Grijpma, P., and W. Schuring. 1984b. Vergelijking van twee insekticide-lokstof combinaties op vangstammen voor bestrijding van de letterzetter (Ips typographus) [Comparison of two insecticide-pheromone combinations on trap trees for the control of the spruce bark beetle] . Nederlands Bosbouwtijdschrift 56:295-302.
Grijpma & Schuring 1984
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