What is the white spot of the sunflower and what is the treatment?

Sick. Loose-tailed sunflower likes warm and humid, semi-shady and well-ventilated environment, not cold-tolerant, more shade-tolerant, sensitive to the scorching sun, suitable for growing in loose, well-drained, humus-rich soil, the minimum temperature of wintering should be above 10. Potted sunflower can be prepared as culture soil with humus, peat soil plus 1 3 river sand and part of the base fertilizer.

Its tiller buds grow more closely on the rhizome, and when potted, it is slightly deeper than the original planting, so that the new shoots do not take root better. 5 October is the period of vigorous growth, and relatively sufficient water and fertilizer conditions must be provided. Keep the potting soil moist at all times.

During the high temperature period in summer and autumn, it is necessary to keep the air humidity around the plant high, but avoid water accumulation in the potting soil, so as not to cause root rot. Generally, every 1 2 weeks to apply a rotting liquid fertilizer or compound fertilizer, to promote the vigorous growth of plants, the leaf color is dark green, autumn and winter can be less or no fertilizer, while keeping the potting soil dry and wet. Loose tail sunflower likes warm, winter needs to do a good job of heat preservation and anti-freeze work, generally about 10 can be relatively safe to overwinter, if the temperature is too low, the leaves will be yellow, the tips of the leaves will be dry, and lead to root damage, affecting the growth of the next year.

It likes semi-shade, and should be shaded by 50% in spring, summer and autumn. Indoor cultivation and ornamentation should be placed in a place with strong scattered light; It can also tolerate darker environments, but it should be regularly moved to a well-lit place outdoors for maintenance to facilitate recovery and maintain a high viewing state. If the environment is dry and poorly ventilated, red spiders and scale insects are prone to occur, so it should be sprayed regularly with 800 times dimethoate.

Loose tail sunflower white spots, need to spray it with fungicides, but also need to cut off the leaves of the loose tail sunflower with serious disease to avoid further deterioration of the situation, when maintaining the loose tail sunflower, it needs to be moved to a ventilated environment, but also need to control the frequency of watering, you can wait until the soil is completely dry before watering, to maintain the normal growth of the loose tail sunflower.

1. Spray the agent

White spots on the sunflower may be a scale insect on the leaves of the plant, which needs to be manually dewormed immediately, you can use a soft brush dipped in alcohol to wipe the leaves repeatedly to wipe off the pests on the sunflower, and you also need to spray a sterilization agent every other week to remove the pests on the sunflower and make it grow healthily.

2. Prune branches and leaves

When cultivating sunflower, if you find white spots on the leaves of the plant, you need to use sharp scissors to cut off the leaves of the sunflower that is seriously infected, so as not to cause large-scale infection, and you also need to apply diluted disinfectant or plant ash at the fracture of the sunflower to disinfect and sterilize it to avoid the wound rot of the sunflower.

3. Suitable environment

Loose-tailed sunflower is suitable for growing in a ventilated and breathable environment, when breeding loose-tailed sunflower, if the environment is too closed, it will lead to a large number of bacteria in the air, so that the probability of being infected with the disease of loose-tailed sunflower increases, and it is necessary to open the window every morning and evening to make the indoor air circulate and provide a suitable environment for the growth of free-tailed sunflower.

4. Control watering

Sunflower is not tolerant to waterlogging, when breeding sunflower, if watering too frequently, it will cause the plant to rot in water, so that the leaves of sunflower are wilted and yellow, you need to control the frequency of watering, you can water according to the dryness and wetness of the soil, and you also need to move the sunflower to a dry and breathable place for drying when watering too much.

If the environment is dry and poorly ventilated, it is easy to redden.

Spider. and scale insects, so it should be sprayed regularly with 800 times oxidized dimethoate.

Prevention and control of sunflower leaf blight.

Leaf blight is a common disease caused by fungal infestation, which has a great impact on the growth of sunflower, which can dry up the leaves and cause the death of the whole plant. The symptoms, patterns and prevention methods are introduced as follows

1. SymptomsThe pathogen first infects the leaf tip and leaf margin, and the infected place is brown spots or strip-like plaques in the early stage, and the spots or plaques in the middle stage gradually expand and connect with each other, and the leaves appear gray-white and dry in the later stage.

Second, the pathogenesis of the pathogenic bacteria overwintering on the diseased plants or in the soil, and the conidia are transmitted by wind, rain, spray and watering, and the pathogens invade from the wounds of the plants. High temperatures, high humidity and unventilated environments are susceptible to this disease.

3. Prevention and control methods: strengthen disease inspection, and do not introduce diseased plants; Strengthen ventilation and avoid rain and spray during the onset period; Cut off the affected branches and leaves in time to prevent further impregnation, and apply the wound after pruning"Dakoning"ointment is treated; If there is a disease, it can be sprayed with 70 methyl tobuzine 800 solution or 75 chlorothalonil 1000 times, sprayed once every 7 to 10 days, and sprayed 3 to 4 times in a row, which can effectively control the disease.

Cultivation of sunflower.

Hello: After the leaves of the sunflower grow black spots, you need to quickly cut off the diseased leaves, and burn them together, and you should also cooperate with the drug **, and spray dimethoate regularly. In addition, it is necessary to isolate the diseased plants from the healthy plants, maintain good ventilation during the maintenance period, and not let it grow in an environment where the temperature is too high and not ventilated, otherwise this situation will occur.