火炬松、湿地松为常绿乔木,是速生优质的用材树种,可用于低山丘陵造林和庭园绿化.在幼林生长过程中,其主要虫害有松毛虫、松梢螟、小蠹虫.这些害虫吃食针叶、钻蛀枝梢.当火炬松、湿地松的主梢、侧枝被松梢螟、小蠹虫危害后,针叶就会变黄,降低生长量.据1977年5月调查,我所25亩3年生幼林中,火炬松的有虫株率为14.2%,湿地松的有虫株率为4.3%.有的主梢被害,重者一株有9个侧枝被 Pinus taeda and Pinus elliottii are evergreen trees, which are fast-growing and high-quality timber species that can be used in afforestation and landscaping in the hilly areas. The main insect pests include pine caterpillars, pine needles and beetles in the growth of young forests. When the loblolly pine, the main shoots of Pinus elliottii, side branches by the pine tip borer, beetles harm, the needles will turn yellow, reduce the amount of growth.According to the survey in May 1977, I am 25 acres In the 3-year-old young forest, the rate of the insect-producing plantation of Pinus taeda was 14.2% and that of the slash pine was 4.3%, and some of the main shoots were killed,