庶无草芽后除草效果及其对不同甘蔗品种的影响

通过实地调查，粤西旱地蔗区蔗田杂草发生普遍，一年中超过20科56种杂草相继发生，其中禾本科、菊科、莎草科、苋科杂苹占总数的50％以上．以马唐、光头稗、牛筋草、狗牙根、白茅、龙爪茅、香附子、胜红蓟等危害为主。利用庶无草进行芽后除草试验，结果表明，庶无草芽后除草效果明显，持效期长，能有效控制蔗田杂草发生。对大部分一年生单子叶、双子叶杂草特效；对部分多年生恶性杂草如香附子、狗牙根等有较好防效；药后15d综合防效95．17％，药效好。除ROC16、ROC22外，其余参试品种对药剂均有轻微的不良反应，但均不明显。药后60d目测恢复情况，除粤糖93-159、粤糖00—236显得稍矮外，其余品种长势正常。

Preliminary Study on Weed Control Efficacy after Budding of Zhuwucao and Its Effect for Different Sugarcane Varieties

The occurrence of weeds in the upland sugarcane field in the west of Guangdong province was studied on the base of investigation and the analysis in this paper.It showed that more than 56 species 20 families of weeds successively occurred in one year,and the weeds of Gramineae,Compositae,Cyperus and Amaranthaceae,such as crabgrass,barnyardgrass,goosegrass,bermuda grass,cogon-grass,Dactyloctenium aegyptium,Rice galingale,Ageratum conyzoides etc were accounted for over 50% in total.The experiment of sugarcane field weed control with Zhuwucao after budding showed that weeding effect was obvious,the efficacy duration was long It had the best efficaoy for the most annual monocotyledon and dicotyledon and better efficacy for some perennial noxious weeds such as Rice galingale,bermuda grass and so on.The integrated control effect reached 95.17% after 15 days application.All the tested sugarcane varieties(not including ROC16 and ROC22)were a little sensitive to the herbicide,and returned to normal sixty days after treatment except for YT93-159 and YT00-236 with a little shorter plant height than the controls.