Walnut Twig Beetle (Coleoptera: Curculionidae: Scolytinae) Colonization of Eastern Black Walnut Nursery Trees.

The generalized linear mixed-effects modeling revealed that the interaction between the two basal diameter sizes and the presence of the pheromone was highly significant ( F 1,20 = Infinity, P < 0.001).

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Although there appears to be a significant trend of increased colonization on the larger diameter, pheromone lure baited trees ( Fig. 2 ), the power of the statistical models was heavily influenced by the large number of zeros and small number of counts within the data.

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