Plant Damage & Poosible Causes Damage Leaves curled, webs present Possible Causes Webworms; obliquebanded leafrollers Damage Leaves with numerous, small holes Possible Causes Adult flea beetles; plant diseases Damage Leaves spotted Possible Causes Tarnished plant bugs; spider mites; thrips; lace bugs; plant diseases Damage Leaves or stems speckled or silvery Possible Causes Thrips Damage Leaves and stems with hardened bumps, scales, or cottony growths Possible Causes Scales; mealybugs; plant diseases Damage Leaves with shallow tunnels under leaf surface. Possible Causes Larval leafminers; sawflies Damage Leaves with shiny, slimy, frothy, or sticky coating Possible Causes Aphids; mealybugs; slugs and snails; pear psyllas; scales; spittlebug; whiteflies; plant diseases Damage Fruit with tunnels throughout Possible Causes Apple maggots; moth larvae like codling moths or European corn borers Damage Fruit distorted, twisted Possible Causes European corn borers; tarnished plant bugs Damage Fruit spotted, sticky Possible Causes Aphids; leafhoppers; spittlebugs; plant diseases Damage Rootsor bulbs with signs of feeding or dead spots Possible Causes Wireworms; many kinds of beetle grubs; weevils (black vine, carrot, or strawberryroot weevils) Damage Roots or stems with galls, swellings Possible Causes Gall wasps; nematodes; plant diseases Damage Roots or stemswith excessive branching Possible Causes Nematodes Damage Stems hollowed, with larvae inside and leaves wilted Possible Causes Borers (European corn, flatheaded appletree, fruit, peachtree, roundheaded appletree, and squash vine borers) Damage Flowers eaten Possible Causes Japanese beetles; rose chafers Damage Flowers fall before opening Possible Causes Tarnished plant bugs Damage Seedlings chewed off at soil level Possible Causes Cutworms; animal pests