Friday, May 18, 2012
Galls on pecan stems
At budbreak the eggs hatch and "stem mothers" crawl out to the emerging pecan buds. Once she finds green tissue, a stem mother begins to feed on plant sap, secreting a compound that caused the tree to grown a gall over the insect. After the gall is formed stem mothers lay eggs inside their galls. These eggs hatched into the winged form of the insect.
If you see a tree infested with pecan stem phylloxera, mark that tree now. Next spring, spray only the marked trees.
The pecan leaf phylloxera is a related species that creates galls on pecan leaf blades. The control timing for pecan leaf phylloxera is at leaf burst; so make sure you identify which species is attacking your trees before planning insecticide treatments for next spring.