Control of San Jose Scale in Apple, 2016*

The objective of this study was to evaluate the efficacy of several insecticide rates and timings against SJS on apple. Two-tree plots were established in a 29-yr-old “Red Delicious” apple planting (row spacing 20′ × 18′) located at the Trevor Nichols Research Center in Fennville, MI (Green Block). There were four replicated plots per treatment in an RCB design. Test materials were applied with a FMC 1029 tractor-mounted airblast sprayer calibrated to deliver 100 gpa at 2.5 mph (Table 1). In addition, foliar maintenance applications of Penncozeb, Flint, Luna Tranquility, Captan, Asana XL, Lannate, Syllit, Alion, Delegate, Inspire Super, and Vangard. Also, 2, 4-D Weedar was banded below the trees for weed control. SJS damage was assessed in situ on 20 Jun by counting the number of scale-infested fruit on 100 randomly selected fruit per plot. Data were analyzed using ANOVA and means separation by Tukey’s HSD at P > 0.05. ANOVA was run on transformed data, while actual counts are presented.

The Sivanto (half-inch green), Sivanto/Movento and Lorsban treatments all significantly reduced the incidence of SJS injury to fruit (Table 1).

Author notes