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EVALUATION OF MITICIDES FOR CONTROL OF EUROPEAN RED MITE, 2012

Several blocks within a research orchard containing ‘Red Delicious’ trees were managed in an attempt to flare European Red Mites. Due to the sporadic nature of this pest in this block, applications of the pyrethroid Asana XL 0.66EC (12.0 oz/acre) were applied several times, as well as Lannate 2.4LV (2.25 pt/acre) in an effort to flare the ERM. The field scouting measure as defined by the Cornell Guidelines for Tree Fruit Production were used to determine early season development, followed by leaf samples taken into the laboratory. These leaves were brushed with with a mite-brushing machine and then counted under a microscope. ERM motiles, ERM eggs and motile phytoseiids were evaluated. Miticides were applied once threshold had been reached with a Durand-Wayland air-blast sprayer at 100 gpa on 31 Jul. Treatments, including an untreated check, were replicated 3 times and arranged in a RCB design. Data was subjected to an AOV with JMP. Means were separated with Student’s t-test. After several weeks of little to no development of ERM after being exposed to the Asana XL 0.66EC, (applied 17 May, 31 May, 14 Jun, 29 Jun) it was determined that phytoseiid populations in the research orchard were more than likely not being affected by this material. Research has shown that most populations of phytoseiids are extrememly sensitive to this class of chemicals, breaking down bio-control measures and allowing ERM to build populations. An application of Lannate 2.4LV(19 Jul) was then used to try and disrupt the biological control. Within several days after the application, very few predators remained and ERM numbers rose. The relatively hot and dry 2012 growing season provided ideal conditions for ERM population growth in mid to late summer. Once populations rose above threshold levels, several miticides were applied for efficacy evaluation. A complete list of materials is listed in Table 1. All treatments provided very good initial control approximately one week after treatment, which lasted throughout the remainder of the season. Even though ERM populations declined later in the season in August in the check plots, counts in all treatments remained significantly lower on all sampling dates. Because these applications were later in the growing season than had been expected, counts were taken weekly after the treatment for only 4 weeks. ERM egg numbers were also intially significantly reduced in all treatments, although eggs densities increased in the 13 Aug. samples and were not significantly different among treatments and check plots. On the last sampling date of 29 Aug numbers of eggs were significantly lower in both Nealta treatments and in the Envidor 2SC plots. Phytoseiid mite counts in both the treatments and check plots never returned to pre-Lannate application (19 Jul) numbers.