Mulberry gray mold

Symptoms of leaves, male flowers, and mulberries can be affected. The leaves begin to grow at 3-27 cm when the leaves become infected. The lesion begins with the tip or leaf margin of the middle and lower leaves, and then gradually expands toward the main vein in the leaves. The disease area changes from dark brown to yellow-brown, and the leaf margins are mostly oriented. Foliage or leaves are rolled up. Male flowers dry after getting infected. Mulberry damage is rot. When the humidity is high, a grey to gray mold layer appears on the surface of the diseased part, which is the conidial stem and conidia of the pathogenic bacteria.

Pathogen Botrytis cinerea Pers ex Fr. Called Botrytis cinerea, a fungus belonging to the subphylum Fungi. Conidiophores erect, clustered, size 1334-181414-20 (um), with 1-2 branches at the top, conidia growing at the top of branches like grape spikes. Conidia are round or nearly round, unit cells, size 8.3-148-12 (um). The sexual state is Botryotinia fucke-liana (de Barly) Whetzel called Fokkerella sclerotiorum, belonging to the fungus Ascomycotina. In addition to mulberry infestation, it can also infect melons, eggplants, beans, sunflowers and other crops. The germ development is suitable for 10 to 23°C, 30 to 32°C, and 4°C, and humidity is a high humidity condition of 90% or more.

Transmission Pathway and Invasive Conditions Northern bacteria overwintered on the sick and deceased body, and a large number of conidia were produced in late spring for transmission; Southern pathogenic spores transmitted through the airflow and rain splashes for initial infestation and re-dyeing due to field host. It exists throughout the year, and infestations continue to occur from time to time. There is no apparent winter or late summer. The disease is a disease in the low temperature region. The conidiospores have strong resistance to drought and are easy to prevail under low temperature and high temperature conditions. Under warm and high humidity conditions, the disease condition also expands quickly.

Control methods (1) selection of disease-resistant varieties. (2) Strengthen the management of mulberry fields to avoid the occurrence of low-temperature and high-humidity conditions. Low temperatures not only weaken the vitality of mulberry trees, but also have long-lasting low temperature and low resistance. In case of high humidity, they are very susceptible to gray mold. Therefore, it is necessary to increase temperature and reduce temperature. It is a fundamental measure to prevent and treat this disease. (3) Remove disease prevention, concentrate burning or deep burial in time after autumn. (4) Reasonable watering and fertilization, timely drainage after rain to prevent the occurrence of disease conditions. (5) Protection can be sprayed if necessary. For specific methods, see Gray Botrytis cinerea.

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