Top Ten Tree Problems 1. Pine Wilt: In Kansas, the symptoms for pine wilt usually appear from August through December. In general, the trees wilt and die rapidly within a short period of time. The needles turn yellow/brown and remain attached to the tree. The early stages of the disease are subtle and may vary. The pinewood nematode is transmitted from pine to pine by a bark beetle, the pine sawyer (Monochamus carolinensis). 2. Lace Bug: Lace bugs target broad-leaf evergreens such as andromeda, azalea, and rhododendron. Early detection is the key to getting rid of an infestation. Look for yellow-silver stippling on the topsides of leaves.   3. Mites: Mites pose a serious threat a wide variety of plants, and can seriously impact the visual appearance of a plant. Mites favor warm, dry climates, and are an extremely serious issue for many homeowners.   4. Tent Caterpillars: Caterpillars can weaken many trees and shrubs, increasing the chance of a secondary infestation. Look for silken, yellow cocoons.   5. Borers: Borers are attracted to unhealthy trees, burrowing in and laying eggs inside the trunk. The best defense against borers it keep your trees healthy and unstressed.   6. Scale Insects: These insects target primarily hardwoods and conifers. Some signs of an infestation include abnormal leaf and shoot growth, yellow or red leaves, and branch gouting.   7. Anthracnose Disease: This fungal disease affects deciduous and flowering trees. Look for a spotting of foliage in spring and summer.   8. Winter Injury: Even during mild winters, evergreens can lose moisture and not be able to replenish it. Thus, make sure your evergreens have sufficient soil moisture.   9. Weevil Insects: Weevils are commonly found on flowers and fruits. Look for notches around the edge of leaves.   10. Aphid Insects: Aphids are small and pearl shaped. An infestation can cause yellow discoloration and defoliation.