Experiments on the Control of Mites Infesting Raspberries1

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Abstract
A description of damage, survey of distribution, and indication of loss sustained from mites, particularly Tetranychus mcdanieli McGregor, on raspberries in Michigan, together with control measures attempted and results attained. The distinguishing characteristics of T. mcdanieli are included and the observed habits of the mite detailed. Control studies with dormant and summer oils, glue, and contact poisons of plant origin alone and in combination are recounted. The effect of single applications and of series applications on different stages of T. mcdanieli are compared. A series of three sprays of summer oil at one per cent strength reduced the mite population to an extremely low figure in May 1931, while an identical series of sprays applied just after the leaves came out in 1932 protected raspberries from damage by mites. Raspberry foliage is apparently entirely tolerant to sprays of one per cent summer oils.

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