Expert advice

Tarcza Łan Extra 250 EW – control of fungal diseases of rape

The agricultural technology for winter rape in autumn is very complicated – one needs to constantly monitor the plantation looking for agriphages – weed, vermin and diseases. Even if one may control weed with a soil treatment, then illnesses and vermin are something that rape growers have to control all autumn.

The most important illnesses of winter rape necessarily include  blight of crucifer plants and blackleg disease of brassica. The threshold of economic harm for these diseases amounts to 20-30% and 10-20% of attacked plants, respectively. A heavy infestation of plants with these diseases reduces the assimilation area, at the same time hampering the general health of the plants. Winter rape expresses energy to fight the disease, and not to develop its overground and underground part. The plants enter the winter rest period with a lower leaf count and more shallow root system, causing them to be more susceptible to freezing; they may also have lower growth potential after growth restarts. To secure fungicial protection of winter rape, we recommend treatment using the product Tarcza Łan Extra 250 EW. The product was developed from scratch at the laboratories of Ciech Sarzyna, permitting the addition to it of appropriate additional ingredients, securing high quality of the EW formula. They ensure the optimum „spread” of the drop of the sprayed liquid on the surface of the treated plant, and quick penetration of the active ingredient to the inside of the plant. The active ingredient, moving in the rape plant, starts to act preventively, and at infected spots, depending on its progress, acts as a treatment or destructive agent. The proper selection of auxiliary ingredients used during the design of Tarczy Łan Extra 250 EW was confirmed by high effectiveness in the reduction of pressure by diseases of winter rape during registration trials for the product conducted at entities accredited by the Polish Ministry of Agriculture and Rural Development.

The winter fungicidal treatment should fulfil three functions – the first is limiting the pressure of diseases, the second, equally important – is influence on the plants, so-called 'shortening of rape', and the third is influence on winter resistance of the rape.  Control of the plant size ensures a periodic reduction of the stalk growth – the top bud is found low over the ground and is surrounded by leaves. The root neck is also thickened, and the root system develops more intensely. In case of improper shortening of the winter rape plant, they have a high top bud, and such plants are decidedly more susceptible to damage during the winter, or even total freezing.

Control of the blight of crucifer plants and blackleg disease of brassica in autumn is very important, as the ill plants that survive the winter will pose, in the spring, a source of infection for other rape plants.