What are the common pest and disease control methods for carrots?

The carrot is a vegetable we commonly eat, and it contains a very large amount of carotene and vitamins. If we eat it raw, we can take in even more vitamins, but many people are not used to eating it that way. At present, the carrot planting area in our country is very large. Because it has extremely strong adaptability, it can be planted almost anywhere, and since it also has very strong resistance, it rarely develops diseases. However, today Qinnong Web brings you some of its common pests and diseases as well as control methods, and we hope they will be useful to everyone.

1. Black spot disease

Since carrots are mainly grown for their roots, many diseases mostly occur on the roots, and black spot disease is the same. It mainly damages the roots of carrots, but the leaves and stems are also affected to some extent. Black rot is mainly caused by relatively heavy rainfall, with a lot of rainwater in the field that is not drained away in time, followed by high temperatures after the rain, which allows pathogens to invade. Once carrots are infected, the symptoms are that small black spots gradually appear on the carrot roots and gradually spread and deepen, which also causes black spots to appear on the leaves of the plants, and in severe cases the entire plant turns black and dies. We can disinfect the seeds before sowing, which can enhance their immunity. Next, before sowing, we can disinfect the field and can use quicklime. Finally, in the early stage of the disease, we can apply a chlorothalonil solution by spraying for control.

2. Black rot

Black rot is what we call soft rot. The causes of black rot are similar to those of black spot disease, both including factors such as improper field management, but black rot is mainly caused by weather conditions. Generally, it is when it has not rained for a long time and then suddenly there is a rainstorm, causing the soil to become unable to regulate properly, producing pathogens, which then infect the carrots, and the plants slowly turn black and rot. The control methods are to treat the seeds when sowing. Next, during drought, the field moisture should also be maintained so that the soil has sufficient adaptability. Also, when there is a rainstorm, the water needs to be drained in time. Finally, chemical control can be carried out by using agricultural streptomycin sulfate soluble powder at 4000 times dilution, or Fengling at 200 times dilution, spraying once about every week, twice in total.

3. Sclerotinia rot

The main cause of sclerotinia rot is excessive humidity in the soil and air, plus many cloudy and rainy days, so the plants absorb too much water, causing brown spots to gradually appear on the stems, leaves, and roots of the plants. In the end, the plants slowly soften and white substances appear, or white or gray mold appears. In fact, it is almost the same as rot. The control methods are generally to dig trenches in the field for drainage, reduce humidity, and then enhance ventilation in the field. Finally, spray metalaxyl-hymexazol at 2000 times dilution or iprodione wettable powder at 1500 times dilution for control.

4. Aphids

Aphids are a pest that commonly appears on many vegetables. They mainly harm the leaves and stems of vegetables. Although the edible part of carrots is the root, if the leaves and stems are damaged, carrots cannot carry out photosynthesis, the roots cannot grow large, and thus yield and quality are reduced. Therefore, the most commonly used control method for aphids is to spray 10% imidacloprid at 1500 times dilution, twice to three times.

5. White grubs

White grubs are a pest that lives underground. They mainly survive by eating plant roots, so they have a great impact on carrot roots. They will slowly gnaw on the carrot roots, nibbling one after another, and when you harvest, there are wormholes everywhere, which looks very ugly. The control methods are to spread a layer of insecticide in the soil, and next to use 50% phoxim at 2500-3000 times dilution or Lorsban at 2000 times dilution for control, and the effect is very good. Of course, trichlorfon can also be used for control.