几种松树受松突圆蚧危害程度的调查研究

通过对几种松树受松突圆蚧危害程度和松树枯死木的调查研究,5 a中黑松、马尾松、湿地松的中重度危害程度所占的平均比例依次为76.9%、57.8%和13.3%;3 a中黑松、马尾松、湿地松受害松树枯死率平均比例依次为9.8%、1.3%和0.069%,其结果表明,受害程度为黑松重于马尾松,马尾松重于湿地松,并建议在松突圆蚧疫区营造松类,应尽量选择湿地松树种。

The survey of the damage on pines by Hemibrlesia pitysophica

Based on the data of the damage on pines by Hemibrlesia pitysophica, the result showed that during 5-year survey the average middle and heavy damage of Pinus thunbergii,Pinus massomniana and Pinus ellottii accounted for 76.9%,57.8% and 13.3% respectively;during 3-year survey the average dead trees of P.thunbergii,P.massomniana and P.ellottii accounted for 9.8%,1.3% and 0.069% respectively.More damage happened to P.thunbergii than to P.massomniana,then to P.ellottii,so P.ellottii was suggested to plant in the area where H.pitysophica was epidemic.