Turf: The main problems with turf
In autumn, the lawn cannot maintain the typical lush and intense green color, like all plants in this period it slows down the growth and the roots cannot absorb the necessary nutrients. The modest appearance of our lawn may prevent us from recognizing the symptoms of certain fungal diseases which, if not treated in time, can cause the gradual deterioration of the turf. Their diffusion is favored by conditions of high humidity, by the scarce fertility of the soil and by the low vigor of the turf.
The "aggressors" of the lawn can attack the root or leaf apparatus, and the main pathogens to defend themselves from are:
Gaeumannomyces graminis, an agent of sore feet, infections occur mainly on the turf of Agrostis spp., The disease is manifested by circular brown spots that can reach one meter in diameter. Often the center of the patch, where the carpet is dead, is invaded by weeds. The greatest damage can occur on poorly drained soils with a high pH.
Magnaporthe poae, agent of the summer bush, attacks mainly Poa and Festuca. The disease manifests itself with tendentially circular spots of a few cm in diameter which at most reach 30 cm. The leaves first become light green and then brownish red. They favor the development of the pathogen poorly drained areas and low cutting heights.
Leptospheria korrae, an agent of the necrotic ring spot, affects the essences of the genus Poa. The spots are circular, about 30 cm in diameter, with leaves first reddish then yellow straw. It develops in conditions of high humidity.
Phytium sp., Fusarium spp., Rhizoctonia spp., Agents of typical turf rot, can affect both the leaf and root system. In Agrostis spp. the disease is manifested by yellowing of the leaf apparatus which, in other species of essences, can be brown. Massively affected areas quickly become bare. These pathogens are very active in humid conditions and with temperatures between 4 and 15 ° C.
Sclerotic homeocarpa, agent of sclerotiniosis (Dollar spot), a very common disease in grass meadows and especially in those cut more frequently. The symptoms begin with an intense discoloration which subsequently leads to necrosis. Small circular patches can be seen, depressed with respect to the carpet, generally no more than 5 cm wide; as the infection progresses, the patches can join up to form irregular patches.
Moss, a plant belonging to the class of bryophytes, is another aversion that can develop on lawns in wet and cold weather conditions. The attack of insects, lack of aeration, poor drainage, excess of shade or too low shearing are all factors that lead to the formation of a weak and sparse turf that allows the moss to settle. The moss creates a felt on the surface of the lawn that prevents the aeration of the roots and limits their normal growth.
In order to have a lawn in excellent vegetative and aesthetic conditions in the spring, it is necessary to follow some essential operations among which ventilation is fundamental; in fact, this allows the penetration of air, nutrients and water. In this way the water will circulate more easily, penetrating more deeply, avoiding superficial stagnation and therefore the development of any fungi.
If the rains and the development of the turf lead to a progressive impoverishment of the fertility of the soil, it must be restored with adequate fertilizers. The turf needs high amounts of nitrogen to allow the development of the leaves, phosphorus for the development of the roots and potassium to give strength and resistance to the grass.
The ideal solution is to administer a complete granular fertilizer such as Granverde Concime Mineral for lawn.