Pear scab, also known as scab, mainly affects pear shoots, leaves, and fruits. Generally from the flowering stage has been harmed to the fruit mature period, the symptoms of the disease in the Department to produce a significant layer of black mold, it is also known as black mold. Leaf damage occurs in the back of the leaves, and grows black mold. The front of the leaf is polygonal or round chlorotic yellow spots. In severe cases, the leaves are covered with black mold layer on both sides, causing the leaves to dry and fall off. Petiole victims produce round or elongated molds that cause defoliation. In addition to the formation of shoots and moldy shoots, the shoots of the late shoots showed rough skin-like scabs. The victim of the fruit was initially a pale yellow spot and gradually expanded to grow black mold. Afterwards, the diseased part was scuttled and the growth was deformed and detached.
The occurrence of scab has a close relationship with rainfall. Recently, there are more rains in our area, and the temperature rises. Pear is common in high-temperature and high-humidity conditions. The township (street) agricultural technology centers must strengthen publicity, pay close attention, and timely. Do a good job of prevention and guidance.
Prevention of pear black spot disease should be as follows:
1. Agricultural control: implement fruit bagging to prevent pathogens from infecting and damaging the fruit; strengthen management of soil, fertilizer, and water, increase organic fertilizer, avoid excessive length of branches due to partial application of nitrogen fertilizer, and trim reasonably to improve the canopy Ventilation and light transmission conditions improve the disease resistance of the plants. For diseased leaves and fruits, they must be removed and burned in a timely manner.
2. Chemical control: Combine with the rainfall situation to prevent and cure. Normally, it needs to be used once after the rain, or once every 15 to 20 days for a total of 4 to 5 times. Common agents are: Bordeaux mixture (1:2 ~ 3:180 ~ 320) and 65% mancozeb WP 500 ~ 700 times, 50% carbendazim and 50% thiophanate-methyl WP 500 ~ 800 times liquid, 50% tetanus wettable powder 600 ~ 800 times liquid. In the early stage of spraying, 500 times of urea can be added, and potassium dihydrogen phosphate 300 to 500 times can be used in the middle stage, which not only increases the nutrition but also prevents disease.
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