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January 1, 1920Journal of Pomology and Horticultural Science

The Woolly Aphid of the Apple and Elm.

Fred. V. Theobald

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Abstract

(1920). The Woolly Aphid of the Apple and Elm. Journal of Pomology and Horticultural Science: Vol. 2, No. 2, pp. 73-92.

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Fred. V. Theobald (1920) studied this question.

synapsesocial.com/papers/6aa887defc4a97feb2b44082 https://doi.org/10.1080/03683621.1920.11513236

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