A decade ago, the western grape leafhopper was known to exist in British Columbia only on the east side of the Okanagan Valley, from Penticton south to the Canada-U.S. border. Today, reports of the pest are coming from the west side of the valley and north of Penticton, highlighting the failure of traditional control measures to stop the pest’s spread. While several pesticides are effective against the Virginia creeper leafhopper, the same products aren’t necessarily effective against the western grape leafhopper and in some cases may even eliminate natural enemies such as members of the Anagrus group of wasps. Dr. […]