Chemical Control of Cone Worm, Dioryctria abietella, Infesting Cones of Silver Fir (Abies pindrow) by Systemic Insecticides

Chemical control of cone and seed insect of Himalayan Silver fir (Abies pindrow Royle) was conducted by using systemic insecticides. Two methods were followed for insecticide application: (i) Drip line application in soil, and (ii) tree injection. Performance ofmonocrotophos @ 100ml per 20 cm gbh of a tree was found best, protecting 82.44% cones of Silver fir used as tree injection followed by drip line application in soil by thimet @ 100 g per 20 cm gbh where 75.76% cones were protected from the attack of cone worm, Dioryctria abietella.