تاثير مركب NeemAzal T/S و المستخلص المائي للثمار الناضجة للازدرخت (Melia azedarach L.) في مكافحة حفارات ساق الذرة الصفراء و دورهما في رفع الغلة الحبية لمحصول الذرة الصفراء

The corn stem borers (species Sesamia cretica Led., Sesamia nonagrioides Lef. and Ostrinia nubilalis (Hübner)) have huge damage on stems and ears. Tunnels created cause a significant decrease in quantity and quality of yield (Myers and Wedberg, 1999). This study was initially conducted in eastern region of Syria in the period between 2004 and 2005. In using NeemAzal T / S and aqueous extract for mature fruits of Melia azedarach L., there is a significant reduction in infested rate. Findings show that infested rates in stems were 15%, 26% and ears 9%, 13% using NeemAzal and aqueous extract for mature fruits respectively in contrast with control which was 37%, 18% of stems and ears respectively. This consequence was positively reflected on 1000 grain weight and therefore the increase was 20% and 9% using NeemAzal and aqueous extract for mature fruits respectively in yield.