Biological control tests against three species of Pseudococcidae (Homoptera, Coccoidea) in greenhouses.
Biological control of mealybugs on various kinds of ornamental plants in greenhouses at Antibes in southern France was attempted by means of releases of the Coccinellid Cryptolaemus montrouzieri Muls. and the Encyrtid Hungariella pretiosa (Timb.), either alone or together, and of H. pretiosa with another Encyrtid, Pseudaphycus maculipennis Merc. P. maculipennis gave good control of Pseudococcus obscurus Essig at temperatures of 20-25 deg C, even when the mealybugs were attended by Iridomyrmex humilis Mayr. The larvae of C. montrouzieri controlled Planococcus citri (Risso) at over 20 deg C but were ineffective at lower temperatures or in the presence of ant attendants. H. pretiosa was not effective against Pseudococcus adonidum (L.).