Control Leersia hexandra and Other Weeds Applicating Pyraclonil in Mechine Transplanting Rice Fields
To explore chemical control techniques for Leersia hexandra and other weeds,we selected pre-emergent herbicides including pyraclonil and pretilachlor+bensulfuron-methyl·mefenacet to control weeds in machine transplanting rice fields of Jintan District,Changzhou City in 2022.The results showed that plant and fresh weight control effects at filling stage of pyraclonil 2％GR with 650 g/667 m2 on Gramineae weeds and broad-leaved weeds were over 96％and 98％,respectively,and those of on perennial weeds reproduced by rhizomes L.hexandra were all over 96％in machine transplanting rice fields.At filling stage,plant control effects of pretilachlor 500 g/L EC with 80 mL/667 m2+bensulfuron-methyl·mefenacet 53％WP with 60 g/667 m2 on Gramineae weeds and broad-leaved weeds were only 65.05％and 55.79％,respectively.However,fresh weight control effects of the mixtural herbicide on Gramineae weeds and broad-leaved weeds reached to 88.17％and 95.86％,respectively.Plant and fresh weight control effects of the mixtural herbicide on Gramineae weeds were low mainly due to its lack of control effect on L.hexandra.Control effect of pyraclonil as pre-emergent herbicide on L.hexandra and other main weeds was efficient in machine transplanting rice fields.
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