五爪金龙和圆叶牵牛对某些除莠剂的反应

Response to Some Herbicides of Pharbitis purpurea and Ipomoea cairica

五爪金龙Ipomoeacairica和圆叶牵牛Pharbitispurpurea是华南地区重要的草质藤本杂草。 6 5× 10 - 6以上浓度的 2甲 4氯和 36 0× 10 - 6以上的 2 ,4 -D丁酯完全能使圆叶牵牛种子不能萌发 ,幼苗致死。叶片喷洒 6 50× 10 - 6以上浓度的 2甲 4氯及 36 0 0× 10 - 6以上浓度的 2 ,4 -D丁酯能杀灭五爪金龙和圆叶牵牛成熟植株。分别在茎干基部注射 1ml的 2 ,4 -D丁酯、“恶草灵”和“毒莠定”能较彻底地灭除五爪金龙。

Pharbitis purpurea and Ipomoea cairica are worst weeds of herbaceous vine in South China. Seeds of P.purpurea were treated by germinating application of 2 methyl 4 chlorine and 2,4 D, the results showed that at concentrations of 65×10 -6 and 650×10 -6 2 methyl 4 chlorine reduced germination to 64% and 97 7% respectively, at concentrations of 36×10 -6 and 360×10 -6 2,4 D reduced germination to 62 6% and 84 7% respectively. Seedlings of P.purpurea were treated by foliage application of 2 methyl 4 chlorine and 2,4 D, the results showed that at 650×10 -6 2 methyl 4 chlorine and 360×10 -6 2,4 D would kill the seedlings as soon as. Plants of P.purpurea and I.cairica were treated by foliage application of 2 methyl 4 chlorine and 2,4 D, the results showed that 650×10 -6 2 methyl 4 chlorine and 3 600×10 -6 2,4 D would kill the plants at day 5. One ml of 2,4 D,“RONSTAR” and “TORDON” was injected respectively into stem of I.cairica, the plant was killed entirely in day 2.