How to treat the disease of Chinese rose

Rose is the queen of flowers, fragrant and often blooming all the year round, is a common ornamental flower. But rose is also easy to be infected with diseases, so how to treat rose diseases?

First, rose powdery mildew

1. Symptoms: chlorotic macula appeared at the initial stage of the diseased leaves, then enlarged and covered with raw white powder, reverse curling, wrinkling, thickening, slightly inflated petiole and tender shoots after infection, reverse bending, flower posture deformity after infection of flower buds. In severe cases, the leaves are withered and yellow and the plants are weak.

two。 Prevention and treatment methods: to prevent the disease, we should pay attention to ventilation, do not plant too closely; the air is not too d increase light; apply more phosphate fertilizer. At present, the best medicine for the prevention and treatment of this disease is BASF's Cuibei (1 gram mixed with water 3 to 5 jin), Italy's Isabel (1ml with 3 jin of water) dispensing tools can choose syringes. For prevention, you can choose slightly toxic Polaroid (1 gram to 1 jin of water).

Second, black spot of rose

1. Symptoms: rose leaves, pedicels and twigs can be damaged by brown seeds to brown spots at the initial stage, then expand and become black or dark brown, often surrounded by yellow halos, and in severe cases, all the leaves in the middle and lower parts of the plant fall off, resulting in branch death.

two。 Control methods: timely removal of diseased leaves, heavy pruning of diseased plants in winter. The growing season is often pruned to keep it well ventilated. Can be used Yisabao (1ml water 3 jin), 20% difenoconazole microemulsion (1ml water 3 jin), diazepam (1 gram to water 5 jin) to prevent. For prevention, you can choose slightly toxic Polaroid gold (1 gram to 1 jin of water)

Third, rose leaf blight

1. Symptoms: occurred in the rose leaves, yellow-green needle spots appeared in the initial leaves, the disease spots expanded in a round or irregular shape, the edges were purple, after expansion, the disease key boundary was obvious, small black spots appeared in the later part of the disease, and the edges of the diseased leaves were burning.

two。 Prevention and treatment: remove and destroy the diseased leaves in time. Select disease-resistant varieties, reasonable close planting, and strengthen maintenance. It can be sprayed with 75% chlorothalonil wettable powder 500-800 times. American Dow Yinong Green Dasheng (1 gram to water 1 jin), Germany Bayer's Antaisheng (1 gram to water 1 jin). In the early stage of the disease, carbendazim and other agents were sprayed for prevention and treatment.

Fourth, rose mosaic disease

1. Symptoms: mainly manifested as flowers and leaves, some with annular spots or oak leaf patterns, and some with chlorotic spots, yellow veins or dwarfing.

two。 Prevention and treatment: avoid using diseased plants as breeding materials. The diseased plants were removed and destroyed in time. Disease-resistant varieties or tissue culture seedlings were selected. Pay attention to the prevention and control of aphids and other transmission media during the growing season. In the early stage of the disease, aminooligosaccharides were sprayed to inhibit the spread of the virus.

Rose needs careful care, although it is easy to raise, but it is easy to breed diseases and insect pests, so it is necessary to do a good job of management.