Peach
Symptom Cause  
Leaves wrinkled or curled; discolored, stunted, tend to fall off
Aphids
>
Skin of fruit pierced or partially eaten
Birds
>
Many holes in trunk and branches; small limbs girdled sawdust at holes
Borers
>
Small brown spot; fruit matures and spot enlarges to rot part or all of the fruit.
Brown Rot of Stone Fruit
>
Skeletonized leaves
Cankerworms
>
Much foliage is eaten starting from top of tree down
Caterpillar of Tussock Moth
>
Ends of twigs die and fall off.
Cicadas
>
Fruit falls, crescent –shaped cuts in skin of fruit
Curculios
>
Foliage and fruit disappears below ten feet
Deer
>
Leaves and twigs webbed together
Fall Webworms
>
Small misshapen fruits
Fruit Fly Larvae
>
Holes in the leaves
Japanese Beetles
>
Holes in flowers; leaves rolled up
Leafrollers
>
Cottony white masses on roots, stems, branches leaves; reduced plant vigor
Mealybugs
>
Mottled, crinkled foliage; brown specks appear on fruit, and plants may droop and die prematurely
Mosaic Viruses
>
Plant stunted, leaves yellowed, lesions on roots
Nematodes
>
Reddish areas in spring appear on developing leaves, become thickened and puckered, causing leaves to curl. Then areas turn yellowish and then grayish white
Peach Leaf Curl
>
White spots on leaves; eventually entire leaf is covered with powdery substance
Powdery Mildew
>
Leaves yellow, drop; bumps on leaves and stems; sometimes sticky material on leaves
Scale
>
Black sooty mold on honeydew made sucking insects leaving "clear, sweet, sticky" residue on leaf surface.
Sooty Mold
>
Leaves stippled, yellow, dirty; webbing on interior stems of plant
Spider Mites
>
Webbed nest in tree branches filled with caterpillars
Tent Caterpillars
>
Leaves discolored; black fecal spots on underside of leaf.
Thrips
>
Yellowing of foliage and gradual defoliation; plants may become stunted
Verticillium Wilt
>