Induced increase of soft scale: Imbalance between scales and natural enemies on walnut trees in northern California results in scale population increases
California Agriculture 12(11):13-13.
Published November 01, 1958
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The principal natural enemies of soft scales attacking walnut trees in northern California are small winged parasites easily killed by trace amounts of insecticides. If undisturbed, the parasites are able to maintain the scale population much below an economic level.