Wheat scab has an outbreak, and prevention and treatment need to pay attention to these

Recently, the Ministry of Agriculture announced that it is expected that the wheat scab in 2017 will continue to be in a pandemic situation in the Yangtze River Basin, Jianghuai and Huanghuai wheat areas, and it is necessary to implement a prevention and control area of ​​nearly 200 million mu! Therefore, this year, wheat is grown. Farmers' friends should focus on the prevention and control of the damage caused by scab! The following misunderstandings must not be ignored!

1 Fortunately for the occurrence of scab, relying on old experience to solve new problems

Wheat scab is a typical climatic disease caused by several species of Fusarium. Its epidemic is affected by various factors such as bacterial source, variety resistance, agro-ecological environment and cultivation management measures. In the prevention and treatment of diseases, we must look at it three times. "Look at the sky, see the seedlings, and see the land." We must comprehensively consider the factors of the disease. Some farmers cannot comprehensively consider the above factors, and fail to fully understand the symptoms, epidemics, and pathogenic factors of scab. Only referring to the old experience focusing on weather changes (rainwater and temperature), while ignoring the influencing factors of field humidity and variety differences, although there is no widespread disease occurrence, it also causes disease occurrence, affecting wheat yield and quality. improve.

2 Re-treatment and light prevention, see medicine, miss the best prevention period

Wheat scab can be prevented from being incurable. It should be prevention-oriented, and the traditional practice of active defense and re-treatment of light and light prevention is not conducive to the prevention and control of scab. At the same time, the choice of the period of use in the disease prevention process will directly affect the level of control. Numerous data on the period of application of scab are “heading period to flowering stage”. During such a long period of drug use, there is a big difference in the effect of drug use in different time periods. Some farmers choose to use medicine at the booting stage or at the end of the flowering stage. Some even see the pink mold layer and then use the medicine. They do not have a good grasp of the best prevention period, and the control effect is low. Through field investigations, it was found that the best control period was from 5% wheat to 5%. At the same time, there are several situations to be fully considered. The heading period is fine and the temperature is high. The wheat is plucked and the flowers are raised at the heading stage. The heading period can be used. The temperature at the heading stage is low, the sunshine is small, and the wheat is first taken after the heading, and the medicine should be used at the beginning flowering stage. When the heading period meets the rainy weather, when the scab is probable, the spray should not be late, don't wait until the weather is fine or when the flower is sprayed, the spray should be sprayed several times; if the system is good The period of long-lasting drug control can be advanced to the early stage of wheat heading.

3 Blindly selecting agents, ignoring the problem of complementary drug resistance and mechanism of action

Currently, there are 248 pharmacies registered in the Ministry of Agriculture for the control of wheat and wheat scab (as of March 2013). Among them, carbendazim (97 registration certificates), thiophanate-methyl (50 registration certificates), poly-ketones (35 registration certificates), and Fumeishuang (21 registration certificates) were registered. 81.85% of the total number of registration certificates In recent years, farmers have generally reported that carbendazim is not working, and the effects of other pharmaceuticals are not good. It is impossible to rule out the problem of the quality of some pharmaceuticals. The relationship between resistant strains should also be considered, and farmers should also be considered. There is a close relationship between the use of drugs with different mechanisms of action in the process of drug administration.

The spraying of benzimidazole fungicides such as carbendazim is one of the key measures for the prevention and control of wheat scab in China since the mid-1970s. It is recommended to pay close attention to new varieties, such as tebuconazole, prochloraz (mixed mil), and cymene (Jing). At the same time, it is necessary to pay attention to the correct mixing of different mechanisms of action, to ensure that the drugs used have the multiple effects of systemic treatment, protection and eradication, and comprehensively prevent the spread of disease.

4 acres of water consumption is less, which is not conducive to drug efficacy

According to the interview, some farmers in the wheat area use the conventional sprayer to spray more than 15 liters of water per mu, and the lesser is only 10 liters. Such a small amount of water will affect the normal function of the drug. In order to ensure the efficacy of the drug, if the use of conventional sprayer, the amount of water should be between 45 and 60 liters, or add a potency guarantee agent, such as spread.

5 can not correctly grasp the number of medications

There is no fixed standard for the number of medications. It is necessary to comprehensively consider factors such as the amount of bacteria, the incidence of the disease, and the effects of chemical control. It is necessary to carry out two prevention and control measures for the plots that have been seriously affected in previous years, and pay attention to the post-rain spray, for the first dose effect. If you are not good, you should take remedial measures in a timely manner. You can use the second agent about 7 days after the first dose to better control the spread of the bacteria and reduce the loss.

A comprehensive understanding of the pathogenesis of scab, master the law of onset, grasp the best prevention period, choose the right preventive agent and apply it correctly, and minimize the disease loss.

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The examination  iterm	AR HG/T3474-2000	Factory standard	Factory standard	Factory standard
(Appearance)	Yellow brown	Yellow sand	Yellow hemisphere
(FeCl3.6H2O)	≥99.0%	≥96.0%	≥99.5%	≥99.0%
(Insolubles in water)	≤0.01%	≤0.01%	≤0.01%	≤0.01%
(HCl)	≤0.10%	≤0.10%	≤0.10%	≤0.20%
(SO42-)	≤0.01%	≤0.01%	≤0.01%	≤0.01%
(NO3-)	≤0.01%	≤0.01%	≤0.01%	≤0.01%
(PO43-)	≤0.01%	≤0.01%	≤0.01%	≤0.01%
(Mn)	≤0.02%	≤0.004%	≤0.004%	≤0.02%
(Cu)	≤0.005%	≤0.002%	≤0.002%	≤0.005%
(Fe2+ )	≤0.002%	≤0.002%	≤0.002%	≤0.002%
(Zn)	≤0.003%	≤0.002%	≤0.002%	≤0.005%
(As)	≤0.002%	≤0.005%	≤0.005%	≤0.001%
(Unprecipitate by NH3)	≤0.10%	≤0.10%	≤0.10%	≤0.30%
(Pb)		≤0.001%	≤0.001%	≤0.001%
(Cr)		≤0.004%	≤0.004%
(Al)		≤0.001%	≤0.001%
(Ni)		≤0.002%	≤0.002%
(H2O)		≤3%

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Ferric Chloride Hexahydrate,Iron Ii Chloride Hexahydrate,Ferric Chloride,FeCl3·6H2O,CAS No. 10025-77-1

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