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Common Problems of Mango in the Florida Home Landscape

Mangos are grown in tropical and subtropical lowlands throughout the world. In Florida, mangos are grown commercially in Dade, Lee, and Palm Beach Counties and as dooryard trees in warm locations along with the southeastern and southwestern coastal areas and along the southern shore of Lake Okeechobee. In Florida, there are different pests and diseases affecting mango production but most of them are not intensive for the home landscape. Homeowners should contact their local UF/IFAS Extension office for recommended control measures.

  1. The flowers on the mango tree turn black

The most important disease of mango in Florida is anthracnose. The anthracnose fungus attacks flowers, young fruits, leaves, and twigs. It also appears as a storage disease of mature fruits. Symptoms appear as black, slightly sunken lesions of irregular shape, which gradually enlarge and cause blossom blight, leaf spotting, fruit staining, and fruit rot. Disease development is encouraged by rains or heavy dews. Prevention can be accomplished by maintaining a coating of fungicide on susceptible parts starting when bloom buds begin to expand and ending at harvest.

Tear staining caused by anthracnose. Credit (UF Extension)

Anthracnose symptoms on mango flowers. Credit (UF Extension)

Anthracnose symptoms on mango flowers. Credit S. Nelson (University of Hawai Extension

  1. There are brown spots on the mango tree leaves

Brown spots on the leaves of the mango trees are another symptom of the disease anthracnose. Preventative sprays can reduce the risk of infection.

Anthracnose symptoms on mango leaves. Credit (UF Extension)

  1. The young trees wilt gradually

Verticillium wilt is usually observed in new trees planted on land previously used for vegetable production (especially tomatoes). This fungus attacks the tree roots and vascular (water-conducting) system, decreasing and blocking water movement into the tree. Symptoms of infection include leaf wilting, desiccation and browning, stem and limb dieback, and browning of the vascular tissues. Occasionally verticillium will kill young trees. Control consists of removing affected tree limbs by pruning.

Fruit splitting because of Anthracnose. Credit (UF Extension)

Anthracnose symptoms on mango fruits. Credit S. Nelson (University of Hawai Extension

Anthracnose symptoms on mango fruits. Credit S. Nelson (University of Hawai Extension

  1. The mango fruits split

The unfavorable weather conditions (high temperature, heavy rainfall, and humidity) may be the main reasons for fruit splitting in mango.

  1. Mango trees flower but not set fruit

The main reason why the mango trees flower but not setting fruit is anthracnose disease which attacks all parts of the trees but most damage occurs to the flower panicles. Severe infections will destroy the panicles and accordingly affecting potential fruit set and production.

Control of Anthracnose:

A good fungicide program is an effective method to control anthracnose. Start spraying fungicide as soon as you see panicles (a loose branching cluster of flowers) on trees and continue spraying with appropriate intervals until the preharvest period. Homeowners are recommended to plant resistant varieties like Indo-Chinese/Philippine-type.

For more information please read EDIS article.