Hot Potatoes是一种易学好用的语言教学辅助工具。文章中介绍了其常用的功能及在设计大学英语多媒体作业方面的应用优势,并用图示以听力理解题型和匹配型练习题为实例,详细介绍使用Hot Potatoes设计出符合英语教师教学实际需要的多媒体...Hot Potatoes是一种易学好用的语言教学辅助工具。文章中介绍了其常用的功能及在设计大学英语多媒体作业方面的应用优势,并用图示以听力理解题型和匹配型练习题为实例,详细介绍使用Hot Potatoes设计出符合英语教师教学实际需要的多媒体作业的操作步骤。展开更多
The entomopathogenic nematode,Steinernema carpocapsae,was evaluated for control of the potato tuber moth,Phthorimaea operculella,under laboratory conditions.We evaluated different concentrations of S.carpocapsae for c...The entomopathogenic nematode,Steinernema carpocapsae,was evaluated for control of the potato tuber moth,Phthorimaea operculella,under laboratory conditions.We evaluated different concentrations of S.carpocapsae for control of 2 nd,3 rd,and 4 th instar P.operculella.The median lethal concentration(LC50)of S.carpocapsae infective juveniles(IJs)to 2 nd,3 rd and 4 th instar larvae of P.operculella was 200,363,181 IJs mL–1,respectively.With the extension of treatment time,the cumulative mortality increased for 2 nd,3 rd,and 4 th instar larvae and pupae of P.operculella.Fourth instars were the most susceptible for all observation periods.Therefore,our results suggest that S.carpocapsae could be an effective biological control agent for P.operculella.展开更多
基金supported in part by the National Key Research and Development Program of China (2018YFD0200802)
文摘The entomopathogenic nematode,Steinernema carpocapsae,was evaluated for control of the potato tuber moth,Phthorimaea operculella,under laboratory conditions.We evaluated different concentrations of S.carpocapsae for control of 2 nd,3 rd,and 4 th instar P.operculella.The median lethal concentration(LC50)of S.carpocapsae infective juveniles(IJs)to 2 nd,3 rd and 4 th instar larvae of P.operculella was 200,363,181 IJs mL–1,respectively.With the extension of treatment time,the cumulative mortality increased for 2 nd,3 rd,and 4 th instar larvae and pupae of P.operculella.Fourth instars were the most susceptible for all observation periods.Therefore,our results suggest that S.carpocapsae could be an effective biological control agent for P.operculella.
