Watermelon Bacterial Rind Necrosis: What Causes Watermelon Rind Necrosis

Watermelon Bacterial Rind Necrosis: What Causes Watermelon Rind Necrosis

By: Teo Spengler

Watermelon bacterial rind necrosis sounds like an awful disease you could spot on a melon from a mile away, but no such luck. What is watermelon rind necrosis? What causes watermelon rind necrosis? If you’d like more information about watermelon bacterial rind necrosis, this article will help.

What is Watermelon Rind Necrosis?

Watermelon bacterial rind necrosis is a disease that causes discolored areas in the rind of the melon. The first watermelon rind necrosis symptoms are hard, discolored rind areas. Over time, they grow and form extensive dead-cell areas on the rind. These usually do not touch the melon flesh.

What Causes Watermelon Rind Necrosis?

Experts believe that watermelon rind necrosis symptoms are caused by bacteria. They think that the bacteria is naturally present in the watermelon. For reasons they do not understand, the bacteria causes symptom development.

Plant pathologists have identified different bacteria from necrotic areas in the rind. That’s why the disease is often referred to as bacterial rind necrosis. However, no bacteria has been identified as the one that causes the problems.

Currently, scientists conjecture that the normal watermelon bacteria is affected by a stressful environmental condition. This, they speculate, triggers a hypersensitive response in the fruit rind. At that point, bacteria living there die, causing nearby cells to die. However, no scientists have verified this in experiments. The evidence that they have found suggests that water stress may be involved.

Since the necrosis does not cause watermelon rind necrosis symptoms on the outside of the melons, it is usually the consumer or home growers who discover the problem. They cut into the melon and find the disease present.

Bacterial Rind Necrosis Disease Control

The disease has been reported in Florida, Georgia, Texas, North Carolina, and Hawaii. It has not become a severe annual problem and shows up only sporadically.

Since it is difficult to identify fruits that have been infected by watermelon bacterial rind necrosis before cutting into them, the crop cannot be culled. Even a few diseased melons can cause an entire crop to be taken off the market. Unfortunately, no control measures exist.

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Read more about Watermelons

Why are my watermelon leaves curling?

If watermelons are wilting, this might indicate that there's a fungal problem coming from the soil. Fusarium wilt of watermelon causes plants to wilt, and it may begin in one or more vines. Pull out a plant and look for any browning or discoloration at the base or on the roots.

Also Know, how often should I water my watermelon? Watering Schedules Watermelons do not need a particularly large amount of water at planting times, though they benefit from a thorough drenching of 1 to 2 inches of water every week. Make sure the soil is wet to a depth of 6 inches every time you water.

Considering this, how do you control the pest in watermelon?

Soap solutions are an all-purpose way to get rid of numerous types of garden pests, including aphids on watermelon plants. Mix 1 tablespoon of liquid castille soap in 1 gallon of water, shake it well and spray all leaf surfaces, including the undersides of the leaves. This mixture dehydrates aphids.

What is wrong with my watermelon?

Mold or dark-colored spots on the outside of the watermelon could indicate that it has gone bad. The mold might be black, white, or green, and have a fuzzy appearance. Look for a healthy color outside. The watermelon should have either a consistent pine green shade or a striped appearance.

How to Tell if a Watermelon Is Bad

Last Updated: July 13, 2020 References Approved

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Watermelon is a delicious summer treat, but to protect your health, it’s important to know if a watermelon is bad. One way you could discover whether your watermelon is bad is by checking for mold or a foul smell. You could also use the expiration date to tell if the watermelon is bad.

Watermelon Diseases

Gummy stem blight is caused by the fungus Didymella bryoniae (anamorph: Phoma cucurbitacearum). Leaf lesions initially appear as dark, greasy-appearing spots that dry with age. Conidia, which are produced within fruiting bodies (called pycnidia) formed in the lesions, are spread primarily by splashing rain.

Fusarium wilt, caused by Fusarium oxysporum f. sp. niveum, may cause wilting of individual runners or collapse of the whole plant.

Anthracnose lesions, caused by Colletotrichum orbiculare, can occur on all aboveground parts of the watermelon, including the fruit. Lesions on leaves are typically irregular in shape and are often associated with the leaf veins.

Gummy stem blight lesions occurring on the runner vines may cause them to wilt and die, but lesions on the crown may kill the whole plant.

Characteristic browning of the vascular tissues associated with Fusarium wilt.

Cucurbit downy mildew is Pseudoperonospora cubensis, an Oomycete or water mold that attacks the foliage. Typical symptoms include the appearance of small chlorotic spots that quickly become necrotic as well as upward curling of the leaves. When disease is severe, loss of the leaf canopy exposes the fruit to the sun, and they may burn.

Bacterial rind necrosis is reported to be caused by a variety of bacteria, including Erwinia sp., that normally reside within healthy tissues. Symptoms are rarely evident until the watermelon is cut open.