Home Orchards: Table 4.9. Pesticide Recommendations for Scab-resistant Apples

The following spray schedule and times might vary by as much as 2 weeks, depending on the region of Pennsylvania in which the trees are located.
Home Orchards: Table 4.9. Pesticide Recommendations for Scab-resistant Apples - Articles


Apply sprays only if disease and insects have been a problem as determined by scouting procedures. These varieties can tolerate some disease and insect pressure without adversely affecting tree health and fruit quality. Varieties differ in their susceptibility to pests, and young trees are more susceptible to all pests. Due to a wide array of various products containing the same active ingredient, for insecticide recommendations, when appropriate the active ingredient is listed instead of the name of formulated product. Always consult the label before making pesticide applications. Labels vary greatly between commercial products of the same material. It is important to refer to the label for the best timing and application rates when applying pesticides. Also read the text for information on cultural practices to minimize the application of pesticides. To avoid harming bees, do not use an insecticide in sprays applied during the bloom period.

Caution: Broad-spectrum insecticides (those with a large number of pests listed on the label) have significant potential to be harmful to non-target organisms such as bees and other beneficial or predatory insects.

Time to SpraySuggested MaterialsPests to be Controlled
Dormant - late March to early AprilOil (dormant oil)Aphid and mite eggs
Green tip - when leaves are 1/4 inch longSuperior Oil plus EsfenvalerateMites and rosy apple aphids
Prepink - first pink color of flower budsBacillus thuringiensisTent caterpillars
Gypsy moth larvaea
Petal fallb - 90% of flower petals offImidacloprid plus
Surround plus Esfenvalerate
Plum curculio, codling moth
Mid-June to mid-AugustCaptan
Safer Insecticidal Soap,
CM granulosis virus or
Mating disruption
Summer fruit rotsc, sooty blotch, flyspeck
Green aphids mites
Codling moth, Oriental fruit moth
Mid-July to AugustCM granulosis virus plus ImidaclopridCodling moth, Japanese beetle
Early July to early SeptemberSpinosad

Apple maggot, leafrollers

a. If larvae numbers are high and if trees are young, two spray applications might be necessary.
b. Plum curculio and codling moth can severely damage fruit. If the amount of fruit damage was severe the previous season, a second application 7 to 10 days after petal fall might be necessary.
c. A total of two to four fungicide applications per season might be needed to protect fruit surfaces, depending on the amount of disease in the orchard.