What medicine is used for celery leaf spot disease, and what method is used to treat celery leaf rol

Bacterial leaf spot is an important disease of celery cultivated in protected areas, with a general incidence rate of 5% to 20%, and more than 80% of the diseased plants when it occurs severely, which has a serious impact on yield and quality.

Bacterial leaf spot disease mainly affects leaves, and can occur from seedling stage to harvest stage. At the beginning of the disease, light brown and water-stained irregular spots are produced on the leaves, which gradually develop into polygonal shapes due to the restriction of leaf veins when expanding, and in severe cases, several lesions on the leaves are connected and fused into large lesions. Sometimes the lesions develop along the leaf veins, the leaf veins turn brown and twist and deform, and the later lesions gradually turn brown and the leaves die.

Prevention method: Ecological control method should be used for celery cultivated in greenhouses, and timely ventilation and dampness should be released to reduce foliar condensation. Before the onset of the disease or when there is a single diseased strain, the commonly used agents are gentamicin 2000 times, or haloperic acid 600 times, or noromycin 2000 times, or 56% of the mountain water dispersed microparticle 600 800 times, or 77% can kill wettable powder 500 times, or 30% copper hydroxide suspension 800 times of liquid respectively, respectively, mixed with 600 times of Tianda 2116 + 3000 times silicone + 1% fermented milk alternate spray, every 7 10 days 1 time, continuous spraying 2 3 times.

<> celery leaf curls are generally caused by viral diseases, cultivation management should be strengthened, the temperature of the seedbed should be reduced during the seedling period, the light duration should be reduced, the irrigation should be reasonable, the diseased seedlings should be removed, and the strong seedlings should be cultivated. Do a good job in drought and flood prevention, and water and fertilize in a timely manner; At the same time, spray with 50% aphid mist wettable powder (2000-3000 times liquid) or 40% dimethoate emulsifiable concentrate (1000 times liquid, % malathion (1000 times liquid).

<> celery leaf curls are generally caused by viral diseases, cultivation management should be strengthened, the temperature of the seedbed should be reduced during the seedling period, the light duration should be reduced, the irrigation should be reasonable, the diseased seedlings should be removed, and the strong seedlings should be cultivated. Do a good job in drought and flood prevention, and water and fertilize in a timely manner; At the same time, spray with 50% aphid mist wettable powder (2000-3000 times liquid) or 40% dimethoate emulsifiable concentrate (1000 times liquid, % malathion (1000 times liquid).

<> celery leaf curls are generally caused by viral diseases, cultivation management should be strengthened, the temperature of the seedbed should be reduced during the seedling period, the duration of the light should be reduced, the reasonable irrigation should be pure, the diseased seedlings should be eliminated, and the strong seedlings should be cultivated. Do a good job in drought prevention and flood prevention, and water and fertilize in a timely manner; At the same time, spray the cherry fog with 50 aphid mist wettable powder (2000-3000 times liquid) or 40 dimethoate emulsifiable concentrate (1000 times liquid) malathion (1000 times liquid).

Celery with green veins and yellow leaves.

Symptoms Celery green veins and yellow leaves occur from time to time, and the growth is obviously weakened after the occurrence and the yield is reduced. Celery plants are dwarf and grow slowly. It starts with the young leaves at the top of the plant and gradually develops to the lower leaves, and the veins of the diseased leaves remain green.

The mesophyll fades green and turns yellow-green to yellowish-white. The whole leaf presents obvious green veins and yellow leaves.

** Celery green veins and yellow leaves are caused by iron deficiency in the plant. Iron is deficient because it is closely related to the formation of chlorophyll.

The leaves lose their green and yellow, or even turn white. Iron does not move easily in the plant, so iron deficiency is first found in the young leaves at the tip of the plant.

on. In general, soils contain large amounts of iron, which exist in a bivalent or trivalent state. What plants can absorb is ferrivalent.

Child. The content of ferric iron available to plants in soil is related to soil pH and soil calcium carbonate content. If the soil is alkaline and the calcium carbonate content is high, the availability of iron will be reduced and iron deficiency will be manifested. In addition, excessive soil water saturation can also reduce iron.

of giveability. Temperature, humidity, light and other conditions also have an impact on the plant's ability to absorb iron.

Prevention and control methods Alkaline or alkaline soil should be improved to achieve neutral or slightly acidic. Increase the application of organic fertilizer and improve.

Soil organic matter content. Soil organic matter had a significant role in promoting the activation of iron, and the content of available iron in soil with high organic matter was high.

The amount is also high. Nitrogen, phosphorus and potassium fertilizers should be applied reasonably, and phosphate fertilizers should not be excessive, and excess phosphoric acid is easy to cause iron deficiency. Reasonable irrigation, do not make the soil too wet, too dry, and discharge the water in the field in time after rain. Celery cultivation in protected areas, winter and spring to do a good job of warming, heat preservation,

Fill in the light work. When the green veins and yellow leaves of celery are found, the foliar fertilizer spray, ferrous sulfate solution, or ferric chloride solution can be sprayed in time.