Xylosandrus germanus (Blandford) is an invasive species of ambrosia beetle known to attack apple trees in North America. Xylosandrus germanus are attracted to ethanol produced by stressed and injured trees and can be a serious problem when grafting a new cultivar onto established fruit trees (topworking). The objective of this study was to evaluate the efficacy of 2 insecticides (emamectin benzoate and azadirachtin) and injection timing (fall and spring) on their ability to control X. germanus colonization in apple trees with simulated topworking. Our study shows evidence that both emamectin benzoate and azadirachtin injections can reduce X. germanus infestations; however, our results were inconsistent. The timing of injections influenced X. germanus, with spring injected azadirachtin being more effective than fall injections. Residue analyses of emamectin benzoate and azadirachtin showed the presence of residues in woody tissue comparable to those found in leaves.

This trial was conducted to evaluate the efficacy of spray programs, including the insecticide Grandevo at various rates and formulations against spotted wing drosophila (SWD) in blueberry. Six-bush plots were established in a mature ‘Jersey’ blueberry planting (row spacing 12 ′ × 4 ′ ) located at the Research Center in MI. Treatment plots were replicated four times and set up in an RCB design. Applications began 29 Jul at first SWD trap catch with ripe fruit and were repeated weekly for 3 to 5 wk. Test materials were applied with an FMC 1029 airblast sprayer calibrated to deliver 50 GPA at 2.5 mph. No foliar maintenance pesticides were applied to the test plots during the trial. Fruits were hand-harvested on 3, 10, and 17 Aug. One pound