestation up to 9.19 and 9.43%, respectively and showed reduction of 49.94 and 48.61% over control, respectively.