Latest Roundup of Common Carrot Pests and Diseases and Their Control Methods
Carrot is a vegetable we commonly eat. Its carotene and vitamin content is very high. If we eat it raw, we can take in more vitamins, but many people are not used to eating it that way. At present, China's carrot planting area is very large. Because it itself has extremely strong adaptability, it can be planted almost anywhere. In addition, it has extremely strong resistance and rarely develops diseases. However, today Qinnong.com 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
Because carrots are mainly grown for their roots, many diseases mostly occur on the roots, and black spot is the same. It mainly harms the roots of carrots, but the leaves and stems are also affected to a certain extent. Black rot is mainly caused by relatively heavy rainfall, with a lot of rain in the field, and then the water is not drained from the field in time. Then, after the rain, high temperatures cause pathogens to invade. The carrot becomes infected. The symptoms are that small black spots gradually appear on the carrot root and gradually spread and deepen, which also causes black spots to appear on the leaves of the plant. 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, the field can be treated with quicklime. Finally, in the early stage of the disease, a chlorothalonil solution can be sprayed for control.
2. Black rot
Black rot is also what we call soft rot. The causes of black rot are similar to those of black spot, both including factors such as improper field management, but black rot is mainly caused by weather conditions. Generally, after a long period without rain, torrential rain suddenly falls, making the soil unable to adjust, producing pathogens, and then infecting carrots. The plant slowly turns black and rots. The control methods are seed treatment at sowing time; next, maintaining field moisture during drought so that the soil has sufficient adaptability; in addition, draining water in time when torrential rain occurs; and finally, chemical control, for which agricultural streptomycin sulfate soluble powder at 4000 times dilution, or Fengling at 200 times dilution, can be used, sprayed about once a week, twice in total.
3. Sclerotinia rot
The main cause of sclerotinia rot is excessively high humidity in the soil and air, plus many cloudy and rainy days, so the plant absorbs too much water. As a result, brown spots gradually appear on the stems, leaves, and roots of the plant. Finally, the plant slowly softens and white substances appear, or white or gray mold appears. In fact, it is roughly similar to rot. The control methods are generally digging ditches in the field for drainage, reducing humidity, and then enhancing field ventilation. Finally, metalaxyl-hymexazol at 2000 times dilution or iprodione wettable powder at 1500 times dilution is sprayed for control.
4. Aphids
Aphids are a common pest in 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 spraying 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 fruits. They slowly gnaw at carrot fruits, taking a bite from each one, and then when you harvest, there are wormholes everywhere, which looks very unsightly. The control methods are spreading a layer of insecticide in the soil; next, using 50% phoxim at 2500-3000 times dilution or Lorsban at 2000 times dilution for control, with very good results; of course, trichlorfon can also be used for control.