Date of this Version
It is unfortunate that the development of rodenticide products has not kept pace with other orchard needs. This may be due to 1) long term availability of an inexpensive material, 2) return-on-investment for development costs of new products in lieu of this availability. A critical situation is developing in that the standard material is not performing as well as it did in the past. This may be related to the development of areas of resistance and the increase in pine vole activity.