Symptoms and control of water chestnut leaf blight

Water chestnut, also known as horseshoe, water chestnut, peony, mackerel, black taro, bodhi chestnut, pear, belongs to Monocotyledon Cyperaceae, perennial perennial herbs, oblate, pointed above, smooth and glossy surface, purplish red or dark brown, growing in the pond, dark green stems on the ground, underground corms can be eaten. People also call it a horseshoe because it is shaped like a horse's hoof. Its appearance is like chestnut, not only in shape, but also similar to chestnut in nature, taste, composition and function, and it is also known as "ground chestnut" because it is borne in the mud.

Distribution area of water chestnut

Water chestnuts are native to India. There are about 150 species of water chestnuts in the world, especially in tropical and subtropical regions. Cultivation has been recorded in China since the Western Han Dynasty. at present, there are more than 20 species and some varieties, mainly distributed in low-lying areas such as Guangxi, Jiangsu, Anhui, Zhejiang, Fujian, Guangdong, Hunan, Hubei, Jiangxi and Guizhou, and also in some parts of Hebei. Baihu Town, Lujiang County, Anhui Province is rich in high-quality water chestnuts, which is the largest "hometown of water chestnuts" in China. Qingshan Town, Lipu County, Guilin City, Guangxi is a nationally recognized "hometown of horseshoes". Lechang water chestnut in Shaoguan area of Guangdong Province is famous for its large size, thin skin, tender meat, sufficient moisture, sweetness, no residue and crispness and delicacy. In addition, Maoli Town, Shayang County, Jingmen City, Hubei Province is also a producing area of water chestnuts, which has been sold overseas and famous.

Nutritional value of water chestnut

Water chestnut is rich in nutrition, according to analysis: every 100 g fresh bulb contains protein 0. 5%. 8 ~ 1.5 g, carbohydrate 12.9 ~ 21. 8 g, fat 0. 5%. 3 g, crude fiber 0. 5%. 3 g, ash 0. 5%. 8 g, calcium 4 mg, phosphorus 45 mg, iron 0. 5%. 8 mg, and small amounts of carotene and vitamin C. The phosphorus content in water chestnut is high in rhizome vegetables, which can promote human growth and development and maintain physiological function, which is of great benefit to the development of teeth and bones, and can promote the metabolism of sugar, fat and protein in the body. regulate acid-base balance, so water chestnut is suitable for children to eat.

Symptoms and control of water chestnut leaf blight

Water chestnut leaf blight is an important disease in the process of water chestnut cultivation. The disease occurs in all the water chestnut cultivation areas, and the harm is serious.

Symptoms of water chestnut leaf blight: in the early stage of the disease, needle-sized black spots appeared on the tubular leaves, and the periphery of the black spots faded to yellow. with the development of the disease, the black spots expanded into round or oval black spots with a diameter of 2-4 mm, and turned yellow around the spots. When the disease is serious, a large number of tubular leaves are yellow and withered from July to August, losing photosynthesis, and the underground bulb (water chestnut) is very small or can not be formed, which seriously affects the yield of water chestnut. The pathogen overwintered on the diseased remains in winter and produced conidia to spread and infect the plant during the growing season of water chestnut the following year.

The control methods of water chestnut leaf blight are as follows:

The main results are as follows: 1. Remove the diseased and residual body in the field in time, take it out of the field and burn it or pile it up and use it as fertilizer after it is fully ripe.

2. At the initial stage of the disease, 40% Hekuling wettable powder 60-80 g or 50% mancozeb wettable powder 100 g or 50% carbendazim powder 50 g plus 15% triadimefon powder 50 g was mixed with 40-50 kg water, and the seriously diseased field was sprayed once every 7-10 days, and the control effect was more than 90%.