1. The spores of Bacillus popilliae which are specialized pathogens of the scarabaeid beetles are difficult to be reproduced in vitro.
   日本金龟子芽孢杆菌是一种在活有机体外很难产生孢子的昆虫病原体。

声明：以上例句、词性分类均由互联网资源自动生成，未经过人工审核，其表达内容亦不代表本软件的观点；若发现问题，欢迎向我们指正。