Aphids also produce a sticky substance called honeydew, which encourages fungus and attracts ants. Or, spray with malathion, diazinon, or plain, soapy water. Prune away infected shoots. A major pest in the Bay Area, these white larvae feed beneath the bark of stone fruit trees. Trees may be completely girdled.
Productivity is reduced and trees are susceptible to disease.
In late summer apply moth crystals around the base of tree and cover with three to four inches of soil, mounding it against the trunk. Or, spray with diazinon, carbaryl or lindane products. They feed on roots just below the soil, which results in wilted leaves and stunted growth. Spray with garlic concentrate or garlic-pepper spray. Or, drench soil with diazinon before planting.