Before or during the arrival of high and low temperatures, the prevention of brown spot disease requires less or base fertilization, maintain a certain amount of phosphorus and potassium fertilizers, prevent intercropping and seepage irrigation, and especially prevent evening water injection. Do everyone know what medicine is effective for treating brown spot disease? Let’s find out together.

1. Enhance quarantine certificates to prevent the introduction and adjustment of disease seeds.

2. Irrigation in shallow water areas, avoid the flow of field water. Use secret formula fertilization, avoid excessive base fertilization. Immediately remove wild grass at the edge of the field and deal with a large amount of wheat straw.

3. Drug prevention refers to rice leaf blight.

4. Agricultural and pastoral disease prevention: Use disease-resistant varieties, pay attention to the removal of wild grass at the edge of the field, strictly prohibit the water flow of the diseased field, stipulate shallow water irrigation, and effectively fertilize.

5. Disease prevention with drugs: Before or after the arrival of strong typhoons and heavy rain, immediately spray the diseased fields or susceptible crops with a comprehensive spray once, especially in gardens that have been waterlogged by floods. The frequency of administration depends on the development of the disease and climatic conditions, generally spraying once every 7-10 days, twice for early outbreaks, and once for late outbreaks. For every 667 square meters, use 100 grams of 0% wettable powder of double leaf condition, 100-150 grams of 70% leaf desiccant (also known as desiccant), or 100 grams of 25% wettable powder of leaf desiccant, or 100 grams of 10% chloramphenicol wettable powder, or 100 grams of 50% thiram, or 40 grams of 25% sterilizing agent wettable powder, or 200 grams of 15% sterilizing agent, all dissolved in a sprayer containing 50 liters of water.

Ball cabbage brown spot disease is a bacterial disease that affects the leaves of ball cabbage. It often causes a reduction in the yield of ball cabbage by 10% to 20%, with a decrease in sugar content of 1° to 2° or 2° to 3°. The leaves show deep brown to purple-brown annular or irregular small black spots at the initial stage of the disease, which eventually cause the leaves to turn brown and die. The injured bacteria are Cercospora aegopodii, which belongs to the Deuteromycotina. This disease can be prevented by cultivation techniques or spraying with pesticides.

Disease and pest symptoms

The ball cabbage is often limited to produce 10% to 20% less, with a decrease in sugar content of 1° to 2°, and a reduction of 2° to 3° in the Huanghuai Plain and the upper and middle reaches of major rivers. Both raw ball cabbage and seed ball cabbage can be affected by the disease. The leaves show deep brown to purple-brown annular or irregular small black spots at the initial stage of the disease, which gradually expand to 3-4mm. The black spots are surrounded by a dark brown to reddish-brown edge produced by anthocyanins, and the center of the disease spot is thin and prone to cracking. The disease spots on the leaves exceed the leaf back, and the number of spots on each leaf can reach hundreds. In the middle and later stages, grayish mold-like substances are formed in the center of the diseased area, which are the conidiophores and conidia of the pathogen, causing the spots to combine and turn brown and die. The outer leaves of the plant are affected first, gradually spreading to the middle and upper leaves, causing continuous damage to the new buds, leading to thickened root crown and the emergence of green heads. The leaf stem shows elongated yellow-brown spots.