Abstract
This paper reports influences of rodent pests on forest regeneration in northeastern China and methods, other than toxicants, to reduce feeding damage to trees by the red-backed vole (Clethrionomys rufocanus). Studies were conducted in 7- to 8-year-old plantations of Scotch pine (Pinus sylvestris) at NanGou Forest Farm, 15 km southeast of Langxiang, Heilongjiang Province. Stem analysis indicated that radial growth was reduced 27.5 % and height growth 30.5% in damaged (sub-lethal) versus undamaged trees. Synthetic predator odour repellents based on weasel (Mustela erminea) anal-gland secretion significantly reduced damage whereas red fox (Vulpes vulpes) components did not. Alternative foods composed of Korean pine (P. koraiensis) bark mulch, soybean oil, and wax significantly reduced damage in terms of feeding attacks and complete girdling. A sound silvicultural approach to rodent pest management could include repellents in combination with alternative foods. These tactics may be enhanced through alteration of vole habitat by reduction of vegetative competition in young stands.
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