樟子松幼龄林枯死的防治措施研究

A Study on the Control Measures of the Withering of Young Pinus sylverstris var.mongolica

通过室内药效测定和室外防治试验、营林措施调查及综合防治试验,提出了榆林风沙区樟子松幼龄林病害的防治措施。感病较轻者用50%代森锰锌可湿性粉剂(WP)400倍液或70%甲基托布津复合可湿性粉剂(WP)400倍液防治2次;感病较重者在进行卫生伐的基础上,再用化学农药防治2次。造林时,宜营造混交林,密度应在2 m×3 m以上,造林地不宜选在丘间地和副梁。

Chemical control measures on the diseased young forest of Pinus sylvertris var. mangolica in Yulin sandy area were established by the insecticide efficacy determination, field experiments , investigation of forest management, and experiment of integrated control measures. The lightly diseased forest could be controlled by Mancozeb （50%WP, diluted, 400times） or Thiophanatemethyl （70% WP, diluted, 400times） twice, the severely diseased forests could be controlled twice by the chemical insecticide on the basis of cleaning up the deadwood in the forest land. Mixed forest should be planted , the density should be above 2 m × 3 m to afforest . Afforestion of P. sylverstris var. mongolica was unsuitable on lower and subsidiary dunes.