Relationship Between Densities of Pear Psylla and Twospotted Spider Mite and Pear Leaf Nutrient Levels

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David Sugar Oregon State University, Southern Oregon Experiment Station, 569 Hanley Rd., Medford, OR 97502

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T. L. Righetti Oregon State University, Southern Oregon Experiment Station, 569 Hanley Rd., Medford, OR 97502

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P. H. Westigard Oregon State University, Southern Oregon Experiment Station, 569 Hanley Rd., Medford, OR 97502

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David Sugar Oregon State University, Southern Oregon Experiment Station, 569 Hanley Rd., Medford, OR 97502

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T. L. Righetti Oregon State University, Southern Oregon Experiment Station, 569 Hanley Rd., Medford, OR 97502

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P. H. Westigard Oregon State University, Southern Oregon Experiment Station, 569 Hanley Rd., Medford, OR 97502

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Contributor Notes

Dept. of Horticulture, Oregon State Univ., Corvallis, OR 97331.

Received for publication 3 May 1988. Oregon State Univ. Agricultural Experiment Station Technical Paper no. 8633. We are grateful for the technical assistance of R.B. Allen and Kate Powers. This research was supported in part by a grant from the Oregon Agricultural Research Foundation. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.

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