The temperature in summer is higher than that in summer, and the phenomenon of dead seedlings is very easy to appear in celery cultivation, which has a great impact on the growth and yield of celery, and also brings great losses to vegetable farmers. So why is celery dead? How to prevent and control celery dead seedlings? Let's learn about it with Xiaobian.
1、 Causes of celery seedling death
Celery dead seedlings often occur in summer and autumn when there is more rain. In addition, the continuous cropping phenomenon is serious, which leads to a variety of diseases. The diseases of celery dead seedlings include rot, Sclerotinia, black rot, damping off and Damping off. The symptoms of the disease were different, the petiole of soft rot began to appear water soaked spots; the affected parts of Sclerotinia sclerotiorum were brown water soaked and soft rot when the humidity was high; the incidence of black rot was that the diseased part would turn black and rot, and there were many small black spots on it; when the incidence of sudden down disease was serious, it would lead to lodging and could not stand upright; The spot of Rhizoctonia solanacearum developed around the stem, and the root became withered and withered until it died.
2、 Prevention and control methods
1. Reasonable rotation
Rotation can reduce the base number of diseases and insect pests and reduce the incidence of diseases and insect pests.
2. Disinfection of seedbed
The soil must be disinfected by formalin, carbendazim or tobutrazine.
3. Seed treatment
It can effectively control Sclerotinia sclerotiorum by soaking the seeds in salt water before sowing, then washing them with water, and then sowing in the air. Or dressing seeds with mancozeb wettable powder, the dosage of which is 0.3% of the seed weight, can be used to control damping off and Damping off.
4. Seedbed management
When sowing, do not be too dense. After emergence and time of seedlings, the humidity of seedbed is relatively high after rain. Timely drainage should be carried out and grass ash should be sprayed on the seedbed for many times. The diseased plants should be pulled out in time and taken to the plot for burning or deep burial.
5. Field management
In order to avoid burying petioles in soil, timely drainage after rain, and reducing watering times during disease period should be avoided. When the diseased plants were found, they were taken out of the field in time, and then lime was applied to disinfect the diseased acupoints.
6. Medicament propagation
In case of soft rot, chlorobromoisocyanuric acid can be used, once every 7-10 days, continuous spraying 2-3 times. In case of black rot, Sclerotinia sclerotiorum, Rhizoctonia solanacearum and Damping off disease, 50% procymidone 600 times solution, 50% carbendazim 500 times solution can be used, once every 7-10 days, continuous spraying twice.
The above is the celery dead seedling reason and the control method introduction, hoped can help you, wants to know more related knowledge, please pay attention to our knowledge encyclopedia Planting net 。