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Laboratory experiments with juvenoids on the san jose scale quadraspidiotus perniciosus



Laboratory experiments with juvenoids on the san jose scale quadraspidiotus perniciosus



Acta Phytopathologica Academiae Scientiarum Hungaricae 11(3-4): 295-304



Six juvenoids, SJ-53 [ethyl-11-chloro-3,7,11-trimethyl-2-dodecenoate], ZR-512 [ethyl-3,7,11-trimethyl-2,4-dodecadienoate], ZR-515 [isopropyl-11-methoxy-3,7,11-trimethyl-2,4-dodecadienoate], ZR-619 [5-ethyl-11-methoxy-3,7,11-trimethyl-2,4-dodecadiene thioate], ZR-777 [2-propynyl-3,7,11-trimethyl-2,4-dodecadienoate], and R-20 458 [1-(4-ethyl-phenoxy)-6,7-epoxy-3,7-dimethyl-2-octene] were applied in 0.001-1% acetone solutions or aqueous emulsions to young apples and to shoots of red currant infested by the San Jose scale. Second instar larvae and pronymphs (prepupae) were treated in both the overwintered and summer generations. The JH [juvenile hormone] analogues in 0.01% or 0.1% concentrations induced relatively high levels of mortality in males but only moderate mortality in females. Males died mostly as nymphs (pupae), females as young, unproductive adults. At low concentrations, the natural hymenopteran parasitoids [Prospaltella perniciosi Tow. and Aphytis proclia Walk] of Quadraspidiotus seemed not to be affected by the juvenoids. At the highest concentration of 1%, which proved effective in both sexes of the host, parasitoid emergence was significantly reduced. A suggestion for rational and economic control of the San Jose scale is put forward: selective juvenoids can be successfully used as control agents against the male population of the overwintered generation in pronymphal and nymphal stages.

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