Analyzing the relationship between joint fruit sorting & inspection results of thrips damage and production history in a joint sorting system of fig ‘Masui Dauphin’

Abstract

In this study, we analyzed the production history of figs in Anjo City and Hekinan City in 2020 and 2021 to delineate the relationship between pest control against thrips in fig farms and the time of fruit inspection: early or late (before shipment) using a joint fruit sorting system. The target variables in the regression analyses were “the time (in days) between the three-fruit inspection done for the produce earliest in the relevant year and the subsequent three-fruit inspections for each produce (hereafter, the difference from the earliest passing date) ”. We then used a generalized linear mixed model for each item related to drug distribution as an explanatory variable with a negative binomial distribution as an error structure, and test locations as a random effect (Anjo and Hekinan). The results suggested that “the difference from the earliest passing date” can be predicted by “the spraying interval”.