Different Types of Disease of Avocado Tree symptoms on fruits, leaves, and stem.

Avocado Tree Disease: Causes, Symptoms, and Prevention


Avocado trees are popular for their nutritious fruit and attractive foliage, but they are not immune to diseases. Like all plants, avocado trees are susceptible to various diseases caused by fungi, bacteria, viruses, and other pathogens. Avocado tree disease can significantly affect the tree’s growth, fruit quality, and yield. As such, it is essential to identify the symptoms of different avocado tree diseases and take preventive measures to keep the trees healthy.

This article discusses common avocado tree diseases, their causes, symptoms, and prevention measures.

You Can read in-depth about: 
Avocado Tree Cultivation: A Comprehensive Guide

Types of Avocado Tree Diseases:

Avocado trees are susceptible to different diseases, some of which are lethal, while others cause mild or moderate symptoms. Here are the most common avocado tree diseases:


Phytophthora Root Rot:

Phytophthora root rot is one of the most common avocado tree diseases caused by a fungus-like organism, Phytophthora cinnamomi. This disease is prevalent in areas with heavy clay soil and poorly drained soils. The fungus attacks the tree’s root system, leading to stunted growth, yellowing leaves, and eventual death.

avocado tree and root affected Phytophthora Root Rot disease.

Phytophthora Root Rot


Anthracnose is a fungal disease caused by Colletotrichum gloeosporioides. It affects the tree’s leaves, twigs, and fruit. The disease causes the leaves to turn brown and fall off, leading to defoliation. It also causes black, sunken lesions on the fruit, making them unsuitable for consumption.

Symptoms of anthracnose on avocado fruit and leaves.


Avocado Sunblotch Viroid:

Avocado Sunblotch Viroid (ASBV) is a viral disease that affects avocado trees. It is transmitted through infected buds, grafting, or pruning equipment. The disease causes yellowing of leaves, reduced fruit size, and scarring on the fruit.

Avocado Sunblotch symptoms on leaves and fruit.

Sunblotch Viroid

Verticillium Wilt:

Verticillium wilt is a fungal disease caused by Verticillium dahliae. It affects the tree’s vascular system, leading to yellowing, wilting, and death of the leaves. The disease causes the tree to die from the top down, and there is no cure once the tree is infected.

Verticillium Wilt symptoms on the avocado tree and stem.

Verticillium Wilt

Symptoms of Avocado Tree Disease:

Different avocado tree diseases exhibit different symptoms. Here are the common symptoms of avocado tree diseases:

    • Yellowing of leaves
    • Brown spots or lesions on leaves
    • Wilting of leaves
    • Defoliation
    • Sunken lesions on fruit
    • Reduced fruit size
    • Scarring on the fruit
    • Stunted growth
    • Death of the tree

Prevention of Avocado Tree Diseases:

Preventive measures are essential to keep avocado trees healthy and free from diseases. Here are some preventative measures:

Plant in well-drained soil:

Avocado trees thrive in well-drained soil. Planting the trees in poorly drained soil increases the risk of Phytophthora root rot.

Provide proper nutrition:

Avocado trees require balanced nutrition to maintain healthy growth. Fertilize the trees with a balanced fertilizer and maintain the soil pH between 6 and 7.

Practice good sanitation:

Clean pruning equipment and grafting tools to prevent the spread of diseases. Remove and destroy infected leaves and fruit.

Control pests:

Pests can damage avocado trees and make them susceptible to diseases. Control pests such as mites, thrips, and beetles.


Frequently Asked Questions (FAQs):

How do I know if my avocado tree is infected with a disease?


How do I know if my avocado tree is infected with diseases?

Different diseases exhibit different symptoms. Keep an eye on your avocado tree for signs of yellowing leaves, brown spots or lesions on leaves, wilting or defoliation, sunken lesions on fruit, reduced fruit size, or scarring on the fruit. If you notice any of these symptoms, take action to diagnose and treat the disease.

Can I treat avocado tree diseases once they have infected the tree?

It depends on the disease and the severity of the infection. Some diseases such as Phytophthora root rot have no cure, and the infected tree must be removed to prevent the spread of the disease. Other diseases such as Anthracnose can be managed with fungicides or cultural practices. Consult a professional for the best course of action.

Can I prevent avocado tree diseases?

Yes, preventive measures such as planting in well-drained soil, providing proper nutrition, practicing good sanitation, and controlling pests can help prevent avocado tree diseases.



Avocado tree diseases can significantly impact the growth, fruit quality, and yield of avocado trees. It is essential to identify the symptoms of different diseases and take preventive measures to maintain healthy trees. Planting in well-drained soil, providing proper nutrition, practicing good sanitation, and controlling pests can help prevent avocado tree diseases. Consult a professional if you suspect your avocado tree is infected with a disease to diagnose and treat it promptly.


I am Gaushoul Agam

𝐂𝐨-𝐅𝐨𝐮𝐧𝐝𝐞𝐫 & 𝐂𝐄𝐎

I am an experienced Horticulture Officer in the Department of Agricultural Extension in Bangladesh. I am committed to improving agriculture and farming.

I created ToAgriculture to address global food safety concerns. These concerns are caused by a growing population, diminishing farmland, and the impact of climate change on agriculture. I assist readers in learning modern farming techniques.

I also help them control pests and diseases. Additionally, I guide managing agriculture sustainably. All of this is aimed at creating a better and more successful future in farming.

I have experience in field crops and horticulture crops. I know about fruit and vegetable farming, managing pests and diseases, irrigation, and grafting. Come with me as I share my knowledge and experiences to help you create a better future.

3 thoughts on “Avocado Tree Disease: Causes, Symptoms, and Prevention

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    1. Admin Post author

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  2. Pingback: Can You Grow Avocados in Arizona? Thriving Tips! - ToAgriculture

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