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Rice sheath blight
The stalk blight is commonly called "flower stalk". Why do you have this title? It is a disease that you have spent on rice stalks. This disease is caused by fungi, it is called rice beriberi disease, it seems that the foot of the person's athlete's foot is also the same as that caused by fungi. This disease is one of the three major diseases of rice. In recent years, due to rice cultivation and restructuring, as well as the improvement of cultivation calendar level and fertilization amount, the disease has become more and more serious. Generally, early rice incidence is heavier than single-season late rice and later-season rice. Granular grouting (what is grouting, you need a lot of nutrients when you are still embryos, grouting is the stage of plant fertilization embryos). The disease causes the plants to wither and fall, can not head, or the head is not strong, and the serious field yield can be reduced by more than 50%. Remember that it is not 10%, not 20%, but 50%.
First of all, how to identify the cause of this disease is still there:
Sheath blight is a high-temperature, high-humidity disease, which is the same as that of people with athlete's foot in summer. The disease usually begins to develop at the end of the tillering. (The tillering period, after you plant the next seed, Bifurcation forks and bifurcations, a bit like the three-headed six-armed arm, but this arm is more.) Jointing period to the heading period. (The jointing period is the sun and the fertilizer, the rice is stretched upwards, and the growth period is rapid, that is, human adolescence. At this time, it is relatively active, lively and easy to be injured.) In the early stage of rice sheath blight, an elliptical dark green water-stained lesion appears on the near-water leaf sheath (this is the thing wrapped around the leaves and stems). (You can remember the ellipse here. The green hat is gradually enlarged into a cloud pattern, which is a bit like the white moir that formed when a child wets the bed. Haha, but the middle is grayish white and grayish green when wet. The lesions are expanding from the bottom to the top and gradually increasing. That is to expand from the foot to the leg. The diseased spots on the leaves are similar to the leaf sheath lesions. The damage to the neck of the ear becomes wet black and blue. In severe cases, the whole ear is dead, and it is estimated that if the athlete's foot grows to the neck, it will be blue-black. If it is serious, it will definitely be a fart. When the temperature is high and the humidity is high, the mycelium of the diseased part gathers into a group on the surface, first white, and later becomes a dark brown hyphae, which easily falls off after being matured and falls into the soil. (What is hyphae, hyphae is only a structure of fungi, with a family usually composed of fathers and mothers, hyphae are individuals)
The pathogen mainly uses the sclerotia to overwinter in the soil (the sclerotia is that many hyphae grow to a certain extent, and when it is cold in winter, it is warmed up), and the mycelium and sclerotia can also be used on sick straw and other host residues. winter. In the second year, this odious Gege Wu, wrong, is a damn sclerotium floating on the water surface with irrigation, lurking on the rice plant, producing hyphae at a suitable temperature, invading the leaf sheath, causing the disease: then the diseased part produces hyphae Rice is spread in the upper or adjacent rice.
Secondly, let's talk about the conditions of this disease, and it is also conditional for the infection of athlete's foot.
1, excessive close planting, excessive or too late to apply nitrogen fertilizer, rice steep and long green; shallow water, poor drainage, poor ventilation, high humidity in the field, accelerate the elongation and spread of hyphae, are conducive to disease, simple It is said that you are athlete's foot in the summer, you wear a small, stuffy and wet leather shoes, give it a try, take two steps.
2, the highest incidence in high temperature and high humidity environment, the field microclimate in the 25 degrees to 32 degrees, in the case of continuous rain, the disease develops particularly fast, you know no, the ancient people's house leaks even rain, it is from here, remember However, when the temperature is high and the rain is over, it will be unfortunate.
3, the varieties of dwarf stalks and multi-ears are densely distributed and are susceptible to disease. If you are short, you will be short. If you are fat, it will be awkward, it is a stone.
Third, prevention measures.
The book is based on agricultural control, paying special attention to the management of fertilizer and water, and using pesticide protection for fields with serious episodes.
1 Agricultural control
1, reduce the source of bacteria; deep ploughing of rice fields, buried the sclerotia of the bacteria deep in the soil, so that he will never have a day, this can be done. After the paddy field is filled with water, the scum is removed to reduce the source of the disease. This is what experts say, the peasant brothers must throw eggs and throw experts. Combined with fertilization, eradicate weeds in the field and eliminate the wild host of the bacteria. Farming is also combined with actual grounding gas.
2 Strengthen the cultivation and management, take the appropriate close planting as the center, adopt the corresponding fertilizer and water management measures, apply the base fertilizer, apply the fertilizer according to the seedling condition, and increase the application of phosphorus and potassium fertilizer: the early stage of growth, shallow water irrigation, medium-term field, dry field, dry later Wet and wet, so that the rice is stable and not prosperous, and it is not greedy, does not fall, and enhances disease resistance.
Hey, Xiao Li has so many nonsense, the most important and practical moments are coming soon. Don’t look at your eyes and look carefully. The following is very exciting. If you miss it, you may regret it for life. Chemical control, generally in the early stage of the disease for the first time, and then spray again every 10 days or so, for a course of treatment. Specifically, depending on the weather and the development trend of the disease at that time, the medicinal agent can be selected, and each 666 can use 70% of the Jinggangmycin soluble powder 70g, or 6% Jinggang. The acne WP can be 80g, and the cargo is 20%. 100 g of suspension of dental bacillus, spray 40_50 kg of water according to different growth stages of rice, 240/l of tilfuramide per 666 squares for severely affected fields
Suspension 20 ml spray treatment. Originally there are pictures uploaded, but unfortunately can not pass, then forget it, everyone can make it look, it is estimated that this website has a problem. If you look at the inconvenience to see the WeChat public account, where will the technology be used every day.
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