Apple Pest Management Guidelines
UC agricultural management guidelines for control of apple pests. Major Monitoring Periods in an IPM Program (8/06) Relative Toxicities of Insecticides and Miticides Used in Apples to Natural Enemies and Honey Bees (8/06) General Properties of ... [... more]
University of California IPM |
Pathogen: Podosphaera leucotricha
Powdery mildew is distinguished by superficial, white powdery growth on leaves and shoots that results in the stunting and distortion of young growth. Infected fruit are stunted and russetted, and fruit set may be reduced. This is a major foliage ... [... more]
University of California IPM |
HAND-THINNING
Thinning is required to optimize fruit size and quality in apple orchards. Thinning also helps keep trees from biennial production and maintains a balance between vegetative growth and fruiting. Apples can be thinned chemically, by hand, or by a ... [... more]
University of California IPM |
Speckled green fruitworm: Orthosia hibisci
Immature larvae of both species are light green caterpillars. Mature green fruitworms have green bodies and green heads. Speckled green fruitworms have cream-colored lines down the back and sides of the body. Humped green fruitworms are ... [... more]
University of California IPM |
Apple Scab
Superficial, velvety dark-olive-to-black spots on fruits and leaves are the initial symptoms of apple scab. These fruit spots become scablike with age and tissues may become misshapen. The fungus survives in dead leaves on the ground. Primary ... [... more]
University of California IPM |
Scientific name: Phyllonorycter spp.
Adults are small, golden brown moths with white bands or spots that give them a silvery appearance when they fly in sunlight. In spring eggs are laid in young leaves during the period from the tight cluster bloom stage through petal fall. Larvae ... [... more]
University of California IPM |
Rosy Apple Aphid
Newly hatched rosy apple aphids are dark green and are found on new growth in early spring. Mature rosy apple aphids, clustering in curled leaves or on young fruits in spring, are purplish and covered with a waxy, powdery bloom. Winged forms ... [... more]
University of California IPM |
Scientific name: Orgyia vetusta
Western tussock moth has one generation a year. Wingless females lay 125 to 300 eggs in a single mass on the empty pupal case. Overwintering eggs hatch when spring growth is expanding. Young larvae are black caterpillars with long bristles; ... [... more]
University of California IPM |
McDaniel spider mite: Tetranychus mcdanieli
UC Management Guidelines for Webspinning Spider Mites on Apple. Adult female mites are larger and more elongated than European red mites and are green to yellow. Feeding mites have a dark spot on either side of the body that may enlarge to cover ... [... more]
University of California IPM |
PINK BUD TO
Generally fruittree leafrollers are the first caterpillars seen in samples taken after green tip and have about 2 weeks to feed before the first codling moth spray goes on. Young larvae are easiest to control because they have not yet constructed ... [... more]
University of California IPM |
Bacterial Blossom Blast
UC Management Guidelines for Bacterial Blossom Blast on Apple. Fruit buds infected in early bloom stop growing, turn brown and papery, and may drop off. Later infections affect flower petals and stems, and fruit cluster bases turn brown or black. ... [... more]
University of California IPM |
Conchuela: Chlorochroa ligata
Stink bugs and other plant bugs occur in all of California, but only reach damaging numbers sporadically. Although they may differ in color and size, stink bugs have the same overall shield-shaped body. The consperse stink bug is the most common. ... [... more]
University of California IPM |
