Two New Phosphates for Control of Overwintering Eggs of Aphids and Mites on Deciduous Fruit Trees1

Abstract

Ethion in combination with dormant oil has given excellent control or several mite and insect species when applied as a dormant or delayed dormant spray. Phostex-oil sprays have given excellent control or aphid species when applications are restricted to the delayed dormant period. Phostex® is a mixture or bis(dialkyloxyphosphinothioyl) disulphides. The mite control during the delayed dormant period with Phostex-oil has in general been fairly good. The species controlled include the rosy apple aphid, Anuraphis roseus Baker; mealy plum aphid, Hyalopterus pruni (Geoffroy); black cherry aphid, Myzus cerasi (F.); European red mite, Panonychus ulmi (Koch); and the clover mite, Bryobia praetiosa Koch. Trials were conducted in California over a 3-year period. Tests were applied from January through March in an attempt to determine timing of application in relation to control. In general, more toxicant and oil were needed during the dormant than during the delayed dormant period for equivalent control of rosy apple aphid, European red mite, and clover mite. The amount of toxicant and oil required for control of mealy plum aphid and black cherry aphid was constant all during the dormant period.