Control of cone worm, Dioryctria abietella Denis and Schiffermueller (Lepidoptera: Pyralidae) in seed production areas of spruce, Picea smithiana Boiss by systemic insecticides.
Control of cone worm Dioryctria abietella infesting cones and seeds of spruce (Picea smithiana) in seed production areas (SPAs) was attempted. The systemic insecticides Thimet [phorate], carbofuran, dimethoate and monocrotophos were applied at the point of drip-line application in soil and through tree injection at the base of the trees in a SPA at Deoban, Kanasar Range, Chakrata Forest Division (Uttaranchal, India). Tree injection with monocrotophos 36 EC 100 ml with 20-cm girth at breast height was found superior than the application of granular pesticides in the soil at the drip line. Tree injection could protect spruce cones from the attack of cone worm up to 86.49%.