Twospotted spider mite damage was detected on the leaves of day-neutral strawberry plants under the low-tunnel system in late July. While the damage was slight, it certainly came as a surprise since we did not experience this type of insect problem in 2013 with our low-tunnel system. Typically, the twospotted spider mite is found in very warm environments, such as a high tunnel or greenhouses.
Twospotted spider mite damage to strawberries appears as stippling, scarring, and bronzing of the leaves and calyx. To control the mites, organic insecticide applications of Oxidate at 1 oz per 1 gallon of water was applied on a weekly basis.
The mites were detected prior to harvest; no mites were found in the non-low tunnel treatment.