The pathogen is Streptococci. Damage leaves, sick leaves fall early. Parks and homes planted with smiles all over Zhejiang.
Symptoms Symptoms of needle-shaped spots occur early in the onset of the disease, and yellow halo bands surround the area. Most of the bacteria invade from the leaf tip or leaf margin, and the lesions can expand to form round, oval or irregular shaped patches. The lesions were dark brown to gray-white, with round markings, dark brown edges, slightly elevated, central dispersal of disease or brownish-black dots in turn, and pink gel-like substances in wet weather. This is the breeding of germs. Spore disks and conidia. Finally, the leaves yellow off.
The onset of pathogenic bacteria is overwintering on diseased tissues or fallen leaves with mycelium or conidium discs. In early March each year, the conidium matures and spreads with the wind and rain. Most of the bacteria invade from mechanical injury, insect injury or sunburn wound. From May to June, it was a period of high onset, and the high temperature in summer was relieved. From October to November, there were diseases. Most bacteria damage the lower leaves of plants. Lack of fertilizer, lack of water, leaves chlorosis, the most susceptible.
Control methods
(1) Do a good job of preventing and controlling diseases in the production areas and avoid spreading them to non-epidemic areas.
(2) The diseased leaves were immediately removed and incinerated to minimize the re-dissemination source of the treatment.
(3) The bacteria spread by rain. In autumn and winter, the diseased plants and debris should be cleaned. Potted camellia should pay attention to disease and healthy plants separately. Sprinkler irrigation should be avoided when watering, to reduce the spread of germs.
(4) Chemical control can use 70% thiophanate-methyl WP wettable powder 1500 times, new high fat film, 50% Benzol WP 800 times spray, 7-8 days spray once, or 50% carbendazim 800 times, or 1% Bordeaux, or 75% chlorothalonil 500 times, once every 8 to 15 days.
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