Peanut new leaf spot was conquered

Professor Zhai Honghai from Qingdao Agricultural University and his research group have gone through three years of research and continuous experiments and successfully tackled a new leaf spot disease that has been plagued by planting for many years and was called the "peanut killer." Nie Honghai led the task group at home and abroad for the first time to clarify the pathogen of bacterial leaf rot, and established a technical system for the prevention and control of such diseases.

"Killer" eats 500,000 tons of peanuts

“Since the disease was discovered in the United States in the last century, peanut net spot disease has now spread throughout the world. The earliest diseased plant in China was discovered in Shandong and is one of the most important peanut diseases, which has led to a large area of ​​peanut production reduction each year.” Professor Hong Honghai, director of the Department of Plant Pathology at Qingdao Agricultural University, said that since the discovery in 1972, as much as 70% of the disease, the new leaf spot disease represented by net spot disease has become a nightmare for peanut growers worldwide. However, the incidence of black spot disease, brown spot disease, and leaf rot, which are new leaf spot diseases, has remained high for many years. It has been a problem for the industry.

“When peanuts are infected with these diseases, they generally reduce production by about 10% in each year, and the most severe year is a 30% reduction in production.” According to Yan Honghai, the average annual incidence of new leaf spot disease as an “invisible killer” is to be taken from farmers. Take a 15% peanut harvest. According to the data released by the Ministry of Agriculture, from 2006 to 2010 for five consecutive years, peanut planting areas in Shandong Province are all over 11 million mu and the average total output is as high as 3.316 million tons. If this figure is calculated, annual light The new leaf spot disease will have to “eat” nearly 500,000 tons of peanuts in the province.

"God doctor" first leaf rot pathogen

As the most important economic crops and oil crops in China, peanuts have always been the traditional planting varieties of farmers, and Shandong Province, especially the eastern peninsula region, is the main producing area of ​​peanuts in China. How can we get the new leaf spot disease peanut? The killer has become a difficult problem for all plant pathologists.

The “God Doctor” who used to attack a series of diseases such as gentian, corn and other diseases, has launched a new attack on the world’s “peanut killer”, the new leaf spot disease. Isolation and purification of pathogenic bacteria, isolation and determination of secreted toxins, sequencing of genes, etc.. Si Honghai and colleagues, who have spent half a lifetime dealing with various plant diseases, have not remembered how many trials have been conducted on new leaf spot disease. After three years of unremitting efforts, the research group in the world "first" leaf rot pathogens, clear the classification of the pathogen. What delights the peanut growers is that the “God Medical” research group has also studied the prevention and control of new leaf spot diseases. “Using the preparations we developed, the control effect of net spot disease can reach 71.7%. It is as high as 83.1%.” According to Yan Honghai, the light alone can prevent growers from losing billions of yuan each year.

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