In the past two years, cucumber target spot disease has been the main disease affecting cucumber production, and it is also one of the biggest "heart troubles" faced by vegetable farmers. For this reason, vegetable growers also spend a lot of money to purchase different medicines, but the actual results are not ideal. Now that we have come to know about target spot disease, we can do symptomatic treatment after careful analysis to achieve the best control effect.
The vegetable farmers all know that the disease "Little Yellow Spot" has little understanding of the name "target spot disease". Why do they call it the "Little Yellow Spot"?
It is because the lesion is a small spot of yellow water stains at the beginning of the disease. It occurs sporadically on the leaves before cloudy days. There are yellow halos around the lesion. When the rain and snow are over, the lesion becomes round or Irregular in shape and uneven, central gray, translucent. The disease began sporadically and spread widely. The whole process took about 10 days and developed rapidly. After the disease occurs, the leaves of the entire plant will be susceptible to disease, and the growth of the plant will become very weak.
Through the above introduction, vegetable farmers should all know that the target spot disease, cucumber winter leaves yellow how to do that the current prevention and treatment of target spot disease is not ideal why it? There are two reasons for this:
1. The bacterial agents such as streptomycin have serious resistance, and copper preparations that have special effects on bacterial diseases cannot be easily mixed. It is precisely because of this that the range of farmer's choice of pharmaceutical agents is greatly reduced.
2. Farmers habitually sprayed fungal agents, but neglected the use of bacterial agents, resulting in pathogenic resistance to fungal agents.
Since there is a full understanding of target spot disease, comprehensive prevention and control should be carried out. The main measures are as follows:
1. Take measures to reduce the humidity in the greenhouse. Target spot disease is prone to spread under conditions of high humidity in the shed, so rain and snow will occur in large areas after a cloudy day. Therefore, we should reduce the humidity through measures such as reasonable ventilation and straw laying.
2, timely removal of diseased leaves, reduce the number of pathogens, and in the usual management pay attention to spray some of the full nutrition of foliar fertilizer, improve plant resistance.
3, to do preventive work ahead of the disease. The usual spraying work can not be relaxed, especially the winter rainy weather is more, in the bad weather before the arrival of spraying some preventive agents, such as chlorothalonil.
4, pharmaceutical control. After the occurrence of the disease, the vegetable farmers can use to the agricultural No. 5 with gold, Amisida, iprodione, difenoconazole with quinoline copper, the effect is better. In order to increase its penetration ability, penetrants such as silicone may also be added to the medicament.
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