Excerpt from Fifteenth Annual Report of the State Entomologist of Montana
Pear - Leaf Blister Mite (eriophyes pyri Pagnat). Pear-leaf blis ter-mite was reported as being injurious to apples in the Bitter Root Valley and other localities in the western part of the State. Some ... control experiments against this insect were carried on in conjunction with the State Board of Horticulture. As had been previously dis covered. Lime sulphur, sprayed when the buds were swelling, gave satisfactory results.'
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