Leaf nitrogen and position in relation to population parameters of pacific spider mite, Tetranychus pacificus (Acari: Tetranychidae) on grapes
1988
Wilson, L.T. | Smilanick, J.M. | Hoffmann, M.P. | Flaherty, D.L. | Ruiz, S.M.
In greenhouse studies, four nitrogen (N) rates were applied to potted grape plants. Foliar N increased significantly as applied N increased, and there were significant differences in N content between leaves taken from lower, middle, and upper node locations on the vines. In leaf cages, Tetranychus pacificus (McGregor) responded to increasing foliar N with significantly (P less than 0.05) increased fecundity and shorter immature developmental time only during the second year of the study. There appeared to be no relationship between foliar N and immature survivorship, ovipositional duration, or female longevity.
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