<正>通过对闽侯县、长乐市等地湿地松、火炬松幼林的观察与调查分析表明，松枯梢病使湿地松当年新梢长和梢基部径生长分别降低５６．７３％和３５．８２％。感病新梢的长与径生长随着病害发展而减缓，至６月发病高峰后，其生长与健梢生长的差异明显加剧；病害严重程度与幼树的树高、胸径生长呈负相关。通过对南屿林场２５块１３～１７年生湿地松样地的该病危害损失测定，建立了松枯梢病所致的湿地松树高、胸径和材积生长损失的估测模型，为该病的损失评估和防治决策提供依据。

The results,observed and investigated in Pinus elliottii and P.taeda young stands of Minhou county, Liancheng county and Changle city, showed the pine shoot dieback disease lowered respectively 56.73% and 35.82% of the length and diameter growth of P.elliottii new shoots. The diseased shoot length and diameter growth were slowed up with the disease developing. The growth difference between the diseased and normal shoots became even more obvious after the disease peak of June.The disease incidence was negatively correlated with height and dbh of young trees.According to the damage from the diseaes measured through 25plots in 13～17 years old stands of P.elliottii in Nanyu forest farm．　The loss estimate models of height(y^),　dbh (y^),and volume (y^)have been established.The three models provide a scientitic basis for loss assessment and control decision of the disease.