Due to the occurrence of diseases caused by temperature and continuous rainfall, how to control the spread of vine blight and virus diseases in farmland

Recently, the temperature is getting higher and higher, coupled with continuous rainfall, and the weather is unstable. The agricultural improvement farm in Hualien County has found that "vine blight" and "virus disease" have gradually spread in Longxu vegetable fields in Ji'an District, Hualien County. It is suggested that farmers should take prevention and control measures as soon as possible so as not to affect the follow-up yield.

According to the statistics of the Council of Agriculture, in 106, the planting area of asparagus reached 361.27 hectares, of which 184.27 hectares were planted in Hualien County, and the producing areas were concentrated in Ji'an Township.

How to prevent vine blight? Hualien Farm recommends this.

If asparagus is infected by vine blight, it may even lead to plant wilt and death. Generally, vine blight begins to occur from mid-late April to early May, especially in continuous cropping fields, where planting is too dense, poor ventilation, excessive nitrogen fertilizer and so on. The disease is more serious. Vine blight can be spread by airflow, wind and rain splash or irrigation water, and the pathogen can remain in the remains of diseased plants and soil, becoming a source of persistent infection.

Hualien Farm suggests that vine blight can be spread by seedlings, and that the use of healthy melons is the primary task to reduce the disease. Farmers should pull out diseased plants and do not abandon them in the field. Continuous cropping of the same crop will lead to the gradual accumulation of pathogenic bacteria. Farmers can take 3-5 years of rotation with different crops or fallow, especially with paddy fields to reduce the incidence of diseases.

As for whether to use chemical control? Tsai Yizhen, an assistant researcher at Hualien Farm, said that because the plants are stronger, local farmers are less likely to spray fungicides. If you need to apply pesticides, you can check with the plant protection information system, and you should be careful not to cause injuries and excessive pesticide residues.

Hualien Farm also suggests that after rain, it is easy for snails to hide and eat bergamot plants, and the wounds caused may also increase the number of diseases. It is suggested that farmers should timely apply medicine or materials to control snails; do not apply too much nitrogen fertilizer so as not to aggravate the disease; organic farmers can use microbial agents and phosphorous acid and other non-pesticide materials for control to reduce the problem of diseases and insect pests.

There is no recommended drug for viral disease. It is suggested that the diseased strain should be removed.

As for the virus disease, which causes uneven yellow-green leaves and leaf curls, which affects the yield of young shoots, Tsai Yizhen points out that at present, there is no recommended drug to prevent and cure the virus disease, and farmers are advised to pull out the diseased plants as far as possible to avoid leaving the source of infection in the field. Virus disease can be transmitted through silver leaf whitefly. Farmers can apply pesticides to control whitefly and do a good job in field management to reduce the incidence of disease in the field. If farmers have questions about the prevention and control of asparagus vine blight and virus disease, you can contact Hualien District Agricultural improvement Farm or make good use of online diagnosis.