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马尾松用材林防治毛虫的经济效益十分显著,但马尾松薪炭林的情况怎样呢?我们于1 986年在余江县春涛乡进行了初步试验。一、试验方法选两块立地条件、下木、地被物,林分组成和郁闭度相似,树龄相同或相近的马尾松毛虫高虫口松林为试验地,面积各1 5亩左右,对其中一块进行全面彻底防治,另一块不防治。(两块试验地隔2.5米宽的机耕道)防治前对两块试验地虫口密度、虫情级、松针保存率、平均树高等进行详细调查。待松毛虫结茧后调查两块试
The economic benefits of using Pinus massoniana forest to control caterpillars are very significant, but what about the case of Pinus massoniana forest? We conducted a preliminary test in 1986 in Chun Tao, Yujiang County. First, the test method Select two site conditions, understory, ground cover, forest composition and canopy density similar age of the same or similar Dendrolimus punctatus population of high population mound pineland, with an area of about 15 mu, of which A complete prevention and treatment, the other one is not prevention and treatment. (Two tractors with a width of 2.5 m) were thoroughly investigated before the treatment in terms of population density, worm level, preservation rate of pine needles and average tree height. Dendrolimus cocoons after the two trials to be investigated