赤水金钗石斛黑斑病菌生物学特性及防治研究

 对金钗石斛黑斑病菌的生物学特性、培养性状及形态等研究表明,病原菌为细极链格孢菌(Al-ternaria tenuissima).适宜菌丝生长的温度为5~35℃,最适温度为25℃,分生孢子萌发的温度范围为5~35℃,最适温度为25℃.光照对菌丝生长和孢子萌发无明显的影响.药效试验表明:10%苯醚甲环唑67μg/mL,64%恶霜灵1 607μg/mL对菌丝的抑菌率均为100%,90%乙磷铝的抑菌效果不明显.

Studies on biological characteristic of black rot in Dendrobium nobile of Chishui

Biological characteristics of Alternaria tenuissima in Dendrobium nobile were studied.The results showed that the suitable temperature range for mycelid growth is from 5-35℃,and the optimium temperature is 25℃.The temperature is 5-35℃ to germinate of spores,and 25℃ were optimum.Different illumination did not obviously influence to mycelial growth and spores germination.The study also indicated that the fungicides(10% difenoconazole at 67μg/mL,and 64% oxadixyl at 1607μg/mL) creat strong fungistatic action against Alternaria tenuissima in vitro,and the percentage for fungistutic action of inhibiton to the mycelial growth recorded 100%.The fungicides(90% fosetyl-aluminium) is not obvious for fungistatic action.