杀菌剂对串珠廉孢亚粘团变种菌丝生长、产孢、孢子萌发及芽管生长的影响

研究了不同杀菌剂对病原菌菌丝生长、产孢、孢子萌发及芽管伸长的抑制作用。结果表明:60%氟吗.锰锌WP、15%三唑酮WP、47%腈菌.锰锌WP 3种杀菌剂对该菌菌丝生长的抑制率均达到100%,菌丝不能生长,3种杀菌剂之间差异不显著。50%多菌灵WP、47%腈菌.锰锌WP两种杀菌剂抑制孢子萌发的EC50值最小;77%氢氧化铜WP抑制孢子萌发的EC50值最大;不同杀菌剂抑制该菌分生孢子芽管伸长的EC50差异显著,47%腈菌.锰锌WP的EC50最小;70%甲基托布津WP EC50最大;杀菌剂对分生孢子的产生有显著的抑制作用,产孢量明显小于对照,60%氟吗.锰锌WP可完全抑制孢子的形成。可将50%多菌灵WP、47%腈菌.锰锌WP、60%氟吗.锰锌WP当作保护剂使用,在玉米顶腐病症状尚未出现或现症初期使用,防止病害发生;亦可在病害已经发生,症状明显时使用,防治病害在田间造成再侵染。

Inhbitory Effects of Fungicides on Fusarium moni-lif orme ver.subglutinans

The inhibitory efficacy of six fungicides,60% mancozeb·Flumorph WP,15% triadimefon WP,47% mancozeb·myclobutanil WP,50% carbendazim WP,77% copper·hydroxide WP,70% thiophanate-methy l WP to spore germination,sporulation and hyphal growth of F.moni-lif orme ver.subglutinans was determined in this study.The resulds showed that 60% mancozeb·flumorph WP,15% triadimefon WP and 47% mancozeb·myclobutanil WP had strony inhibitory effect on F.monil-if orme ver.subglutinans.The inhibition rates of the three fungicides to hyphal growth were all 100%,and hyphy couldn''t grow.So they will be applied to control the occurrence and development of corn top-rotten disease dttrring exponental phase.Also,the EC₅₀ of different fungicdes to spore germination were significent different.The EC₅₀ of 50% carbendazim WP and 47% mancozeb·myclobntanil WP were lower than others,and the virulence were strongest.While that of 77% copper hydroxide WP was highest,and the virulence was lowest.In addition,the EC₅₀ of different fungicides to tube extension of conidium were great different.The EC₅₀ of 47% mancozeb·myclobntanil WP was lowest than others,and the inhibitory efficacy was the best,but the virulence of 70% thiophanate-methyl WP was lowest.Lastly,the inhibitory efficacy of different fungicides to the sporulation had obvious difference.The amount of conidium was great lower than CK.And the 60% mancozeb·flumorph WP could restrain completely the formation of spore.Therefore,50% carbendazim WP,47% mancozeb·myclobutanil WP and 60% mancozeb·flumorph WP will be applied to protect corn before or at the beginniny of the occurrence of top rotten disease.