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橡胶白粉病为害损失测定结果表明:橡胶树受白粉病侵染后会造成明显的产量损失,病越重,损失越大。病害为1级的RRIM600产量无损失,2级的损失4.47％,3级的损失11.3％,4级的损失15.27％,5级的损失34.87％;PR107病害2—5级的损失分别为3.4％、6.98％、7.27％、12.45％。品系间产量损失的差异很大。RRIM600最高损失为34.87％,而PR107最高损失只有12.45％,PR107可能对橡胶白粉病具有一定的耐病性。根据橡胶白粉病为害损失、防治成本、防治效益与病害严重度之间的相互关系,确定橡胶实生树白粉病的经济阈值为最终病情指数21.4,4～5级病株率2％;RRIM600为最终病情指数21.3,4～5级病株率2％;PR107为最终病情指数23.8,4～5级病株率2％。
Rubber powdery mildew damage loss determination results show that: rubber tree powdery mildew will cause significant yield loss, the more serious the disease, the greater the loss. There was no loss of yield of RRIM600 with disease grade 1, the loss of grade 2 was 4.47%, the loss of grade 3 was 11.3%, the loss of grade 4 was 15.27%, and the loss of grade 5 was 34.87%; the loss of grade 2-5 of PR107 was 3.4% , 6.98%, 7.27%, 12.45%. Yield differences between strains vary widely. RRIM600 maximum loss of 34.87%, while the highest PR107 loss of only 12.45%, PR107 may have some resistance to powdery mildew disease. According to the correlation between the loss of rubber powdery mildew, the cost of prevention and treatment and the relationship between the prevention and control benefit and the severity of the disease, the economic threshold for determining the powdery mildew of rubber tree is 21% of the final disease index and 2% Disease index 21.3,4 ~ 5 strain rate of 2%; PR107 for the final disease index 23.8,4 ~ 5 strain rate of 2%.