摘要
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％。
The evaluation results of yield loss caused by Oidium heveae showed that after rubber trees were infected by Oidium heveae, obvious yield loss would be resulted. The more severe disease is, the more yield loss caused. In clone RRIM600, 4.469%, 11.301%, 15.27%, 34.87% of yield loss were caused by disease rating of 1, 2, 3, 4, 5 respectively, and in clone PR107, they were 0, 3.4%, 6.98%, 7.27%, 12.45%.The yield among clones was quite different. The highest yield loss in the clone RRIM600 was 34.87 percent, but in the clone PR107, it was only 12.45 percent.Based on the interaction between yield loss by Oidium heveae and control cost, control benefit, it was determined that the economic threshold was disease index 21.23, and the diseased trees percent of rating 4—5 was 2%.
出处
《热带作物学报》
CSCD
1989年第2期73-80,共8页
Chinese Journal of Tropical Crops
