Abstract:

By studying the control effect of herbicides on different weed community structures in wheat fields, and exploring the susceptibility of weeds against the herbicides, we aim to provide support for chemical control of weeds in wheat field. By field trials, we determined the control effect of herbicides against broadleaf weeds, gramineous weeds and both broadlear-gramineous weeds in wheat fields. The results showed that: florasulam was the best herbicides against broadleaf weeds, while mesosulfuron-methyl, pyroxsulam and flucarbazone had good control effect against gramineous weeds and some broadleaf weeds; broadleaf weeds, such as Descuminia sophia and Capsella bursa-pastoris were still susceptible to most tested herbicides, the susceptibility to florasulam was the highest, and florasulam had excellent control effect against Galium aparine L.; most gramineous weeds were susceptible to mesosulfuron-methyl, pyroxsulam and flucarbazone, but only mesosulfuron-methyl was effective against Aegilops tauschii Coss. The preferred herbicide to control broadleaf weeds is florasulam, while the best choice for gramineous weeds and broadlear-gramineous weeds is mesosulfuron-methyl.

Key words: wheat field, weed community, herbicides, control effect, susceptibility