Abstract:

In recent years, the sweet potato weevil has become more and more severe in Quzhou city, and the epidemic area centered around the origin of Shilifeng in Qujiang District and has spread to the entire Quzhou City and even the surrounding areas, seriously threatening the development of the sweet potato industry in Quzhou City and even Zhejiang Province. In this study, the population density and growth dynamics of sweet potato weevils in the field were monitored by sexual attractant trapping, and the characteristics and causes of sweet potato weevils in the field were analyzed, and the differences in the damage of weevils of different sweet potato varieties were compared. The results showed that in 2019, the peak occurrence of sweet potato weevils in Qujiang District was from October to November, and the peak was at the end of October. Temperature is an important factor affecting the growth of weevils, and the dynamics of sweet potato weevils are negatively correlated with the average temperature. Qushu 2, the cultivar with the best precociousness and the shallowest potato setting in this study, had the largest weevil trapping rate (1 229) and the most serious tuber damage rate (85.71%).

Key words: sweet potato weevil, regularity of occurrence, tuber damage rate