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Potenital use of baited pitfall traps in monitoring pine root weevil, Hylobius pales, Pachylobius picivorus, and Hylobius radicis (Coleoptera: Curculionidae) populations and infestation levels



Potenital use of baited pitfall traps in monitoring pine root weevil, Hylobius pales, Pachylobius picivorus, and Hylobius radicis (Coleoptera: Curculionidae) populations and infestation levels



Journal of economic entomology 86(2): 475-485



Plantation pine production in the Lake States is limited by a root weevil complex composed of the pales weevil, Hylobius pales (Herbst); pitch-eating weevil, Pachylobius picivorus (Germar); and pine root collar weevil, H. radicis Buchanan. Population changes were monitored over two growing seasons using pitfall traps baited with ethanol and turpentine in Christmas tree farms. Density-dependent factors affected population change, particularly among H. pales, The number of weevils per trap did not vary consistently across three pitfall trap densities. Weevil distribution patterns, and correlations between trap catch and damage, were analyzed. Trap catch in 1988 of female H. pales was positively correlated with infestation level and infestation severity in 1988, 1989, and 1990. Trap catch in 1989 of P. picivorus was significantly correlated with 1988, 1989, and 1990 foliar symptoms. The role of host finding with respect to weevil distribution, the significance of the trap catch-damage relationship, and the predictive potential of the monitoring system are discussed.

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Accession: 013175097

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