University of California
The California Backyard Orchard
California Red Scale Winding Down
The graph below shows the male California red scale pheromone trap catches (green) and the crawler tape catches (red) for a citrus orchard at Lindcove. The scale activity is finally starting to wind down as the night temperatures cool. Male flights peaked at Lindcove this year during March, mid-mid June, late July and early September. Four generations of crawler activity occurred during Mid May, early July, mid-August, and late September. The male flight and crawler activity seems to be winding down now. It may pick up a bit if the daytime weather stays warm, but usually the females stop producing crawlers around November 1.
California red scale data for Lindcove 2012