Systox on Walnuts in Northern California

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Abstract
Systox at the rates of 0.62, 1.25 and 2.50 lb. of actual ingredient per acre applied in a single appln. to Payne walnuts on May 10 resulted in excellent control of the walnut aphid for the entire season. At and shortly before harvest, aphids were able to colonize on the old foliage and the degree to which this occurred was in proportion to the dosage. By early summer the aphid was able to establish colonies on new growth. At all dosages the Systox showed evidence of controlling spider mites. At the highest dosage what appeared to be serious foliage injury occurred on the north half of the trees, but this apparently did not reduce the quality of the nuts. No off flavor could be detected even at the highest rate at which Systox was applied.

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