Correlation between Bactrocera dorsalis (Hendel) (Diptera: Tephritidae) trap catches and guava fruit infestation in Taiwan

Present study compiled capture data of male fruit flies (Bactrocera dorsalis) attracted to methyl eugenol and female fruit flies attracted to protein bait from 7-year data from a guava orchard in Taichung and 2-year data from a guava orchard in Pingtung, Taiwan. Linear regression analysis revealed that female and male catch data were positively correlated. Male catch data explained 41.9% of variation from female capture data from 2002 to 2007 in Taichung, Taiwan. The results from the Taichung and Pingtung sites during 2010–2012 yielded R² of 0.204 and 0.305, respectively, calculated using linear regression equations. To investigate the correlation between data from female fruit fly trap catches and fruit infestation, the number of females captured were divided into ten sequential classes, ranging from 0 to 16 females. The logistic regression analysis demonstrated that for each unit increase in the female classes, the odds ratio of fruit infestation was 1.345.