| 摘要: |
| 为明确苹婆 Sterculia monosperma 炭疽病的病原菌暹罗炭疽菌 Colletotrichum siamense 的生物
学特性，筛选有效的杀菌剂，用生长速率法测定了苹婆炭疽病病原菌最适生长温度、pH 值、碳源、氮源
等生物学特性，并测定了 6 种杀菌剂对其的室内毒力。研究结果表明，暹罗炭疽菌最适碳源为纤维素粉
和乳糖，最适氮源为胰蛋白胨，最适 pH 值为 7.0，最佳生长温度范围为 28~30 ℃，致死温度为 55 ℃，不
同光照条件下对其生长影响差异不显著。室内毒力测定结果表明 98% 溴菌腈、97% 嘧霉胺、95% 啶酰菌
胺、98% 嘧菌酯、96.8% 苯醚甲环唑和 98% 福美双对病原菌菌丝生长均有抑制效果，其中 96.8% 苯醚甲
环唑的抑制效果最佳，EC50 值为 5.24 μg/mL。 |
| 关键词: 苹婆 暹罗炭疽菌 生物学特性 毒力测定 |
| DOI： |
| 分类号: |
| 基金项目:广东省林业科技创新项目(2020KJCX004；2023KJCX022) |
|
| Studies on Biological Characteristics and Lab Toxicity Test of Leaf Pathogen (Colletotrichum siamense) on Sterculia monosperma |
|
wangcheng1, zhaoyi2, gaochenglong2, zhangxinjie2, zhaodanyang2, hulili2, chenshiqi3, huanghuayi2
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1.Longyandong Forest Farm of Guangdong Province;2.Guangdong Academy of Forestry;3.South China Agricultural University
|
| Abstract: |
| To identify the biological characteristics of Colletotrichum siamense, a leaf pathogen of Sterculia
monosperma, and to screen eff ective fungicides, the biological characteristics of C. siamense, such as the light
exposure, pH, carbon source, nitrogen source and temperature, were determined by the method of growth rate.
The 6 fungicides displayed signifi cant but varying inhibitory eff ects on mycelial development. The results showed
that cellulose and lactose was the most suitable carbon source, tryptone was the preferred nitrogen source. And C.
siamense grew well on PDA medium at the pH of 7.0 and 28-30 °C, the lethal temperature was 55 °C. Diff erent
light exposures did not signifi cantly aff ect the fungal growth. The results of the indoor toxicity test showed that
98% bromothalonil, 97% pyrimethanil, 95% boscalid, 98% azoxystrobin, 96.8% difenoconazole and 98% thiram
had inhibitory eff ects on the mycelial growth of pathogens. For those fungicides, 96.8% difenoconazole showed
high toxicity with EC50 of 5.24 μg/mL. |
| Key words: Sterculia monosperma Colletotrichum siamense biological characteristics toxicity tests |
