Intratree Regression Sampling Plans for the Citrus Red Mite (Acari: Tetranychidae) on Lemons in Southern California

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Abstract
Two sampling plans were developed to estimate rapidly populations of the citrus red mite, Panonychus citri (McGregor), within a tree. The first plan relies on the concept of a stable age distribution to allow prediction of the total population in a sample from the number of adult females. The second sampling plan is based on an infested-leaf index which predicts the total population of a sample from the proportion of leaves infested with at least one adult female on the lower surface. Both sampling plans reduce the time required to estimate populations and have applications in pest management and research on economic injury, where population levels must be monitored to determine their relationship to yield reductions.