Soil applications of the systemic insecticide imidacloprid can also be used to protect plants that are at high risk of injury. Imidacloprid is applied as a soil drench to the roots and requires 2-3 weeks before it moves in sufficient concentration hand to leaves so that it can provide protection; applications need to be made prior to periods of expected adult feeding in early summer. Unless the formulation specifically allows the use, imidacloprid should not be applied to plants that are grown for food. Its use is also discouraged on plants that later in the season will produce flowers that are visited by pollinating insects.
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