In general, the yellowing and shrinking of the heart during the seedling stage can hinder proper balling. During the adult stage, the affected leaves become brittle, curled, and the central part of the plant fails to develop properly. Gray-brown spots appear on the leaves, which negatively affects both yield and marketability. High temperatures and drought, particularly under high night temperature conditions, create a favorable environment for disease development. These are key external factors that contribute to infection. To prevent this disease, the following measures should be taken:
Regular watering is essential, especially during the early growth stages. It's important to avoid overwatering or under-watering. Follow the principle of "three-water seedlings and five-water seedlings," which means watering every two to three days. The best time to water is in the evening, as it helps reduce evaporation and ensures better absorption.
Fertilization should focus on enhancing both nitrogen and potassium levels to promote strong, healthy seedlings. A single application of base fertilizer is sufficient. For each mu (a traditional Chinese unit of area), applying 5 kg of bio-potash fertilizer, 50 kg of potassium sulfate compound fertilizer, and 15 to 20 kg of ammonium bicarbonate is recommended.
Timely control of pests such as aphids is crucial to eliminate the source of infection. As soon as pests are detected, they should be sprayed immediately. Adding 0.3% potassium dihydrogen phosphate during spraying not only improves the effectiveness of the treatment but also enhances the plant’s resistance to disease.
If any diseased plants are found, they should be removed immediately to prevent the spread of infection. Apply a solution of A500 diluted or plant disease spirit at a ratio of 500 to 800 times for prevention and treatment. Regular monitoring and quick action are essential to maintain plant health and ensure a successful harvest.
Swimming Crab,Frozen Blue Swimming Crab,Frozen Cut Swimming Crab,Box Frozen Swimming Crab
Zhoushan Haiwang Seafood Co., Ltd. , https://www.haiwangseafoods.com