A two year study of the physical and economic impact of voles (Microtus montanus) on mixed maturity ...

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" A two year study of the physical and economic impact of voles (Microtus montanus) on mixed maturity apple (Malus spp.) orchards in the Pacific northwestern United States "
Askham, Leonard R.

Document Type	:	AL
Record Number	:	942843
Doc. No	:	LA8sn89886
Language of Document	:	English
Main Entry	:	Askham, Leonard R.
Title & Author	:	A two year study of the physical and economic impact of voles (Microtus montanus) on mixed maturity apple (Malus spp.) orchards in the Pacific northwestern United States [Article]\ Askham, Leonard R.
Title of Periodical	:	Proceedings of the Vertebrate Pest Conference
Volume/ Issue Number	:	13
Date	:	1988
Abstract	:	The physical impact of voles in agriculture and forestry has been duly noted by many researchers around the world. The economic impact of the various species, however, has not received much attention other than to note that losses from these animals can be substantial when population levels become high. This study assesses the economic impact of an extremely high population of Microtus montanus (mountain voles) in a large apple (Malus sp.) orchard in northcentral Washington State (U.S.A.) over a two-year period. In this study, 200 trees were harvested, weighed, graded, and compared by the amount of visual damage that could be seen above the soil surface. These values were then compared with cash values received by growers for the season. Production was decreased a weighted average of 36% (31% for red delicious and 53% for golden delicious) or