The common disease of Begonia sinensis is rust of pears, also known as pears. The disease is infested by two hosts. The first hosts are cypresses, such as cypress, cypress, and horned cypress, etc. The second hosts are escarpmented sea bream, escarpment, and hawthorn.
After the bacterium invades the cypress, etc., it will produce a pale yellow spot on the leaves or twigs in the first year and then grow swollen. In the second and third months of the next year, brown rice grains will be produced, breaking through the epidermis, and will be the teliosporn angle. The cystic horns are solitary or polysperous, making the shoots swell.
After the stem borer was used as the second host to infect the winter sporangia, the front of the blade appeared yellow-green spots in the early April-May, and then expanded into round yellow spots. Several small yellow dots will appear early in the lesions and become black later, gradually thickening the corresponding parts of the back of the leaves, giving off some grayish white hairs, and turning into yellow-brown powders from August to September. In severe cases, the diseased leaves are full of plants, and the leaves are deformed and the surface is uneven. As a result, the leaves sooner or later fall off and even cause the plants to die.
Control methods: 1 The first host is not planted in the vicinity of the peduncle. In the onset of the disease, it was sprayed with 20% Freundling EC 400 times. Or use 50% of WP WP 800 times and spray once a month. Do not spray or spray less when the weather is dry. 6 When the midwinter fillet angle in mid-March is about to expand, use a 0.3% sodium pentachlorophenol solution plus lime sulfur mixture to form a 1 degree Baume mixture, and spray 2-3 times for half a month.
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