American fall webworm in Kazakhstan.
The fall webworm, Hyphantria cunea, was first identified in Almaty province, Kazakhstan, in 2003 in the Ili region. By 2006 it had spread to other regions and occupied an area of 1383 ha in the province, causing damage to trees, especially fruit trees, with up to 80% defoliation being recorded. Results are briefly discussed of studies on the pest's biology and ecology and on control measures. The effectiveness of a range of products for controlling the 1st and 2nd generations was investigated in 2004-05 in field and laboratory tests. Insecticides with high levels of control (98-99.1% by the 3rd day after application) included Talstar [bifenthrin], Kinmiks [beta-cypermethrin], Fastac [alpha-cypermethrin] and Karate [lambda-cyhalothrin]. The chitin synthesis inhibitors Dimilin [diflubenzuron], Nomolt [teflubenzuron], Herald [a synthetic pyrethroid] and Match [lufenuron] gave 97.1-98.7% control within 7 days. The Kazakh-manufactured biological preparation Lepidotsid [based on Bacillus thuringiensis subsp. kurstaki] gave 100% mortality after 9 days when applied at a concentration of 0.3% to leaves of box elder [Acer negundo] fed to the pest. For fall webworm control in Kazakhstan, Dimilin, Nomolt, Match and Lepidotsid are recommended.