Photo Curtesy of UMass ExtensionRecently I have come to realize that my biggest problems are generally self created by ignoring the warning signs when they were small problems. My Pieris japonica var. yakushimanum ‘Prelude’ has been hit hard by the Andromeda Lace Bug Stephanitis takeyai for two years in a row, my treatment plan has been limited to spraying horticultural oil just prior to June 1st in my Massachusetts garden and then to be frank I become lazy, forgetful, and disinterested by midsummer and follow up by doing nothing.
The Andromeda Lace Bug Stephanitis takeyai is a non native insect from Japan that was thought to have been brought over on a plant. Stephanitis takeyai has adapted very well to my zone 7a environment and according to the University of Massachusetts Extension there will be as many as three to four generations of this insect in one season(May though September). One of the things that makes combating this insect so difficult is the mother lays the eggs inside the tissue of the underside of the leaf and then protects the egg further by sealing it with a shellac like substance.
My plan of action is to begin spraying the undersides of all leaves but particularly those closest to the ground with horticultural oil or insecticidal soap (undecided which might do a better job) to eliminate as many nymphs as possible and repeat this once every two weeks eliminating new generations of eggs until the end of September.
