There are some ways to control the brown spot of sweet-scented osmanthus.

Sweet-scented osmanthus brown spot

Sweet-scented osmanthus brown spot is a very common disease, which seriously causes fallen leaves of the whole plant, affecting flowering and viewing. Aunt Fu, a retired member of Guiyang Huayu and Garden Bureau, told reporters that it takes a little patience to prevent and control sweet-scented osmanthus brown spot.

The main manifestations of sweet-scented osmanthus brown spot are as follows: when the pathogen infects the leaves, the damaged leaves begin to appear small macula, and then gradually become yellowish brown to grayish brown, the disease spot is nearly round or irregular, or polygonal spots due to the limited expansion of leaf veins. There is a yellow halo outside.

The disease department will produce black mildew spots in wet weather, which are the conidiophores and conidia of the pathogen. The pathogen of sweet-scented osmanthus brown spot overwintered on diseased plants and fallen leaves by mycelium and became the source of infection at the beginning of the next year. Conidia are produced in late March every year and begin to infect. Conidia are transmitted by airflow and raindrops and can invade directly or from wounds and natural orifices. Old leaves are more susceptible than young leaves. Brown spot occurred from April to October and subsided after November. High temperature and humidity are beneficial to the disease. There are differences in resistance among varieties. generally speaking, the disease resistance of Dangui is stronger than that of Jin Gui and Yingui.

How to control the brown spot of sweet-scented osmanthus? Tips:

1. Combined with pruning, removal of diseased leaves, removal of underground fallen leaves, concentrated burning or deep burial, reducing the source of primary infection for two consecutive years, it will be effective.

two。 Strengthen cultivation management, avoid stagnant water in soil, pay attention to ventilation and light transmission. Increase the application of humus fertilizer and potash fertilizer to improve plant disease resistance.

3. During the onset of the disease, the Bordeaux solution can be sprayed with 1V 2v 100 lime Bordeaux, or 50% benzoate wettable powder 1000 kg 2000 times, or 20% azine 500 Mel 800 times, or 50% Dysenamine 1000 times.

There are some ways to control the brown spot of sweet-scented osmanthus.

Sweet-scented osmanthus brown spot

China Garden Network, October 16, news: sweet-scented osmanthus brown spot is a very common disease, seriously leading to fallen leaves of the whole plant, affecting flowering and viewing. Guiyang Huayu and Aunt Fu, retired from the Garden Bureau, told reporters that it takes a little patience to prevent and control sweet-scented osmanthus brown spot.

The main manifestations of sweet-scented osmanthus brown spot are as follows: when the pathogen infects the leaves, the damaged leaves begin to appear small macula, and then gradually become yellowish brown to grayish brown, the disease spot is nearly round or irregular, or polygonal spots due to the limited expansion of leaf veins. There is a yellow halo outside.

The disease department will produce black mildew spots in wet weather, which are the conidiophores and conidia of the pathogen. The pathogen of sweet-scented osmanthus brown spot overwintered on diseased plants and fallen leaves by mycelium and became the source of infection at the beginning of the next year. Conidia are produced in late March every year and begin to infect. Conidia are transmitted by airflow and raindrops and can invade directly or from wounds and natural orifices. Old leaves are more susceptible than young leaves. Brown spot occurred from April to October and subsided after November. High temperature and humidity are beneficial to the disease. There are differences in resistance among varieties. generally speaking, the disease resistance of Dangui is stronger than that of Jin Gui and Yingui.

How to control the brown spot of sweet-scented osmanthus? Tips:

1. Combined with pruning, removal of diseased leaves, removal of underground fallen leaves, concentrated burning or deep burial, reducing the source of primary infection for two consecutive years, it will be effective.

two。 Strengthen cultivation management, avoid stagnant water in soil, pay attention to ventilation and light transmission. Increase the application of humus fertilizer and potash fertilizer to improve plant disease resistance.

3. During the onset of the disease, the Bordeaux solution can be sprayed with 1V 2v 100 lime Bordeaux, or 50% benzoate wettable powder 1000 kg 2000 times, or 20% azine 500 Mel 800 times, or 50% Dysenamine 1000 times.

Control of Brown spot of Osmanthus fragrans

Sweet-scented osmanthus brown spot is a common disease of sweet-scented osmanthus, which is caused by subphylum fungus infection. Sweet-scented osmanthus plants are planted in ground and potted plants. Light cases affect the ornamental effect, and serious ones cause plant death.

Most of the symptoms occurred in the leaves, and most of them developed from the leaf tip and edge to the whole leaf. At the initial stage, the plaque was light gray, and then it showed irregular fan-like expansion. In the later stage, the plaque gradually dried up and showed brown, with black grains.

The occurrence regularity of the pathogen overwintered on the diseased body of the plant and spread by means of wind, rain and watering, and the disease was the most serious from the end of spring to the Mid-Autumn Festival in the north.

Prevention and control methods 1. Remove the remains of diseased plants in time; 2. Strengthen water and fertilizer management and enhance plant disease resistance; 3. The sprouting environment should be ventilated and transparent, do not spray during the disease period, and avoid rain; 4. Timely control of shell insects, aphids and other piercing pests; 5. Spray 500 times of 70% mancozeb wettable powder twice before entering the house at the end of autumn; 6. If it occurs, you can use 90% chlorothalonil 500 times or 50% carbendazim 500 times for prevention and control.