百香果炭疽病菌生物学特性及室内药剂筛选

为明确百香果炭疽病菌（Colletotrichum karstii）的生物学特性,并筛选出防治效果较好的杀菌剂,采用生长速率法探究该病菌的生物学特性及9种杀菌剂对该病菌的室内毒力。结果表明：该病菌适宜在萨氏（SDAY）培养基上生长,适宜pH为6~9,适宜生长温度为20~30 ℃,最适温度为25 ℃,可高效利用蔗糖与甘氨酸;室内毒力测定发现9种杀菌剂对该病菌菌丝生长均有一定的抑制作用,其中75%肟菌·戊唑醇WG的抑制效果最好,EC₅₀为0.0667 mg/L,其次为18.7%丙环·嘧菌酯SE、42.4%唑醚·氟酰胺SC、25%吡唑醚菌酯SC、50%咪鲜胺锰盐WP,EC₅₀值分别为0.3335、0.4567、0.4630、0.8187 mg/L。

Biological Characteristics of the Pathogen and Fungicides Screening in Laboratory for Anthracnose of Passiflora edulia Sims

The experiment was conducted in order to clarify the biological characteristics of Colletotrichum karstii and screen fungicides with better prevention and control. The mycelial growth rate method was applied to explore the biological characteristics of the pathogen and the laboratory toxicity of 9 fungicides to the pathogen. Results indicated that the pathogen was suitable for growth on the SDAY medium with the optimum pH of 6 to 9 and the suitable growth temperature of 20 to 30 ℃, preferably 25 ℃. Besides, it could efficiently utilize sucrose and glycine. Laboratory toxicity test revealed that 9 fungicides had a certain inhibitory effect on the growth of the mycelium of the pathogen. Among them, 75% trifloxystrobin·tebuconazole WG was the most effective with an EC₅₀ of 0.0667 mg/L, followed by procyclidine·azoxystrobin 18.7% SE, fluxapyroxad·pyraclostrobin 42.4% SC, pyraclostrobin 25% SC, prochloraz-manganese chloride complex 50% WP with an EC₅₀ of 0.3335, 0.4567, 0.4630, 0.8187 mg/L, respectively.