What are the pests and diseases of celery? What are the control methods?
Celery is a vegetable that can rival cilantro in being famously dreaded. It is generally divided into 2 types in our country: Western celery and Chinese celery. Because it has been cultivated for a relatively long time, its distribution is also relatively wide, and its economic benefits have always been good, so many farmers are willing to grow it. However, it also has relatively many pests and diseases, and managing it is relatively complex. Below, let the editor introduce to everyone celery pests and diseases and control methods.
I. Pests and diseases of celery
First type: Leaf spot
The symptoms of leaf spot: this disease mainly harms the leaves of celery. In the early stage, the leaves show yellow-green spots, and as it develops further, round lesions form. The size of the lesions is generally 4-10 mm, and the color of the spots is grayish brown. The edges of the leaves are slightly darker. If it occurs relatively severely, it will expand into patches, and then cause the death of the leaves.
The lesions on the stems and petioles are oval, about 3-7 mm in size, grayish brown in color, and slightly sunken. If the plant is severely affected, it will cause the whole plant to lodge.
Second type: Soft rot
Soft rot generally occurs on the petioles or stems of celery. At first, water-soaked light brown spindle-shaped spots appear, then they become wet rot, and later they turn black and give off a foul odor, remaining on the surface of the celery. This pathogen generally overwinters in the soil and enters through wounds on the celery. If it rains, it will spread with the rainwater or during watering. This disease becomes severe in the later stages of celery growth when humidity is relatively high.
Third type: Root-knot nematode disease
The manifestations of root-knot nematode disease are that the plant stops growing, then the color of the celery is not normal, and there is also relatively high humidity, and then the plant wilts. These symptoms are all caused by nematodes damaging the roots.
II. Control methods for celery pests and diseases
1. Control recommendations for leaf spot
When we choose varieties, we should choose some disease-tolerant varieties as much as possible. When collecting seeds, seeds need to be collected from plants without disease. Before sowing, the seeds need to be soaked in water at a temperature of 48°C for 30 seconds; there should also be crop rotation of more than two years; there should also be reasonable close planting, and then scientific irrigation, which can prevent the temperature from being too high; at the very beginning of the disease, 50% carbendazim wettable powder can be used for spraying.
2. Control recommendations for soft rot
Crop rotation of more than two years is needed. When loosening the soil and setting the seedlings, try to avoid damaging the roots; then the soil should not be hilled too high, and the petioles should not be buried in the soil; after rain, drainage should be carried out in a timely manner; also, if diseased plants are found, they need to be pulled out in a timely manner, and then lime should be used for disinfection.
During the period of disease occurrence, water as little as possible or temporarily stop watering. In the early stage of the disease, 72% agricultural streptomycin sulfate wettable powder can be used for spraying. Generally, spray once every 7-10 days, and it can be sprayed continuously 2-3 times.
3. Control recommendations for root-knot nematode disease
Reasonable crop rotation is needed, and disease-free soil should be used for raising seedlings; most root-knot nematodes are partly within 3-9 cm of the soil surface. If deep plowing is done, their damage can be reduced.
When sowing or planting, 10% Limanku granules should be applied at 75kg/hm2; if this disease occurs during the growth period, management should be strengthened. We need to thoroughly clean up the diseased residues, then burn them in a centralized manner, and also carry out reasonable irrigation and fertilization to enhance disease resistance.
Alright, the above is the celery pests and diseases and control methods brought to you by the Tuliu.com editor. We hope it can be helpful to everyone.