Effect of Weed Management in Mulberry on Silkworm Rearing and Cocoon Production

摘要

The effect of weed management practices in mulberry and its impact on silkworm growth and cocoon characters were assessed during 2011-12. The pooled data of two crops revealed that the mature larval weight was found to be significantly highest in Isoproturon 70 WP 1.25 kg a.i. / ha (31.97 g / 10 larvae) followed by Isoproturon 70 WP 1.00 kg a.i. / ha (31.70 g /10 larvae), The cocoon weight was also found to be maximum in Isoproturon 70 WP 1.25 kg a.i. / ha (2.10 g), followed by Glyphosate (41 SL 8 ml/ litre) (1.93 g). The unweeded control recorded lowest shell weight (0.18 g), whereas the highest in Isoproturon 70 WP 1.25 kg a.i. / ha (0.33 g) which was on par with Glyphosate 41 SL 8 ml / litre (0.33 g). The shell percentage was found to be maximumin Isoproturon 70 WP 1.25 kg a.i. / ha (18.67), as compared to all other herbicide treatments. The Isoproturon 70 WP 1.25 kg a.i. / ha recorded significantly highest filament length (849.44 m) per cocoon than all other herbicide treatment. The filamentweight was significantly higher in Isoproturon 70 WP 1.25 kg (0.35 g) followed by Isoproturon 70 WP 1.00 kg (0.34 g). The Isoproturon 70 WP 1.00 kg recorded significantly highest raw silk percentage (18.04) than all other herbicide treatment. Lowest renditta of 5.58 and 6.0 was recorded in Isoproturon 70 WP 1.00 kg and 1.25 kg, respectively.