Biological control of the main pests on tea plantations in the Georgian SSR.
The author states that the most important pests of tea in the Soviet state of Georgia are Aspidiotus destructor Sign. (Temnaspidiotus destructor) Aspidiotus transparens Green [a synonym of A. destructor] Abgrallaspis cyanophylli (Sign.), Chloropulvinaria floccifera (Westw.), Argyrotaenia pulchellana (Haw.) and Sparganothis pilleriana (Schiff.) Lists are provided of the pathogens and arthropod predators and parasites found attacking them there, and it is reported that tests over many years have shown that tent fumigation with hydrogen cyanide against the principal pests can be completely replaced by biological control methods. The imported coccinellid Lindorus lophanthae (Blaisd.) is effective against A. destructor and Abgrallaspis cyanophylli; and seasonal release of Cryptolaemus is effective against Chloropulvinaria floccifera. Entobacterin-3 [a preparation of Bacillus thuringiensis] is effective against Argyrotaenia pulchellana. On some plantations, indigenous entomophagous insects so reduce the pest populations that no other control measures are necessary. Depending on local conditions, the numbers of Lindorus and Cryptolaemus released can be reduced, and the use of Entobacterin-3 can be restricted to a single spray application.