Investigation of Fungicides Inhibitory Effect of on Summer Patch Disease, Caused by Magnaporthiopsis poae, in Kentucky bluegrass

J. H. Lee, G. Shim, Jeong-Ho Kim, Chang-Wook Jeon, Youn-Sig Kwak
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Abstract

. Summer patch is the most serious disease at turfgrass field or golf course established with Kentucky bluegrass during high temperature season in Korea. Nevertheless, chemicals for the summer patch control are not yet registered in Korea. We isolated the pathogens from the turfgrass showing typical summer patch symptoms and identified as Magnaporthiopsis poae by using the internal transcribed spacer ITS1 and ITS4 sequences of rDNA. The inhibition rates of the pathogen were investigated for 10 fungicides. As results, the pathogen growth was suppressed when chemicals concentration increased and negatively correlated with incubation period with the chemicals. In triazole group, all chemicals (metconazole, myclobutanil, propiconazole and tebuconazole) treated showed the inhibition rates by 100%. Thiophanate-methyl showed the next highest inhibition effect against a summer patch pathogen. In strobilurin group, pyraclostrobin was the highest suppression effect compared with azoxystrobin and trifloxystrobin. Inhibition effect of fludioxonil and fluxapyroxad on pathogen was similar to the trifloxystrobin. Based on the results, triazole and carboxamide groups are strongly recommended due to the highest inhibition effect on the summer patch pathogen, Magnaporthiopsis poae.
杀菌剂对肯塔基蓝草夏季斑病的抑制效果研究
. 夏季斑病是在国内高温季节用肯塔基蓝草种植的草坪或高尔夫球场最严重的病害。但是,在国内还没有登记夏季防治药剂。从具有典型夏斑症状的草坪草中分离到病原菌,利用rDNA内部转录间隔序列ITS1和ITS4序列鉴定为poae Magnaporthiopsis。研究了10种杀菌剂对病原菌的抑制率。结果表明,随着药剂浓度的增加,病原菌的生长受到抑制,并与药剂的潜伏期呈负相关。三唑组化学药剂(甲康唑、丁腈、丙环康唑和戊康唑)的抑菌率均为100%。噻吩酸甲酯对夏季斑病菌的抑制作用次之。在strobilurin组中,pyraclostrobin的抑制效果高于azoxystrobin和trifloxystrobin。氟嘧菌腈和氟嘧菌沙对病原菌的抑制作用与三氯虫酯相似。结果表明,三唑和羧酰胺对夏斑病原菌poae的抑制效果最好。
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