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Proceedings of the International Plant Propagator's Society

Vol. 42

Control of Two-Spotted Mite by Predatory Mites

Richard Llewellyn

pp: 108-113


The Two-Spotted Mite (TSM)—Tetranychus urticae. Two-spotted mite belongs to a group of eight legged plant-eating mites. The young and older mites are pale green with two dark patches on their backs. The adults are about half a millimeter in length and are best viewed with a hand lens. Their eggs are round and pearly white. Two-spotted mites suck out the cells in the leaf, causing minute, yellowish, feeding marks which may join together causing leaves to shrivel and die. Once damage occurs, it will remain, as the leaf cannot repair itself.

Two-spotted mite is a major pest of a wide range of horticultural crops. Nurserymen can suffer serious losses due to the leaf scarring and stunted growth that these mites cause. Chemical controls have been the norm until the last few years. These are becoming less reliable as mites have developed high levels of resistance to some, and at least some resistance to most, chemicals. This process has been accelerated in recent years with

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