人工剪梢防治微红梢斑螟对松树生长的影响评价

Estimate of effects on pine tree growth for the control of Dioryctria rubella by cutting pine shoot

为了评价人工剪梢防治微红梢斑螟对松树生长的影响,分别在当年5月份和7月份对微红梢斑螟危害过的马尾松、湿地松幼林实施人工剪梢防治微红梢斑螟幼虫。结果表明:人工剪梢防治微红梢斑螟对松树生长的影响与剪梢时间和树种有关。人工剪梢防治对马尾松、湿地松地径生长均有一定的促进作用,其中5月份剪梢的马尾松地径增长最明显,达14.87%;5月份人工剪梢防治对马尾松、湿地松树高的影响不明显,而7月份剪梢引起马尾松、湿地松树高损失明显,分别为12.99%、7.93%;5月份人工剪梢防治对马尾松梢长的影响也明显低于7月份,而5月份、7月份人工剪梢对湿地松梢长的影响不显著。综合分析表明,与7月份相比,5月份人工剪梢防治微红梢斑螟对松树生长的影响较小,建议采用。

In order to estimate the influence of shoot pruning on the growth of pine to control Dioryctria rubella,the experiments on shoot pruning at young plantations of Pinus massoniana and Pinus elliottii to control D.rubella larva were carried out in May and July.The result showed,the effect of shoot pruning on the growth of pine tree to control the damage of D.rubella was related to the pine species and pruning time.Shoot pruning had a certain promoting effect on the ground diameter growth of pine.Moreover,the increase of ground diameter of P.massoniana was most obvious when the tree shoots were sheared in May,and the relative growth of the ground diameter was increased by 14.87%.However,it had no significant influence to the height growth of P.massoniana and P.elliottii by pruning shoots in May.While,the relative height growth of P.massoniana and P.elliottii were reduced by 12.99% and 7.93% respectively by pruning shoots in July.The influence of shoot pruning in May on the shoot elongation of P.massoniana was significantly lower than that in July.However,this control way had no significant influence to the shoot elongation of P.elliottii.It synthetically showed that,it had less effect on the pine tree growth by shoot pruning in May to control D.rubella,compared with that in July.So shoot pruning in May to control D.rubella in two pine forest is suggested.