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Water oak > Crown gall
Why Do Water oak Trees Suffer From Crown Gall?
Water oak, also known as Possum oak
Crown gall is a severe disease affecting Water oak, provoked by Agrobacterium tumefaciens, a soil-borne bacterium. It leads to tumor-like galls on the roots and lower stem, hindering water and nutrient transport, causing wilting, and potentially, plant death.

Symptom Analysis

The primary symptom in Water oak are tumor-like, woody or spongy galls, predominantly appearing on roots and lower stem. Other noticeable signs include curled leaves, delayed growth, wilting, and in severe cases, plant death.
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What Causes Crown gall Disease on Water oak?

Agrobacterium tumefaciens
This soil-dwelling bacterium invades Water oak through root injuries, with its DNA integrating into the plant's genome, causing cell proliferation and gall formation.
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How to Treat Crown gall Disease on Water oak?

Non pesticide
Physical removal: Careful manual removal of galls can help manage the disease, followed by an application of a bacterial inoculant to prevent re-infection.

Plant rotation: Rotating with non-susceptible species can limit the bacteria's viability in the soil, reducing future infections.
Pesticide
Use of antibacterials: Application of antibacterial compounds, such as copper-based fungicides, can help control the bacterium.

How to Prevent Crown gall on Water oak?

Plant hygiene
Maintaining plant hygiene by sterilizing gardening tools can prevent the spread of the bacterium.
Avoid injuries
Preventing root injuries during planting or cultivation can limit the bacterium's entry points.
Use of resistant varieties
Planting resistant species or varieties can effectively prevent the disease.
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When is Crown gall Most Active Period on Water oak?

Crown gall is most active in spring and fall. The warm, moist soil conditions during these periods are conducive for the bacteria's growth and transmission.

Infectivity

The disease is highly infectious, spread through contaminated tools, water splash, or root-to-root contact with adjacent plants.

Lethality

Crown gall is moderately lethal to Water oak. While not always deadly, it can significantly affect the plant's growth and vitality.

FAQs on Water Oak

What is crown gall and how does it affect Water oak?
Crown gall is a disease induced by the bacterium Agrobacterium tumefaciens. In Water oak, it results in tumor-like galls on roots and lower stem, leads to wilted leaves, stunted growth, and can ultimately result in plant death.
How can crown gall be detected in Water oak?
Crown gall can be detected in Water oak by checking for abnormal swelling or galls, mainly at the junction of the root and stem or in the lower stem area. Leaves can also wilt or appear curled.
When is crown gall most likely to infect Water oak?
Crown gall is most likely to infect Water oak during the warm and wet conditions of spring and fall seasons, which are ideal for bacterial growth and transmission.
How can crown gall be prevented in Water oak?
Crown gall can be prevented in Water oak by maintaining plant hygiene, avoiding root injuries during planting, rotating crops, and using resistant plant varieties.
Are there any treatments available for crown gall in Water oak?
Yes, treatments for crown gall in Water oak involve physical removal of galls, applying bacterial inoculant, plant rotation, and use of antibacterials or pesticides to control the bacterium.
Is crown gall lethal for Water oak?
Crown gall is moderately lethal to Water oak. It may not always kill the plant but can significantly hamper its growth, affect its vitality, and in severe infections, result in death.
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