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, just as the new foliage emerges, as a preventative measure.shrubs, roses spring, summerCommon problems affecting trees and shrubsAcer tar spotLeaf miner flyReversionPowdery mildew

containing imidacloprid or thiacloprid.euonymusmid-July, early September, winterMore common garden pestsWhiteflyLeaf miner flyMealybugsAphids

This fungal problem results in rounded spots on the leaves. Although it's unsightly, leaf spot is only a significant problem on poorly growing or unhealthy plants, which might end up dropping a substantial number of leaves.A fungal attack causes

, or thiacloprid.virtually anything from tomatoes to honeysuckleearly spring to autumnDealing with other garden pestsWoolly aphidsWhiteflyPear leaf blister miteLeafhopper