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Measures to Improve the Control Efficacy of Mesosulfuron-methyl and Isoproturon

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Mesosulfuron-methyl and isoproturon are ideal herbicides for controlling weeds in wheat fields, but some farmers report poor weed control with mesosulfuron-methyl and isoproturon. The main reasons are as follows: First, isoproturon can only control grass weeds in wheat fields such as shortawn foxtail (Alopecurus aequalis) and hard grass, but is ineffective against broadleaf weeds such as large vetch (Vicia gigantea) and cleavers (Galium aparine). If isoproturon is used alone, the residual density of broadleaf weeds in the wheat field will inevitably be very high, appearing as poor weed control, whereas the control efficacy of mesosulfuron-methyl on wheat field weeds is markedly different. Second, the application timing is inappropriate; mesosulfuron-methyl

Mesosulfuron-methyl and isoproturon are ideal herbicides for controlling weeds in wheat fields, but some farmers report poor weed control with mesosulfuron-methyl and isoproturon. The main reasons are as follows:

First, isoproturon can only control grass weeds in wheat fields such as shortawn foxtail (Alopecurus aequalis) and hard grass, but is ineffective against broadleaf weeds such as large vetch (Vicia gigantea) and cleavers (Galium aparine). If isoproturon is used alone, the residual density of broadleaf weeds in the wheat field will inevitably be very high, appearing as poor weed control, whereas the control efficacy of mesosulfuron-methyl on wheat field weeds is markedly different.

Second, the application timing is inappropriate. The optimal short window for mesosulfuron-methyl and isoproturon to control weeds in wheat fields is the one-leaf to two-leaf stage of grass weeds; application too early or too late will significantly reduce weed control efficacy.

Third, the weed control efficacy of mesosulfuron-methyl and isoproturon is closely related to soil moisture. If the soil is moist or has high humidity after application, the efficacy is fully exerted and isoproturon shows remarkable weed control; if it is dry after application, the weed control efficacy of isoproturon will drop substantially and the control effect will be poor.

Fourth, the influence of application quality and seedbed preparation quality on efficacy. The spray water volume for mesosulfuron-methyl and isoproturon must be sufficient, and application must be uniform and thorough to ensure weed control efficacy. At the same time, seedbed preparation quality is also quite important. If tillage is rough, with large clods, the spray cannot contact these areas; it is conceivable that there will certainly be more weeds in the field, and the weed control efficacy will be poor.

Fifth, field weed density is too high. It should be said that the weed control efficacy of isoproturon is clearly superior to that of chlorotoluron, but when wheat field weed density is too high, even if the weed control efficacy reaches 90%, with 1000 weeds per sq m, there will still be 100 weeds in the wheat field after application, thus appearing as incomplete weed control with isoproturon.

Sixth, isoproturon has no obvious weed control efficacy on wheat field weeds dominated by Kentucky bluegrass (Poa annua), because Kentucky bluegrass has strong herbicide tolerance, and most soil-applied herbicides are ineffective against it; instead, after rotation with broad bean, chemical control is carried out by tea treatment or treatment with a non-selective herbicide.

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