Effect of planting methods and chemical control of stem borer Sesamia cretica Led. on some growth characters of two cultivars of Sorghum bicolor L.

Abstract

This study which was done using soil of loamy sand texture at Al-Husy location/Amiriya of Al-Anbar govern mate during fall of 2004, aimed to understand the cultivation methods effects (lines and furrows), two kinds of pesticides (cruiser and match) on the some development characters of two cultivars of sorghum (Inqath, Jiza-15). Results can be summarized as follows: Jiza-15 cultivar took less time to reach the 50% inflorescence and the physiological maturity stages, it got the highest mean for development characters of plant heights growth and dry matter yield, while Inqath cultivar recorded a highest mean of leaf area and gave a lowest percentage of infestation. Plants cultivated with furrows gave a highest significant mean of leaf area and dry matter yield, that method also recorded a lowest percentage of infestation. It also no effected significant of plant height, day number from sowing up to 50% flowering and day number from sowing up to physiological maturity stage. Treatment of control plant with in pesticide cruiser showed a lowest percentage of infestation and high significant in leaf area and dry matter yield as compared to match pesticide and control treatment. The interaction between varieties and cultivation methods, varieties and pesticides had a significant effects on some development characters (leaf area and dry matter yield), as Jiza-15 cultivar planted on furrows recorded a highest mean of dry matter yield (17.82 ton/ha), while Inqath cultivar treated with cruiser pesticide recorded a highest mean of leaf area (5118.67cm2). The interaction between varieties, planting methods and pesticides showed a highest mean of leaf area and dry matter yield, as Inqath cultivar treated with cruiser pesticide and planted on furrows recorded a highest mean of leaf area (5230.33 cm2).