Rose yellow leaves all over the ugly spot how to do?

There are black, brown and yellowish spots on the green leaves of the rose for no reason, but many flower friends mistakenly think that the rose is deficient in nutrition and rush to replenish the rose, but it is not. Rose has yellow leaf "all over the face spot" ugly, mostly caused by black spot, what should we do?

Rose black spot disease is mainly harmful to leaves, at first, the leaves are no longer green, appear light green or light yellow, slowly show black spots of different sizes on the leaves, then the spots will expand, and show a yellowish brown dark purple, and eventually become grayish brown, and in serious cases, it will lead to the death of new branches, and all the lower leaves of the rose will fall off, becoming the "light rod commander".

If your family's rose is sick, do not panic, do not be confused, first according to the symptoms, determine the cause of the disease, and then prescribe medicine for prevention and treatment. When black spot occurs, first of all, it should be completely cut off and burned centrally in order to reduce the source of infection. At the initial stage of the disease, 50% carbendazim wettable powder was sprayed 1000 times, twice a week. Secondly, trim the leaves that have dark spots, and pay attention to the ventilation and light of rose potted plants, which can reduce the spread of germs.

If there is a large area of black spots, carbendazim is ineffective many times, and 65% of Dyson zinc wettable powder 500ml 700 times liquid spray. The frequency of spraying depends on the incidence of the disease, start spraying for the first time, and then spray once every 7-10 days, and speed spray 2-3 times. After maintenance, spray as little water as possible on the leaves to keep them dry.

After half a month of prescribing the right medicine, the leaves of the rose will grow again, and the roots can be properly nourished at this time. The rose liquid fertilizer with balanced nitrogen, phosphorus and potassium can be selected, which is no different from the original plant fermentation. it is especially favored by flower lovers who pursue healthy flower planting and love convenience and sanitation. After dilution, the soil contains plant chelated state, which can supplement the disease of rose.

Prevention is better than medicine, growing flowers, especially rose, or don't be lazy. Often thinning branches and cutting leaves, retaining strong branches, so that rose branches and leaves are ventilated and transparent, light is sufficient, thin fertilizer is applied frequently, so as to reduce diseases and insect pests, bloom more and grow better.