The objective of this study was to evaluate the efficacy of severalinsecticides and timings against San Jose scale (SJS) on Georgiapeaches. Single-tree plots were established in a 9-yr-old plantingof ‘Springprince’ peach trees with a row spacing of 20 ft × 18 ft;located at the Fort Valley State University research farm in FortValley, GA. A total of 11 treatments were evaluated and replicatedfour times each in an RCB design with at least one buffer treeseparating all plots. All treatments were applied using a backpackCO2 Sprayer (Bellspray, Inc.) with a single-nozzle boom calibratedto deliver 100 gpa at 40 psi (Table 1). Treatment applications wereinitiated at delayed-dormant timing on 26 Feb, shuck off on 6 Apr,and then followed a schedule based on the first and second peakactivity events for the SJS immature stage, or ‘crawlers’ (Table 1).The crawlers were monitored starting on 24 Apr 2019, proceedingon a weekly basis through harvest until 23 Aug 2019 with a pieceof double-sided tape positioned over a strip of black electrical tapeand wrapped around an infested branch. Two monitoring tapeswere deployed per sampling tree and were removed and replacedon a weekly basis. The number of SJS crawlers on each tape(adjusted to per 5 cm of tape) were counted using a stereomicroscope.Due to a late freeze, we were unable to assess fruit injury.The mean abundance of crawlers per 5 cm of tape at pre-harvest(24 Apr through 28 Jun 2019) and seasonal summation (24 Aprthrough 23 Aug 2019) were compared across the 11 treatmentsusing ANOVA (data were natural log-transformed) and meansseparation with Student’s t (P 0.05).
展开▼
