Abstract
From 1977 to 1979, the efficacy and residual activity of disulfoton G and aldicarb G were compared when applied to pecans grown under and southwestern U.S. conditions for control of Monellia caryella (Fitch) season-long population reduction was obtained with aldicarb at rates from 2.80 to 11.50 kg of AI/ha. Disulfoton was more effective at 3.36 than at 2.24 kg of AI/ha, but neither rate approached aldicarb in effectiveness under irrigated conditions. Differential solubility of the two materials is proposed as an explanation of erratic control achieved with disulfoton. No significant effects were observed of controlled vs. uncontrolled blackmargined aphid populations on pecan Yield (kg of nuts per tree). Similarly, no effects were observed on quality components, i.e., weight per nut, volume per nut, percentage of kernel, etc., or on tree growth when measured as trunk cross-sectional area. No cumulative effects of controlled vs. uncontrolled aphid populations over a 2-year period were observed.
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