哈茨木霉菌LTR-2对烟草黑胫病的田间防治效果

Field Control Effect on Tobacco Black Shank by Trichoderma harzianum LTR-2

为验证哈茨木霉菌LTR-2对烟草黑胫病的防效,在有病史的烟田开展田间药效比较试验.结果表明:栽后20~60 d,2亿孢子/克哈茨木霉菌WP、72%甲霜·锰锌WP、10亿/g枯草芽孢杆菌DP对烟草黑胫病的相对防效分别从80.41%降至54.77%、90.21%降至61.62%、80.93%降至42.70%;3个药剂处理的烟叶产量、均价、产值差异无统计学意义,两个生物药剂的中上等烟比例显著提高.说明哈茨木霉菌LTR-2对烟草黑胫病防效较好,能提高中上等烟比例,是一种较好的烟草黑胫病生物防治药剂.

To verify the field control effect of Trichoderma harzianum LTR-2 on tobacco black shank,the control effect comparison in field trial was conducted with the amount of 2.25 kg/hm2 applied 3 times every 10 days in tobacco fields with a history of tobacco black shank.The test results showed that 20 to 60 days after planting,the relative control effects of 200 million spores per gram Trichoderma harzianum wettable powder,72%Metalaxyl mancozeb wettable powder,and 1 billion spores per gram Bacillus subtilis powder on tobacco black shank decreased respectively from 80.41%to 54.77%,90.21%to 61.62%,and 80.93%to 42.70%.There were no statistically significant differences in tobacco yield,average price,and output value among the treatments,but the proportion of middle and upper-grade tobacco leaves treated with two biopharmaceuticals increased significantly.It proved that the Trichoderma harzianum LTR-2 acquires better control effect on tobacco black shank,increases the proportion of middle and upper-grade tobacco leaves,and will be an ideal biological control agent for tobacco black shank.