Weidhaas, J.A.
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Plantation Research: XIV. Studies on the predation of pine needle scale, Phenacaspis pinifoliae (Fitch), by the Coccinellid, Chilocorus stigma (Say). 1976. DeBoo, R.F.; Weidhaas, J.A. Chemical Control Research Institute, Ottawa, Ontario. Information Report CC-X-119. 23 p.
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Plantation Research: IX. Chemical Control of Pine Needle Scale, Phenacaspis pinifoliae (Fitch) (Homoptera: Diaspididae), in Christmas Tree Plantations. 1973. DeBoo, R.F.; Weidhaas, J.A. Canadian Forestry Service, Chemical Control Research Institute, Ottawa, Ontario. Information Reports CC-X-42. 29 p.
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Cornell Christmas tree pest control recommendations. 1964. DeBoo, R.F.; Weidhaas, J.A.; Sinclair, W.A. New York State of Agriculture, Cornell University. 10p.
DeBoo, R.F.; Weidhaas, J.A.; Sinclair, W.A.
Year: 1964
Catalog ID: 35514
Issued by: Great Lakes Forestry Centre
Availability: PDF (request by e-mail)