生防菌株2LN3对水稻纹枯病的防效和产量构成的影响

目的]进一步验证生防菌株2LN3对水稻纹枯病的防治效果。方法]通过大田生产试验研究生防菌剂2LN3、生防菌剂2LN3+井冈霉素、井冈·腊芽菌、井冈霉素和清水对照5个处理对水稻纹枯病的防效和产量构成的影响。结果]生防菌剂2LN3+井冈霉素对水稻纹枯病的防治效果较好,2次用药后第7和第15天的防效分别达60.85%和72.16%,2次调查防效均超过生防菌剂2LN3、井冈·腊芽菌和井冈霉素,而单用生防菌剂2LN3则表现为药效持续时间较短,在2次用药后的第15天防效比井冈霉素略高,但与井冈·腊芽菌相比防效则降低了6.5%;与井冈霉素相比,生防菌株2LN3具有促生作用,能显著提高有效穗数、实粒数、结实率和千粒重;喷施生防菌剂2LN3和生防菌剂2LN3+井冈霉素都具有一定的增产作用,与井冈霉素相比分别增产3.8%和12.1%,均达到显著性差异。结论]将生防菌剂2LN3和井冈霉素复配可替代井冈霉素应用于实际生产中来提高对水稻纹枯病的防效。

Effect of Bio-control Bacteria Agent 2LN3 on Control of Rice Sheath Blight and Yield Components

Objective] The aim was to verify control effect of bio-control bacteria agent 2LN3 against rice sheath blight.Method] We studied effect of bio-control bacteria agent 2LN3,bio-control bacteria agent 2LN3+validamycin,validamycin·Bacillus cereus,validamycin and water control on control of rice sheath blight and yield components through field production test.Result] Bio-control bacteria agent 2LN3+validamycin had good control effect on rice sheath blight,and the control efficiency of two times applying after 7 days and 15 days reached 60.85% and 72.16%,respectively,which were more than control efficiency of bio-control bacteria agent 2LN3,validamycin·Bacillus cereus and validamycin,while single bio-control bacteria agent 2LN3 had shorter last time of efficacy,and its control efficiency of two times applying after 15 days was more than that of validamycin,but was decreased by 6.5% comparing with validamycin·Bacillus cereus.Compared with validamycin,the bio-control bacteria agent 2LN3 had growth-promoting effect,and could significantly improve number of productive ear,filled grain number,seed setting rate and 1 000-grain weight.Both bio-control bacteria agent 2LN3 and bio-control bacteria agent 2LN3+validamycin could improve yield of rice,and significantly increase by 3.8% and 12.1% comparing with validamycin.Conclusion] The bio-control bacteria agent 2LN3 mixed with validamycin could be used in actual production to improve control effect on rice sheath blight.