Pre-emergence is the best way to control weeds in winter cereals. However, because growers focus on planting when the weather permits, it is not always feasible.
However, the rains this week stopped most people from planting, and those who have planted can move the sprayer elsewhere if the ground conditions are suitable. Spraying autumn herbicides on damp ground can also help improve efficacy.
If it is impossible to use the pre-emergence situation, the early application after emergence should be used as much as possible.
Early application should provide better control of problematic weeds, such as annual meadow grass or sterile bromine. However, it is important to avoid applying the plant as it passes through the soil, and to apply a pre-emergence spray if possible.
Pendimethalin can control annual meadow grasses and broadleaf weeds, and all mixtures usually contain DFF to control broadleaf weeds.
However, where growers have problems with bromine, they should try to avoid growing barley because there are more options to control winter wheat.
Farmers with bromine problems should add acetochlor in the mixture. On barley, the use rate of fluorobenzene acetamide should be high, and it may require two use of products such as Firebird.
Those who have bromine problems in winter wheat have more choices. They can also choose to take the Broadway Star in the spring (need 8 degrees temperature), but the first herbicide to control bromine should be before or early after emergence .
Growers must also pay attention to growing oats on the land where Avadex Factor is used, and can not grow oats until 12 months after use.
Another option for grass and weeds becoming a problem is to apply a second herbicide to the headland if there is evidence of weeds later in the season, as the problem may spread from the headland to the field. Of course, this is only if the rates and tags allow it.
However, cultural control is the first line of defense, and all other options should be used to reduce dependence on herbicides.
For some farmers, it is too late to choose the next option, but delayed drilling can also help reduce the problem of weeds. The following chart from Teagasc describes the germination rate of grass weeds at different times of the year.
For example, if you look at sterile bromine, it will appear between July and November, so delaying the planting of winter barley to October will reduce the population, and delaying wheat until November can help reduce the plant population.
There are many weed control options out there, so make sure you apply the most appropriate weed to the weed spectrum. Related stories Observing the control of weeds after rape seeds emerge. 45% of cultivating farmers said that the use of technology is prohibited by cost
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