Hello,

Since I was not provided with images of the leaves and the insect. Below is my best answer.

I’m sorry to hear about your apple tree! There are several pests that can attack apple leaves, but here are some common ones and how to manage them:

Aphids: These tiny insects feed on tender young leaves. You can manage them with insecticidal soap or 1% horticultural oil sprays, which won’t harm beneficial insects. More information at these links:

Insects - Apples (msu.edu)

Apple & Crabapple Insects | Home & Garden Information Center (clemson.edu)

The Backyard Orchard - Apple Pests | USU

Thrips: These slender, winged insects can scar leaves and fruit. Use sticky traps or natural sprays to control them. More information at these links:

Insects - Apples (msu.edu)

Apple & Crabapple Insects | Home & Garden Information Center (clemson.edu)

The Backyard Orchard - Apple Pests | USU

Borers: These pests damage trees from the inside. Keep your trees healthy through proper hydration, fertilization, and pruning to prevent infestations. More information at these links:

Insects - Apples (msu.edu)

Apple & Crabapple Insects | Home & Garden Information Center (clemson.edu)

The Backyard Orchard - Apple Pests | USU

Plum Curculio: Despite the name, they target more than just plums. Regular monitoring and early intervention are essential. This information is from a Purdue University article at this link:

Tips for managing plum curculio in tree fruit | Purdue University Facts for Fancy Fruit

Remember to maintain good tree care practices, including sanitation, clean-up of fallen fruit and leaves, and reducing weeds around the trees to eliminate breeding and overwintering sites. More information at this link:

Spray Schedule for Home Apple Trees | Yard and Garden (iastate.edu)

I hope this helps!