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China’s Jiangsu Province: high frequency in epidemic of wheat powdery mildew
Mar. 10, 2017
The survey shows that in recent years, the occurrence of local wheat powdery mildew has showed some characteristics including: high frequency, early beginning occurrence stage in those severe occurrence years as well as heavy damage. Jianhu County, for example, from 2006 to 2015, suffered very severe wheat powdery mildew pandemic for 3 years, which respectively were 2013, 2014 and 2015; serious occurrence for four years, which respectively were 2007, 2008, 2009 and 2012. From 2013 to 2015, those years with the very severe occurrence, the beginning occurrence stage of powdery mildew was significantly earlier than the average year and the loss caused by this disease was still serious after controlling.
According to Jiangsu Province Academy of Agricultural Sciences, the main reasons for the severe outbreak of wheat powdery mildew in recent years are as followed:
1. In recent years, the population density of wheat sowing is high with high humidity and the wheat seedling grows weakly, which is beneficial to the occurrence of powdery mildew.
2. Farmers apply the fertilizer heavily on the wheat at the turning green stage while apply the fertilizer slightly at the ear stage, promoting the growth of wheat seedling after spring, which increases the susceptibility of plants since the tissue is too tender.
3. Autumn and winter’s temperatures are high and warm winters help the germs overwinter and reproduce which is conducive to the spread of powdery mildew infection.
4. Farmers ignore the early prevention of powdery mildew and don’t spray the pesticides on the wheat until late April and early May in order to control the wheat fusarium blight scab together, missing the best time for powdery mildew control.
Therefore, the experts suggest that in the year that suffers early onset and severe occurrence of powdery mildew, it should adhere to the "prevention first" strategy and can also control the powdery mildew in late March and early April when control sheath blight primarily.
In recent years, there are many varieties of agents for the prevention and treatment of wheat powdery mildew mainly including triazole, strobilurins, pyrimidine amines, etc. Triazoles include triadimefon, propiconazole, tebuconazole, and so on. Strobilurins and its mixtures include kresoxim-methyl, triclopyricarb and so on while Pyrimidine amines include ethirimol, etc. Applying pesticides with different mechanism of action in rotation can reduce or delay the emergence of drug-resistant and improve control effect.
Source: Think Real
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