U.S. DEPT. OF AGRICULTURE. ANIMAL AND PLANT HEALTH INSPECTION SERVICE
The success of crown-baiting over other rat control methods in rapidly reducing damage and maintaining low damage levels to coconut crops is related to two factors (Fiedler et al., 1982).
Hoque, Melanda M.; Fiedler, Lynwood A. · 1970

Abstract
First, crown-baiting selectively kills only those rats that climb palms and damage nuts, thereby reducing bait material, labor, and total cost. Second, the bait used is highly preferred over growing nuts by rats, which are basically cereal eaters. Therefore, the crown-baiting approach holds the greatest potential for highly cost-effective protection of coconut from rats in the Philippines. Difficulty in crown-baiting may occur in areas with older, taller palms. However, a long bamboo pole, commonly used by coconut harvesters, may be used to place baits in the palm crowns. (Author abstract/
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USAID DEC