The fall webworm, Hyphantria cunea Drury (Lepidoptera: Arctiidae) causes damage to more than 200 species of deciduous trees in Georgia-Batumi. H.cunea is an insect pest of road-side and garden and parks trees in Adjara (Kobuleti, Urekhi Ozurgeti, Khelvachkhauri regions) where in summer during resort season, nearly all plants are destroyed by American White Butterfly. The fall webworm It feeds on almost ail fruit, shade, and ornamental trees except conifers, commonly attacking hickory, walnut, birch, cherry, grape, apple, prunus and crabapple. Fall webworms are known fort he large, unsightly webs they produce. Heavy infestations are rarely fatal, but if they ocur repeatedly over several years they can stres trees and maket hem more susceptible to drought, disease or other insect pests. Various control methods have been deployed against the pest H.cunea such as Mechanical (removal of nets), biological (encourage predators and parasities;apply Btk) and chemical (Standard and systematic insecticides) control. This study was conducted to determine the effect of Bacillus thuringiensis var. kurstaki (Btk) and Neemazal on the larvae of Hyphantria cunea Drury, (Lepidoptera: Arctiidae) in 2012.

            Firstly, fourth-fifth star larvae of fall webworm in second generation is collected from forest and agricultural areas in Artvin,Arhavi. We put 15 larvae and fresh alder leaves in each test container. Alder leaves before is sprayed with Bacillus thuringiensis var. kurstaki formulation Bio-T Plus (consisting of 16,000 IU mg spores, we put in 1 cc for 1 liter), later dried. These leaves are put test container on 08.26.2012. Test containers were checked 3 times on 30.08.2012 and 07-14.09.2012. Fifty-four larvae and two pupa died the total number of 75 larval in test containers. Four pupa has got parasitoids which are Chouioia cunea (Yang). Fifteen pupa was butterfly. It was also estimated that the pesticide was effective on the 4th and 5th larvae stages of the second generation with 74.6%. Another experiment was use Neemezall (1 cc for 1 liter). Fortyseven larvae and five pupa died the total number of 75 larvae in test containers. Seven pupa has got parasitoids which are Chouioia cunea (Yang). Sixteen pupa was butterfly. It was also estimated that the Neemazal was effective on the 4th and 5th larvae stages of the second generation with 69.3%. The present study showed that Btk and Neemazal have got possitife effect for control of H.cunea.

Key words: Hyphantria cunea; Bacillus thuringiensis var. kurstaki; Neemazal.