Citrus anthracnose can invade branches, leaves and fruits, causing falling off, which has severe impact on yield. Citrus anthracnose usually occurs to weak citrus trees. Eventually, it brings serious decline in yield.
Most of the acute infections of citrus anthracnose starts from tip of leaves. At the beginning, infection spots show pale blue to dark brown water stains. expanding rapidly. When it is getting wet, red sticky punctate appear in the infection spots of citrus anthracnose show and damaged leaves falling off quickly.
Chronic infection of citrus anthracnose usually starts from margin or tip of leaves, and infection spots are semi-circular or irregular, with a taupe in the middle and a brown or dark brown edge. When it is dry, the infection spots are grayish white with small brown punctate.
When citrus anthracnose occurs at citrus shoots, it brings infection spots with light brown water stains. Infection spots appears around branches in a circle, it causes leaves falling and shoots getting wilt. Wilt shoots are grayish or taupe, and black punctate are sometimes found on infected branches.
When citrus anthracnose occurs at citrus flowers, flowers stigmas turns brown, rot and falling off. In addition, young fruits of citrus are damaged, with dark-green oil stains appearing, shrinking into a stiff, and falling off. Other citrus fruits hanging on trees are damaged during expanding stage, and there are dry plaques in teardrops or round, which lead to fruit drop. Once the fruit stalks are damaged, the rot will cause a large amount of fruits falling off.
Citrus anthracnose occurs at citrus flowers
Prevention and control of citrus anthracnose
1. Improve cultivation management to strengthen citrus trees.
Promote management of fertilizer and water and pay attention to drainage. In addition, appropriately increase the application of organic and potassium fertilizers to improve soil, which protects the citrus roots. Meanwhile, properly pruning, improve lighting conditions to prevent pests, frost damage and mechanical damages.
2. Apply fungicide timely. It is recommended to apply citrus fungicide ‘Qingcui’ to the young shoots and young fruit, when it is high temperature, high humidity or continuous hardly foggy.
Features of ‘Qingcui’
1. Wide-spectrum, safe for crops, and easy to use.
2. ‘Qingcui’ induces the production of phytoalexin in plants to delay leaves senescence. It can also promote fruit coloring and enhance photosynthesis. Eventually, it improves fruit quality.
3. ‘Qingcui’ inhibits cell membrane formation while inhibiting cellular respiration, which provides dual mode of actions, resistance of pathogens.
4. ‘Qingcui’ has excellent conductivity and permeability. It provides both preventive and therapeutic activities, which is safe and environmentally friendly.
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