Abstract
Aceria mississippiensis andCoptophylla caroliniani (Prostigmata: Eriophyidiae) were found on wild geranium,Geranium carolinianum L., in northern Mississippi. About onehalf of the total developmental time was spent in the egg stage for each species. The developmental threshold forA. mississippiensis was 5.5±1.04°C and 7.3±0.93°C forC. caroliniani. The optimum temperature for each developmental stage was between 25 and 29°C.C. caroliniani failed to develop at 36°C, whereasA. mississippiensis failed at 40°C. Day-degree requirements to complete development were 100.7±3.6 Do and 154.6±4.1 Do forC. caroliniani andA. mississippiensis, respectively.
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