Expert advice

Spring control of weed in winter rape using the product Labrador Extra 50 EC

The early part of spring is the last moment to perform herbicidal treatments on winter rape – some plantations require the control of dicots, with monocots left over after winter being a greater problem.

The most common and most burdensome include self-seeders of winter cereals that accompany the winter rape crop from the time of sowing onwards. They compete with the crop, demanding water and nutrients, densifying the field overly – limiting ventilation and drying, at the same time creating [favourable] conditions for the development of fungal and bacterial diseases. In addition, upon the restart of growth, self-seeders develop more quickly and markedly hinder the development of rape, which in such a case is unable to unfold its full potential.

Monocots of winter rape are not only cereal self-seeders, among the equally difficult one must include couch grass. Due to heavy competition, it can markedly reduce the growth of seeds, and its stalks may protrude above rape across the entire field. This leads to excess densification and, beside the facilitation of disease, to delayed maturity and a more difficult harvest by combine harvester.

One also needs to keep in mind that monocots being weed of winter rape can be a source of disease for other crops growing nearby.

In order to limit the pressure of monocots, we recommend treatments by using Labrador Extra 50 EC at a dose suitable for the dominant crop. In order to control advanced-growth weed, we recommend the use of the higher doses, and for the elimination of the common couch, one utilises the maximum dose of 2.0 l/ hectare. We recommend using Labrador Extra 50 EC as early as possible, however, the broad window of spring application until the 'green bud phase' permits the execution of an interventional treatment at later stages of winter rape growth, with the maintenance of full safety of the crop.

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