Some Factors Affecting the Balance of Phytophagous and Predacious Mites on Apple in South-East England

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Abstract
A study of the importance of predators of the Fruit Tree Red Spider Mite, Metatelranychus ulmi (Koch), in Nova Scotian orchards twenty years ago led Gilliatt (1935) to conclude that another mite, Seiulus pomi Parrott, predacious on M. ulmi, was a major factor in the control of the latter under suitable conditions. S. pomi, however, was found to be very susceptible to the winter oil and lime-sulphur sprays applied as a routine at that time, and was unable to prevent increases of M. ulmi in such orchards. Similar increases of M. ulmi in Ohio orchards receiving sulphur sprays were attributed by Cutright (1944) to the greater susceptibility of predacious mites to this chemical.

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