Clever rose black spots

Black spot disease is the most common devastating disease in various places. The main infested leaves also invade the shoots, petioles, flowers, stems, buds and flowers. The diseased spots on the twigs were initially oblong, dark purple, and slightly sagged. The spots on the pedicels are smaller. When the temperature rises to about 25°C and the humid weather with close to saturated air humidity, the disease is most serious. In the rainy season, the disease spreads fastest and the infection is heavy. In August and September, it was the peak period. In addition, planting too dense or poor ventilation on the site is also the main reason for this disease. Black spot prevention and treatment is generally based on prevention and prevention and control. The first is to select highly resistant varieties; the second is to improve the cultivation environment, and the cultivation site should be air circulated, with sufficient light, and at least 6 hours of light should be guaranteed every day. The cultivation soil should be breathable, and those with thin soil, hardened soil, and saline-alkali soil must not be well cultivated; third, the defoliation, dry branches, weeds, and wastes in the garden should be removed and burned to reduce the source of infection. At the same time, once the diseased leaf is found, it is cut off immediately. Do not touch the leaves of diseased plants with your hands to prevent human transmission. There are many drugs for the control of melasma. In the early spring, soil disinfection was performed with 1% of arsenic arsenic. Before the onset of disease, 75% of chlorothalonil 1000-fold sprays were used, and once every two weeks until the spread was controlled. It can also be sterilized with 800 times 70% Thiophanate solution. At the time of onset, 800 times 50% carbendazim solution can be sprayed. This medicine is resistant to rain erosion. Practice has proved that the use of traditional Bordeaux liquid to prevent rose black spot disease is still an effective method. Because this drug has strong adhesiveness in the wet weather where rose occurs, a thin film can be formed on the leaf surface, thus effectively killing the bacteria. Bordeaux fluid efficacy can be maintained for 2 weeks. Because of the long incubation period of the black spot pathogen, it is better to control the spraying time before the onset of the disease and the effect will be better. Bole multi-liquid 100 times liquid lime equivalent, to be with the current use, do not overnight. Spraying time should be selected in the evening, when spraying at high temperature, it is easy to produce phytotoxicity. China Agricultural Network Editor

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