Answer: Aphid populations can soar in a hurry because during spring and summer, all aphids are female who bear live young, which are capable of bearing live young in no time at all! You can have three or more generations feeding on the same plant at the same time! Of the natural predators, lady beetles top the least. Aphid midges and lacewings are next on the list. You may have to resort to sprays if natural predators fail to keep the aphids in check. You can use a horticultural oil spray in the winter to smother the eggs on the oak trees, or use an insecticidal soap against the aphids now. Don't release predators and then spray or you may do in the good guys along with the bad!
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