湖北林业科技

This study investigated the residual dynamics of three trunk-injected formulations—10% emamectin benzoate imidacloprid (T1), 3.4% emamectin benzoate microemulsion (T2), and 5% abamectin emulsifiable concentrate (T3)—in Pinus massoniana,along with their control efficacy against Monochamus alternatus and pine wilt disease (PWD) itself. All three tested formulations exhibited a distribution characteristic of base enrichment and gradual decrease toward the top,with residual levels decreasing over time. 12 months post-injection, the overall residual amount of T1 was significantly higher than that of the other treatments. Trunk injection significantly reduced the population density of M. alternatus during its peak period; both T1 and T2 achieved a population inhibition rate exceeding 50%,which was significantly superior to T3. All trunk injections remarkably reduced the mortality of P. massoniana. The mortality rate of the blank control group ranged from 7.05‰ to 8.89‰,while the T1 group retained the lowest tree mortality with a minimum of 1.02‰. In conclusion,10% emamectin benzoate imidacloprid exhibits the most optimal comprehensive performance regarding residue persistence,vector suppression, and tree protection,indicating promising potential for widespread application.