Return of straw to the field can reduce the occurrence of head blight
In order to do a good job in preventing and treating wheat scab, and raising the level of prevention and control technology, the National Agricultural Technology Center recently held a training course on scientific technology of wheat head blight in Hefei from Jiangsu, Anhui, Hubei, Henan, Shaanxi, Shandong and Hebei. Seventy-seven provincial plant protection stations in areas frequent with wheat head blight, as well as more than 120 technical staff of plant protection stations in relevant cities and counties in Jiangsu and Anhui Province participated in the training. At the training meeting, experts predicted that this year's wheat scab has a higher prevalence risk in the middle and lower reaches of the Yangtze River and the southern wheat region of Huanghuai. Professor Kang Zhensheng from the Northwest A&F University pointed out that, in addition to the lack of disease-resistant varieties, extensive field management, and single prevention and control of pesticides, the risk of wheat head blight prevalence will be greatly increased if measures to reduce straw return are not achieved. “Fusarium head blight is a typical flowering invasive disease. The rainy weather at the heading and flowering stage will help the release and germination of the ascospores of pathogens, and the invasiveness and expansion of pathogens.†It is understood that more than 90% of the varieties of wheat grown in China All of them are susceptible to head blight. If we encounter rainy weather during the heading and flowering period of wheat, it will increase the risk of head blight. In addition, blindly pursuing yield, high planting density, and confined fields have also caused the epidemic of diseases. According to reports, wheat cultivation in our province is mostly wheat-wheat rotation and wheat-maize rotation. In fact, this planting system provides abundant infection host and survival matrix for Fusarium head blight. “In many areas, the technology and mechanical level of straw returning are not in place, which makes a lot of straw stay on the soil surface, providing a very favorable place for the formation and development of the capsid shell of the Fusarium head blight, and will increase the amount of pathogenic bacteria in the initial infestation.†Kang Zhensheng Say. To cope with the problem of wheat head blight, experts suggest that disease-resistant wheat varieties should be selected, scientifically used according to the weather conditions, and the straws should be handled properly: First of all, we should try to choose disease-resistant varieties. At present, a large number of high-yield products with anti-bismulism have been bred, such as Yangmai 4, Yangmai 5, Yangmai 158, Yangmai 14, Yangmai 17, Ningmai 9, Ningmai 16, etc. . Second, according to the weather conditions, spraying control. Occurrence in northern Fujian Province is a sporadic region of head scab, and in southern Fujian Province is a predominant area. Sporadic districts must decide whether to spray pesticides according to the weather forecast; Changfa district can adopt the “prevention-based, active attack†disease prevention strategy, heading the flowering period for the first time, according to the weather to determine whether to use the second drug. Finally, in the selection of agents for controlling Fusarium head blight, the risk of susceptible to single-agent use should be avoided. “Carbendazim is the most important and commonly used chemical agent for the prevention and control of wheat scab in China. However, single or repeated use of carbendazim for a long time can easily lead to resistance to FHB, which has been banned in foreign countries. The use of mycelium," explained Kang Zhensheng. According to reports, when the proportion of resistant strains reaches 10%, the control effect of carbendazim drops to 60%. Therefore, when the proportion of resistant strains exceeds 10%, carbendazim and tebuconazole can be used together, or cyanogens can be used. Ester and other control of scab. When the proportion of resistant strains reaches 5%, polyketone control can be used to avoid single use of carbendazim. In addition, Kang Zhensheng also suggested that the management of wheat fields between wheat fields and corn stalks should be handled properly. It is recommended that the height of stubble must be below 10 cm, and the depth of returning field should be 10-15 cm. The chopped straw should be returned to 10 cm. The following soil layers can avoid the negative effects of straw returning and reduce the source of pathogens. Disposable Urethral Catheter Kit Catheter Kit,Urethral Catheter Kit,Hemodialysis Catheter Kit,Disposable Urethral Catheter Kit Henan Anbang Medical Supplies Co., Ltd. , https://www.anbangmedical.com