REFINEMENT OF A SPRAY TIMING TECHNIQUE FOR THE NANTUCKET PINE TIP MOTH (LEPIDOPTERA: TORTRICIDAE)

Application of dimethoate on various spray dates enabled a refinement of a spray timing technique for control of the third generation of Nantucket pine tip moth. Two spray applications were necessary for adequate control but proper timing of the first application was found to be more critical. Optimal control was achieved when the first spray was applied at 520 degree days after the onset of male moth flight. Optimal dates generally coincided with peak egg densities.

Although a few eggs and early instar larvae were found after the completion of the third generation of tip moth, no extended survival, damage or other indication of a fourth generation was recorded.