Studies on Resistance of Strawberries to Mites. I. Effects of Plant Nitrogen12

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Abstract
Five strawberry clones, including 2 commercial varieties and 3 selections, that varied in resistance to the two-spotted spider mite, Tetranychus urticae Koch, were greenhouse grown in nutrient culture at 4 levels of nutrition. Significant positive correlations between foliage nitrogen and mite injury were shown, both by treatment and by clone, as well as between absorbed nitrogen and mite fecundity in the fall. Amino acid analyses of mite carcasses revealed a negative correlation with mite fecundity when amino acids previously determined as nonessential to T. urticae were considered, and some explanations are offered. Preliminary studies in seasonal influence on resistance showed that foliage produced during the summer months by all clones was relatively resistant.

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