utah home orchard guide
Table of Contents pdf version


Spotted asparagus beetle feeding on new asparagus spears


  • pome
  • stone fruits
  • nut trees


Many species of aphids feed on leaves of fruit trees. Rosy apple aphid will feed on apple fruits causing deformities and woolly apple aphid feeds on limbs  and roots causing galls. All aphids suck sap from the phloem vessels and reduce tree vigor. Watch for curled and sticky leaves due to honeydew excreted by the aphids. Black sooty mold may grow on the honeydew staining leaves and fruits.  Ants may climb into trees to collect the sweet honeydew and can indicate an aphid infestation. Aphids are small, soft-bodied insects of numerous colors (e.g., green, red, brown, black) and often occur in clusters. Numerous beneficial insects (e.g., lady beetles, lacewings, and syrphid flies) help suppress aphid populations, so conserve and protect these natural enemies. The home orchardist can usually ignore aphid infestations unless the populations are extremely high, growth of young trees is being stunted, or black sooty mold is staining the fruit.


Precautionary Statement: Utah State University Extension and its employees are not responsible for the use, misuse, or damage caused by application or misapplication of products or information mentioned in this document. All pesticides are labeled with ingredients, instructions, and risks, and not all are registered for edible crops. “Registered use” pesticides may only be applied by a licensed applicator. The pesticide applicator is legally responsible for proper use. USU makes no endorsement of the products listed herein.