Influence of unrefined corn oil and surface-active agents on the germination and infectivity of Alternaria helianthi
Influence of unrefined corn oil and surface-active agents on the germination and infectivity of Alternaria helianthi
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DOI：
10.1080/09583159631163
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发表时间：
1996-12-01
影响因子：
1.4
通讯作者：
Egley, GH
中科院分区：
文献类型：
--
作者：
Abbas, HK;Egley, GH
水稻链格孢菌对苍耳的杀菌活性通常需要接种后立即露水。玉米油乳剂和表面活性物质吐温20、40、60、80在悬浮液中均能保持14日龄分生孢子的萌发能力，无论露水是即刻还是延迟24 h，均能使病原菌侵染杂草。玉米油乳剂和西尔维特均能促进苍耳风在苍耳叶片上的萌发，但延迟露水时，西尔维特不能提高其侵染性。未精炼的玉米油通过在无露期保护分生孢子和在出现露水时刺激萌发来提高杀菌剂的药效，玉米油乳剂、Silwt和Tween20、40、60和80缩短了疾病活动所需的露期。粗制玉米油乳剂在无露期内保持了分生孢子油对杂草的发芽能力和致病力，因此有可能作为该杀菌剂在田间应用的配方。
A dew immediately after inoculation is normally required for the mycoherbicidal activity of Alternaria helianthi on common cocklebur. The formulation of A. helianthi conidia in an emulsion of unrefined corn oil enabled the pathogen to infect the weed, regardless of whether dew was immediate or delayed for 24 h. Corn oil emulsion and the surface-active agents Tween 20, 40, 60 and 80 maintained the germination ability of 14-day-old conidia to some degree for up to 4 days in suspension. Both the corn oil emulsion and Silwet stimulated the germination of A. helianthi on common cocklebur leaves, but Silwet did not enhance infectivity when dew was delayed. Unrefined corn oil enhanced mycoherbicide efficacy by protecting the conidia during a dew-free period and by stimulating germination when a dew occurred, Corn oil emulsion, Silwet and Tween 20, 40, 60 and 80 reduced the dew period required for disease activity. Unrefined corn oil emulsion has potential as a formulation for the application of this mycoherbicide in the field because it maintained the germination ability and virulence of conidia oil the weed during a dew-free period.