The Effect of Corn//Sugarcane on Rhopalosiphum maidis (Fitch), Ceratovacuna lanigera (Zehntne) and Their Main Natural Enemies

• JING Fansheng, 
• CHEN Bin, 
• CHANG Huaiyan, 
• ZHAO Yuanpeng, 
• LI Zhengyue, 
• ZHANG Limin