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Ovicidal Effects of Lorsban and Dimilin on Peachtree Borer Eggs, 1979


 Proper timing of insecticide applications for effective peachtree borer (PBC) control is very important. Peachtree borer larvae are well protected and virtually unaffected by insecticides once they burrow into the bark and establish their feeding chennefs in the cambium tissue of the tree (unpublished data). Controls must be aimed at the vulnerable eggs and young larvae before they enter the tree. Lorsban and dimilin were tested in the laboratory for their ovicidal capabilities on PTB eggs and to determine if timing of applications was Important. PTB eggs were obtained via the collection of viable pupae from infested peach orchards. These were brought into the laboratory and held in sand-filled trays until adults emerged. Eclosed females were taken to the orchard, mated with wild males, then returned to the laboratory and placed on moist filter paper in disposable 4 inch plastic petri dishes. Females were allowed to oviposit for 24 hr. Chemicals were applied to the filter paper by a laboratory aerosol mister to wet either one day (-1) prior to or 3 days (+3) after oviposition. The test was replicated 3 times.