What are the control methods for mango shoot blight and gummosis?
What is mango shoot blight and gummosis? What methods can effectively control it? Mango shoot blight and gummosis mainly damages shoots and the main trunk, causing dieback, but it can also harm seedlings and fruit. When seedlings are affected, dark brown necrotic spots usually appear from the bud union or wounds, rapidly spreading upward and downward, causing the scion to die. ...
What is mango shoot blight and gummosis? What methods can effectively control it?
Mango shoot blight and gummosis mainly damages shoots and the main trunk, causing dieback, but it can also harm seedlings and fruit. When seedlings are affected, dark brown necrotic spots usually appear from the bud union or wounds, rapidly spreading upward and downward, causing the scion to die. When the main trunk or shoots are affected, the cortex necroses and shows canker symptoms, and gum that is initially white and later brown exudes from the diseased part. Shoots above the diseased part wither, with small black dots forming on them. Leaves on dead branches turn brown, curl upward, and fall easily. Fruit also shrivels, but generally does not drop. New shoots sometimes emerge below the diseased part, but they grow poorly and their leaves are discolored.
When flower stalks are affected, longitudinal cracks form. When the lesions spread to young fruit, they can cause the young fruit to drop. When mature fruit is affected, symptoms appear during the softening and ripening stage. Initially, a water-soaked soft spot appears at the fruit stalk, then expands into a large grayish-brown spot and exudes sticky juice, and the inner fruit becomes brown and soft-rotted.
Control methods: 1. During cultivation, prevent mechanical injury and damage from longhorn beetles. 2. Take budwood from healthy, vigorous mother trees. The grafting knife should be sterilized with 75% alcohol. Budded seedlings should be planted in a dry place with good air circulation, especially keeping the graft union area dry. After the buds have taken and the ties are removed, ensure good ventilation. 3. In combination with shaping and pruning, cut off diseased shoots. When cutting, cut 20-30 cm below the diseased part; for lesions on the main trunk, use a sharp knife to cut out the diseased part down to healthy tissue, then apply Bordeaux paste or a mixture of 70% thiophanate-methyl wettable powder 200-fold solution and cow dung to the wound. 4. During the flowering period, spray 3% copper oxychloride suspension. When young fruit is about 1 cm in diameter, spray 0.6% equal-amount Bordeaux mixture, 70% thiophanate-methyl wettable powder 800-1000-fold solution, or 50% carbendazim wettable powder 500-fold solution. Generally, apply once every 10-15 days, for a total of 3 sprays.
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