Abstract: In order to underatand controlling effect and safety of 960 g/L metolachlor EC against weeds in tomato fields. Tomato variety of Chuanke No.8 was used as experimental materials,control effect and safety of 960 g/L metolachlor EC against annual grass weeds and some broadleaf weeds in tomato fields was studied by field plot test. The results showed that the control effect against Digitaria sanguinalis （L.） Scop., Echinochloa colonum （L.） Link., Ludwigia hyssopifolia （G.Don）Exell, Amaranthus lividus L., Cyperus difformis L. was excellent by soil spray treatment, 1~2 days before tomato transplanting. The recommended dose （formulation amount） was 750.0~862.5 mL/hm²[720~828 （a.i.）g/hm²]. Control effect of 960 g/L metolachlor EC against common annual grass weeds and some broadleaf weeds in tomato fields was excellent. However, due to the rain on the day after spraying, the tomato plant heights in the treatment areas were inhibited to some extent, and the plants were dwarfed, resulting in different degrees of yield reduction.

Key words: metolachlor, tomato, weed, control effect, safety