6 important Avocado Tree Diseases you must to know

Like other trees, the avocado tree is also susceptible to diseases. This article gives you an overview of the various kinds of diseases that affect this tree.


The avocado tree is a tropical evergreen/sub evergreen tree, which is native to Central America and Mexico. The tree, if properly cultivated and cared for, can reach a height of up to 60 feet, but the normal height seen is around 30-40 feet. The fruit of the avocado tree―its most nutritious part,―is full of essential nutrients, dietary fiber, vitamins, potassium, and magnesium. It is a good source of mono-saturated fat, which is considered a healthy fat.

The avocado fruit is a regular in American households and is a common ingredient in many recipes. An average-sized avocado tree generally produces 120 avocados annually. A subtropical and tropical climate with good sunlight is favorable for the smooth cultivation and growth of this tree.


Common Avocado Tree Diseases


It is prone to diseases of various kinds which can hamper its growth. There are a number of causes, some of them being―improper irrigation, injury of some kind, environmental and soil conditions, and infections.

Powdery Mildew


Powdery MildewPowdery MildewPowdery mildew is basically a fungal disease that affects the leaves. It is characterized by the appearance of purplish and brownish spots on the lower side of the leaves and greenish or yellowish spots on the upper side. In mild cases, this infection can be removed by rubbing the leaves. In severe cases, a powdery substance appears on the leaves. A fungicide is generally used to treat this disease.

Avocado Root Rot


Avocado Root RotAvocado Root Rot 

This is a fungal disease that basically affects the roots of the avocado tree. The roots start getting brittle once they are affected. Eventually, the twigs and stems begin to die, and the leaves fall off. This disease is characterized by the appearance of pale yellow leaves and low fruit production. It can be cured using a fungicide.

Pseudocercospora Spot


Pseudocercospora SpotPseudocercospora Spot 

This is another disease that affects the avocado tree, especially in warm and humid weather. The fruits, stem, and leaves are commonly infected, and brown-black lesions appear on the infected leaves. It is treated by using azoxystrobin spray.

Anthracnose Fruit Rot



Anthracnose Fruit RotAnthracnose Fruit RotThis is another fungal disease that affects the fruits, stems, and flowers of the tree. It is caused by a fungus called Colletotrichum gloeosporioides. Regular use of fungicides helps in the prevention of this disease which is characterized by the appearance of dark sunken spots on the avocado fruit, which rapidly spread to the surrounding tree structures.

Avocado Black Streak


Avocado Black StreakAvocado Black Streak 

This disease is characterized by the appearance of lesions and cankers and affects the fruit production of the tree. It also causes yellowing of the leaves. It can be best prevented by using proper irrigation techniques and soil fumigation.

Avocado Sunblotch


Avocado SunblotchAvocado Sunblotch 

This viral disease lowers the yield of the tree and also results in poor quality fruit. It is caused by a virus called ASBV (Avocado sunblotch viroid). This disease is serious and the virus can be passed to other trees as well.

List of Other Diseases



Armillaria root rot
Shoestring root rot
Black mildew
Butt rot
Branch canker
Cercospora spot
Collar rot
Dematophora root rot
Fruit rot
Leaf spots
Phomopsis spot
Phytosalospora crown rot
Pink rot
Root and bark rot
Rosellinia root rot
Seedling Blight
Smudgy spot
Tar spot
Verticillium wilt
Wood rots


Bacterial canker
Blast and bacterial fruit spot
Crown gall


Trunk pitting


Algal spot
Black streak
Littleleaf rosette



List of avocado diseases

Avocado trees are versatile in adaptation to different soil and environmental conditions and grow best in full/partial sunlight. Select a place big in terms of area to grow them in order to avoid problems in the future. The roots of this tree are quite big and strong and may pose a threat to the trees surrounding it. Do not water a young avocado plant frequently and fertilize it after the first year. Well-drained soil with a pH of 6-7 is best suited for this tree.