Sampling of Diaphorina citri (Homoptera: Psyllidae) on orange jessamine in Southern Florida
Abstract
Dispersion indices and related statistics of Asian citrus psyllid, Diaphorina citri Kuwayama, on orange jessamine [Murraya paniculata (L.) Jack] shoots in southern Florida from 1998 to 1999 were determined with 235 data sets and used to develop sampling plans. Three regression models, Taylor's power law, Iwao's patchiness regression, and k = c +dm [k = m2 / (S2 - m)] (where k is the parameter for the negative binomial distribution) were used to analyze the data. Taylor's power law (a = 0.3407 0.03, b = 1.2971 0.03, r2 = 0.88) fit the data better than Iwao's model (a = -0.3217 0.12, = 1.6979 0.06, r2 = 0.76). Taylor's b and Iwao's were both significantly > 1, indicating that D. citri populations were aggregated. Iwao's a was significantlyDownloads
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