“For a long time, weed management is mainly in chemical weeding, although the herbicide dosage increases gradually, but the farmland weeds is still very serious, and has continued to aggravate the situation.

The past is a kind of paddy field is now a variety of hazards of barnyard grass, and barnyard grass harm, new farmland weeds and refractory weeds significantly increased. As before, the basic Alopecurus Brome in the northwest, North China is now.” In the second session of the Forum on weed control, plant protection Chinese academy researcher Zhang Zhaoxian said, according to statistics, China has 59 biological weed type 37 were resistant to 10 kinds of 31 herbicides. Such as flixweed of tribenuron methyl and pinoxaden, 2 methyl 4 chlorine, a.japonicus to fenoxaprop-p-ethyl, Clodinafop propargyl, Haloxyfop-r-methyl, Chlorsulfuron and florasulam etc. have a high level of resistance.

Jiangsu Provincial Academy of Agricultural Sciences researcher Li Gui introduced plant paddy field herbicide development trend, excessive reliance on chemical herbicides, resulting in the practical application of randomness, super dose, time, random mixture overrun phenomenon, weed resistance problems have become increasingly prominent.

According to bensulfuron, pyrazosulfuron, butachlor, acetochlor and mefluidide five Cyhalofop herbicide resistance was faster, the barnyard grass, Leptochloa, water resistant amaranth is becoming more and more serious, and the number of occurrence of hazard area increased rapidly.

“We have to weed resistance management into a vicious circle, today we control the weed resistance to this drug, tomorrow for another kind of governance the weed drug resistance, and the day after tomorrow is an agent, so long the year in previous years, there will be what agents are beat to death the weed situation. At present, the world has a grass of the emergence of this problem, it has 11 kinds of different action mechanism of herbicide resistance. In order to cure drug resistance, there will be the problem of the polyclonal antibody. And in the same crop field, selective herbicide we can use is limited, but since the last century since 80s, 20 years have not developed a new mechanism of herbicide.” Zhang Zhaoxian stressed that the serious problem of our warning, chemical herbicides indispensable but not to rely completely on the current, weed management mode should be changed.