Abstract
AbstractExperiments were conducted on Fraser fir,Abies fraseri(Pursh) Poir, seedlings or cut terminals. Results indicate thatOligonychus ununguis(Jacobi) responds most favorably to temperatures approximating 26 °C and to relative humidity levels approaching 50 to 60%. Developmental time, time to 50% mortality, net reproductive rate, mean generation time, intrinsic rate of natural increase, finite rate of increase, and days for populations to double were computed for each temperature and relative humidity regime. Simulated rainfall severely limits population density on Fraser fir seedlings.
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