In the middle and early August, the peak level of rice sheath blight was extended. The reporter learned from the Provincial Plant Protection Station that due to the long period of plum rain, high humidity in the field, high temperature and other factors, rice sheath blight in our province has been rising rapidly. Should pay close attention to medication control. Glucose Test Strips,Best Blood Glucose Meter,Blood Sugar Test Machine,Glucose Monitoring System Wuxi BioHermes Bio & Medical Technology Co., Ltd. , https://www.biohermesglobal.com
According to Zhu Feng, Plant Protection Station of Jiangsu Province, in late July, rice in our province entered the end of childbirth, and the degree of depressive coverage in the field has increased, and the speed of the disease has accelerated. Currently, it has entered the stage of initial expansion. Due to the long period of rainy season and heavy rainfall in our province this year, some regions were not able to timely put down the field or put the fields in a bad condition due to rainfall. The humidity in the field was large, and the temperature rose rapidly after the plum blossom, and the process rainfall was frequent and the weather conditions were very high. It is conducive to the occurrence and spread of sheath blight. According to a survey conducted by the Provincial Plant Protection Station around July 25, the incidence rate of Rhizoctonia solani in the rivers, hills, and Huaibei area was 5% to 30%, and that of high plots was 35% to 80%; the rate of diseased plants was 0.5% to 5%. , high up to 5% to 20%, the disease is generally heavier than the same period last year. Early planting is more important than proper transplanting. The transplanting field focuses on the direct field, and the Lixia River, the hills and the Huaibei area are more important than other areas.
Zhu Feng said that due to the high proportion of susceptible varieties, large populations of rice fields, and favorable weather conditions, the incidence of rice sheath blight in our province has generally been above-average and above, and field bacteria are abundant. If there is continuous high temperature and multi-process rainfall in the future, the disease will be further aggravated, and it will enter the peak of vertical expansion in late August, directly harming the upper functional leaves of rice. In order to control the development of the later stages of illness, the current compliance field block should actively carry out prevention and control, control the early use of drugs in the early stage of disease, and control the rate of expansion, and then the degree of morbidity in the fields should be treated scientifically.
In the control of rice sheath blight, Jinggangmycin was the most commonly used drug in the past. In the case of severe occurrence of sheath blight, agents with protective and therapeutic effects such as propiconazole, epoxiconazole, and tebuconazole may be used as appropriate. 12.5% ​​fluorocyclodazole suspension, 15% Jinggang propiconazole wettable powder, 11% Iigandroconitol wettable powder, 43% tebuconazole suspension, 30% benziconazole emulsion, 24% full spike Furamide suspension has good control effect on rice sheath blight (control effect is about 75%), and the control effect is more than 15 days, and the effect of disease prevention and production guarantee is good. Note alternate use of different agents to delay drug resistance.
To prevent and cure rice sheath blight, in addition to the selection of quasi-drugs, we must also pay attention to medication methods. To use the amount of water sufficient to apply to the base of the rice plant, especially for high-tarden plots, standardized drug use methods can greatly improve control efficiency.
Linkage to the data: Rhizoctonia solani is resistant to high-temperature and high-humidity conditions, and it is easy to develop in the conditions of rice fields, high temperature and high humidity. Single-season mid-late rice usually reaches the peak of disease in the late period of tillering and heading. From the tillering period to the booting stage, it spreads horizontally between the plants or between rice stalks (horizontal expansion), which increases the diseased plant rate or the diseased culm rate; then it develops (vertically expands) from the lower leaf sheath to the upper leaf sheath, and the severity of disease increases. Ten days before and after heading, the development of the disease reached a peak period, and the spread of lesions was slow after the milk ripening period. According to the occurrence characteristics of sheath blight of rice, after the diseased plants are found in the tillering period, they should be used as soon as possible to prevent the horizontal spread, and it is better to control the spray before the rice is sealed. During the field period, the humidity in the field decreased, and the occurrence of sheath blight was inhibited. After the field was rehydrated, the disease continued to spread in the field and it was necessary to prevent and treat the disease in time. Chemical control indicators: at the end of the tillering stage, when the indica rice singling rate reaches 20%, and the indica rice singling rate reaches 30%, the first application of the pesticide; from jointing to the booting stage, when the indica singling disease rate reaches 10% to 15%, the indica disease The pesticide was applied at a rate of 20%; when the diseased hole rate reached 30% to 40% after heading, the pesticide was applied.