The combination of controlling insects and resin tapping provides a well way to apply the method for a longer period.
治虫和采松脂相结合，更是为长时期采用这种方法提供了良好的途径。
During resin tapping, the cover is closed to cover resin liquid to avoid the infiltration of impurities and the volatilization of the resin liquid.
采脂时，将盖封闭盖住脂液，避免了杂质的渗入和脂液的挥发。
These were tree age, stand density, resin tapping, rainfall, temperature, clay soil, stone soil, soil depth, water logging, and other diseases and insect pests.
它们是树龄、林分密度、割脂、降雨量、温度、粘性土、石砾土、土层瘠薄、积水、病虫危害。
These were tree age, stand density, resin tapping, rainfall, temperature, clay soil, stone soil, soil depth, water logging, and other diseases and insect pests.
它们是树龄、林分密度、割脂、降雨量、温度、粘性土、石砾土、土层瘠薄、积水、病虫危害。
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