2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Carrot cercosporosis is an extremely unpleasant attack, accompanied by the appearance on carrot leaves of light brown spots with light central parts. It is possible to encounter cercosporosis quite often, but it is widespread almost everywhere. This disease is especially harmful in highly humid areas and in floodplain fields. It most often develops during rainy years. If the defeat is too strong, the leaves will begin to die off prematurely, and the roots will shrink
A few words about the disease
As a rule, the first signs of this destructive ailment are found closer to the middle of summer. At the very beginning of the development of cercospora on the leaves of carrots, unpleasant rounded specks of light brown color are formed, endowed with light centers. As the disease develops, the specks lighten and grow, and the edges of the leaf blades twist.
With high humidity, the specks are covered from below with a thick grayish bloom - this is how conidial sporulation looks like. On stalks with petioles, the spots are usually oblong and slightly depressed. Gradually, they all merge with each other, after which they turn black and begin to slowly rot.
If cercospora has infected the green parts of the plants, the roots will form shrunken and small. This is a consequence of the death of the leaves.
The causative agent of carrot cercosporosis is the pathogenic fungus Cercospora carotae, which overwinters among the remains of plants. Slightly less often, the fungus can persist on the seeds.
How to fight
The main preventive measures against carrot cercosporosis are the observance of crop rotation, deep digging of the soil, as well as the cultivation of resistant hybrids and varieties. And since the main wintering place of the causative agent of the disease is the remains of plants, they must be promptly eliminated from the sites.
Ideally, it is best to equip carrot beds in well-drained areas with permeable and fairly loose soil. Before sowing, carrot seeds are recommended to be warmed up in water at a temperature of up to fifty degrees. Then they are cooled, treated for fifteen to twenty minutes with a 1% solution of potassium permanganate, and then with any biostimulant.
When growing carrots, it is important to try to avoid thickening of the plantings - they must be systematically thinned out. And too acidic soils need to be limed - carrots develop very poorly on acidic soils. Also, the soil must be maintained in a moderately moist state, periodically feeding the carrots with phosphorus-potassium fertilizers.
Water the carrots with water heated in the sun. It will be useful to use during irrigation and solutions of various natural biostimulants (mullein, nettle, etc.). And spraying and watering with Baikal-M and Immunocytofit solutions will help to increase the resistance of carrot plantings to all kinds of ailments and significantly strengthen them.
Carrot shoots attacked by the disease are sprayed with a 1% solution of Bordeaux mixture. Also, fungicides such as Bravo and Quadris have proven themselves well in the fight against cercospora. You can also use such biological products as "Fitosporin-M", "Gamair", "Trichodermin" and "Glyocladin" - they are equally well suited for combating cercosporosis and for its prevention.
After the carrot crop is harvested, the soil must be treated with a solution of copper sulfate (for ten liters of water - 50 g) or with a drug called "Barrier" (for each liter of water they take three caps of the product), spending for every five square meters on liter of solution.
Rooms intended for storing carrots are recommended to be processed annually with sulfur bricks and lime. And if the carrot is planned to be stored in the sand, it should be replaced every season.
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