红松疱锈病防治指标的研究

STUDY ON CONTROL INDEX OF KOREAN PINE BLISTER RUST

在红松人工林疱锈病(Cronartium ribicola)综合防治技术研究基础上,又对不同发病林分累积3年病情损失、各项防治措施的效益和成本进行了分析,确定林分发病率5％为该林分红松疱锈病的经济阀值。因此防治指标是:林分发病率在5％以下时可以不防;林分发病率在5％—9.5％时,采用修枝结合药防措施(修除1.5—1.8 m以下侧枝,松焦油+柴油涂干防治);林分发病率在9.5％以上时,应用间伐+修枝+药防措施(间伐强度20％—30％,然后修技和药剂防治。这样应用该指标管理病害,以3年为一个防治周期,可获显著的防治效果和经济效益。

Based on the researches on integrated control techniques of Korean pine blister rust diseased plantation, the 3 years' loss of various diseased stands, the profits and costs of different control measures were analyzed. The economic threshold value of Korean pine blister rust disease in about 20 years' stands was 5% for incidence. The control indexes of the disease are: When the incidence of diseased stands is under 5%, it need not to take control measure; Then it is from 5% to 8.5%, pruning and chemical measures should be taken by pruning the branches under 1.5m-1. 8m high and smearing cankers with mixture of oil tar and diesel oil; When it is over 9.5% , the control measures such as thinning 20%-30% of trees , pruning branches below 1.5m and curing slightly diseased trees with the fungicides should be carried out. Using above control indexes to manage Korean pine blister rust, significant control effects and economic profits could be got.