利用MAXENT预测玉米霜霉病在中国的适生区

玉米霜霉病是我国重要的对外植物检疫对象，本文用MAXENT软件对引起玉米霜霉病的5种检疫性病原菌Peronosclerospora maydis、P. sacchari、P. philippinensis、P. sorghi和Sclerophthora rayssiae var. zeae在我国的潜在分布进行了预测。结果表明，5种病原菌中P. sorghi在我国的适生范围最广，根据适生值的大小，其在华北平原、长江中下游平原、东北中部地区、两广、福建及云南西部，均有不同程度的发生风险。在这些地区内种植有大面积的玉米，为玉米霜霉病菌的定殖提供了良好的寄主。加强这些区域的调查监测和检疫对保护当地的玉米生产有重要意义。

Prediction of potential geographic distribution areas of the maize downy mildew in China by using MAXENT

The maize downy mildew caused by Peronosclerospora maydis, P. sacchari, P. philippinensis, P. sorghi or Sclerophthora rayssiae var. zeae was important quarantine disease in maize. The potential risks of these pathogens in China were analyzed by using the software MAXENT. The results indicated that P. sorghi had the largest suitable areas among the 5 kinds of pathogens in China. Areas of moderate and high risk covered the North China Plain, middle and lower plain of Yangtze River, central northeastern regions of China, Guangxi Province and Guangdong Province, Fujian Province as well as western Yunnan Province. There are large areas of maize planted in these regions, which could provide available host for maize downy mildew colonization. It is therefore necessary to quarantine and monitor maize downy mildews for maize production in China.