When the disease occurs during the flowering of camellia, there are a number of brown spots on the blossoming petals that are of different shapes and shapes, and sometimes even aggregated into large patches. In severe cases, the entire flower becomes dark brown and falls off. If brown spots appear from the base of the petals, the central part of the flowers will dry out. The disease is also called flower rot. Fall is generally low in autumn, and from December to March of the following year, with the increase of temperature, the damage rate of flowers increases. The pathogen of camellia flower blight is the two fungi of the genus Physalospora. The bacteria lived on soil and diseased plants with hard sclerotia and survived for more than two years. In the early spring each year, sclerotia germinate, producing ascospores, which are transmitted through the airflow to the flower plants to harm the plants. At low temperatures (10 to 18°C) and abundant rainfall, it is most susceptible to disease. The pathogenic bacteria can also be transmitted through long-distance transportation of cut flowers and seedlings.
Control measures: 1 It is necessary to strengthen the quarantine of Camellia seedlings to prevent the spread of germs from a distance. 2 To remove the withered diseased flowers in time. 3 To cover the roots of camellia plants with a layer of pentachloronitrobenzene-containing medicinal soil or wood chips as a barrier. The preparation method of the medicinal soil is: using 40% pentachloronitrobenzene (soil powder) powder, according to the ratio of 1:100, with the new soil. 4 Use chemical control, that is, spray 50% of Formamide WP 500-800 times to prevent bacteria from infecting.
In addition to susceptibility to flower blight, camellia often suffers from dead branches. The twigs of camellia plants were impregnated with pathogenic fungi, causing the shoots to die and die. For the treatment of dead tree disease, the following control methods can be adopted: during the winter repair, the diseased branches are cut off and burned; before germination of the new shoots, fungicides such as thiophanate-methyl, thiazin, chlorothalonil, and chlorothalonil are sprayed, especially at the wound sites of shoots. To spray more; apply more phosphorus, potassium, to enhance the disease resistance of Camellia plants.
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