Roberts Daniel P, Lakshman Dilip K, McKenna Laurie F, Emche Sarah E, Maul Jude E, Bauchan Gary
Sustainable Agricultural Systems Laboratory.
Sustainable Agricultural Systems Laboratory and Florist and Nursery Plants Research Unit.
Plant Dis. 2016 Jul;100(7):1278-1287. doi: 10.1094/PDIS-09-15-1039-RE. Epub 2016 Mar 7.
Environmentally friendly control measures for soilborne plant pathogens are needed that are effective in different soils when applied alone or as components of an integrated disease control strategy. An ethanol extract of Serratia marcescens N4-5, when applied as a cucumber seed treatment, effectively suppressed damping-off caused by Pythium ultimum in potting mix and in a sandy loam soil. Plant stand associated with this treatment was similar to that of seed treated with the chemical pesticide Thiram in the sandy loam soil. The N4-5 ethanol extract did not consistently provide significant disease control in a loam soil. The N4-5 ethanol extract was compatible with two Trichoderma isolates, not affecting in vitro or in situ colonization of cucumber by these biological control fungi. Control of damping-off of cucumber was never diminished when this ethanol extract was applied as a seed treatment in combination with in-furrow application of the Trichoderma isolates, and disease control was improved in certain instances with these combinations in the loam soil. Data presented here indicate that the N4-5 ethanol extract is compatible with certain beneficial fungi, suggesting that this extract can be used as a component of integrated disease control strategies featuring biological control fungi.
需要有对土壤传播的植物病原体的环保控制措施，这些措施单独使用或作为综合病害控制策略的组成部分时，在不同土壤中均有效。粘质沙雷氏菌N4-5的乙醇提取物作为黄瓜种子处理剂使用时，能有效抑制盆栽混合料和沙壤土中由终极腐霉引起的猝倒病。在沙壤土中，与该处理相关的植株生长状况与用化学农药福美双处理的种子相似。N4-5乙醇提取物在壤土中并不能始终如一地提供显著的病害控制效果。N4-5乙醇提取物与两种木霉菌株相容，不影响这些生物防治真菌在体外或原位对黄瓜的定殖。当该乙醇提取物作为种子处理剂与木霉菌株沟施相结合时，黄瓜猝倒病的防治效果从未降低，并且在某些情况下，这些组合在壤土中提高了病害防治效果。此处提供的数据表明，N4-5乙醇提取物与某些有益真菌相容，这表明该提取物可作为以生物防治真菌为特色的综合病害控制策略的一个组成部分。
