Notes on Rodenticides
Read the section on Orchard Voles before using rodenticide. Registration note: For products that are registered for use under a Special Local Needs (SLN) label, the applicator must have a copy of the SLN label. Check with your state Extension specialist, pesticide dealer, or state pesticide regulatory agency.
Ramik Brown, Ramik Green (diphacinone): (0.005% in weather-resistant bait). As of January, 1996, Ramik Brown had SLN labels in Connecticut, Massachusetts, and New Hampshire. Ramik Green had a SLN label in VT only. Two applications of 10 lbs./acre each. Applications can be made 20-40 days apart. Apply according to specific label directions and limitations. See label for instructions on bait station use. Apply post-harvest.
Rozol, Parapel II (chlorophacinone):(0.005% in paraffinized pellets). As of January, 1996, Rozol pellets had a SLN label in Vermont only. Parapel II had a SLN label in CT only. Apply postharvest, and according to specific label directions and limitations.
Zinc phosphide pellets, or bait formulations - many brand names (2% zinc phosphide in pellet form or on oats or cracked corn): Available in all New England states. Apply 2-3 lbs./A by hand baiting 2-4 holes or trails or 2 bait stations per tree. Use 6-10 lbs./A when broadcast bait applications are made. Follow label instructions. Depending on severity of infestation, repeat application may be needed. Distribute bait after apple harvest, but before leaf fall.
On to Fruit Finish and Phytotoxicity
1996-1997 New England Apple Pest Management Guide