Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Chemical control of cone worm, Dioryctria abietella, infesting cones of Silver fir (Abies pindrow) by systemic insecticides.

Abstract

Field experiment was conducted at the seed production area of Chakrata Forest Division in Dehra Dun, Uttar Pradesh, India to study the chemical control of cone and seed insect (Dioryctria abietella) of Silver fir (Abies pindrow). Systemic insecticides both carbamates and organophosphorus were used. Two methods were followed for insecticide application: drip line application in soil; and tree injection. Analysis revealed the comparative efficiency of systemic insecticides thimet and carbofuran as drip line application in soil and monocrotophos and dimethoate applied as tree injection for the control of cone worm of Silver fir. To compare, efficacy of 100 ml or 100 g dose/20 cm girth at breast height (gbh) per tree, the effectiveness of the insecticide, was maximum in case of monocrotophos (82.44%) followed by thimet (75.76%), dimethoate (66.25%) and carbofuran (66.19%). Study of the efficiency of highest dosage, i.e. 100 ml or 100 g/20 cm gbh of the insecticide also showed that the minimum incidence (16.66%) was found by monocrotophos followed by thimet (23.07%), carbofuran (31.81%) and dimethoate (33.33%) during post treatment observation.