Abstract
Aesthetic injury levels (AIL) were calculated for two spotted spider mites, Tetranychus urticae Koch, on Euonymus alatus (Thunberg) 'Compacta'. Methods were developed for sampling T. urticae and assessing its ability to discolor plant leaves in the landscape. Cumulative estimates of spider mite density more consistently predicted changes in the discoloration of plant leaves than did seasonal peak estimates of spider mite density. A survey of 134 retail nursery customers showed 50% of the respondents thought that plants with a change of < 5% leaf discoloration were damaged. A model was developed that predicted retail customer dissatisfaction with plants from cumulative spider mite densities. As the cost associated with a management strategy increased, more customers were likely to be dissatisfied with a plant managed at a given AIL. The utility of an AIL for common management strategies is discussed.
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