Why Are My Cucumber Plants Wilting?

Are the leaves wilting despite constant watering? Do you alert brown, white, or yellow spots on the leaves or cucumbers? Your cucumber plant may be infected by bacterial, viral, and/or fungal pathogens. Diseased plants may not create as much fruit (if any), and also any kind of fruit that is created might not be palatable or edible. This post will certainly discuss the most widespread cucumber conditions, what reasons them, and also just how to treat and proccasion them.

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10 Typical Cucumber Diseases

Alternaria Leaf Blight (Alternaria cucumerina)Anthracnose (Colletotrichum orbiculare)Bacterial Leaf Spots (Pseudomonas syringae, Septoria cucurbitacearum, or Xanthomonas campestris)Bacterial Wilt (Erwinia tracheiphila)Cucumber Mosaic (Cucumber mosaic virus)Downy Mildew (Pseudoperonospora cubensis)Fusarium Wilt (Fusarium oxysporum)Powdery Mildew (Podosphaera xanthii or Erysiphe cichoracearum)Rhizoctonia Belly Rot (Rhizoctonia solani)Verticillium Wilt (Verticillium dahliae)


Alternaria leaf blight on tomato leaves. Keep in mind the brvery own spots via yellow edges on the leaves.

Dwight Sipler/Wikimedia Commons, CC 2.0 (modified)

1. Alternaria Leaf Blight


Fungus (Alternaria cucumerina)

This disease more generally affects melons however have the right to additionally affect cucumbers. The fungal spores have the right to be brought in by wind or spreview through contaminated soil and also water. Wet and also warmth problems favor the condition. The fungus have the right to endure over winter in plant debris to attack the plants aget in the spring.


Irregular brown spots on the leaves—periodically via yellow edges.

This illness generally affects mature leaves. You might view small, brown spots at initially. These brvery own spots have the right to prosper into irconsistent shapes with a yellow halo. Soon after, the leaves rotate brvery own, wilt, and die, exposing the fruits to straight sunlight that can scald them.


Fungicides—either commercial or homemade.

The just method to treat fungal illness is with fungicides. Tright here are many type of brands available at your neighborhood nursery, yet note that fungicides might make the fruits inedible.You deserve to also attempt spraying homemade fungicides made of a mixture of soapy water, baking soda, and vinegar. Some organic gardeners additionally opt for copper fungicides.If only a few components of the plant are impacted, cut and also rerelocate those parts to prevent the fungus from spanalysis.If the plant is severely infected, you may need to remove the totality plant, treat or relocation the soil, and also begin over.


Yellow or brown spots on the leaves can indicate an anthracnose infection.

Scot Nelson/flicker, Public Doprimary (modified)

2. Anthracnose


Fungus (Colletotrichum orbiculare)

Anvarious other fungal condition, anthracnose is many prevalent in wet and warmth conditions. Regions through high humidity choose southern and mid-Atlantic claims are highly prone to fungal plant diseases.

The fungus overwinters in fallen vines, leaves, and various other plant debris, releasing spores in the spring to infect brand-new plants. The spores (conidia) need moisture and also mild temperatures to germinate.


Yellow, water-soaked, circular spots on the leaves and also fruit via dark brvery own to babsence edges.

You may see circular, yellow spots on the leaves that are little at initially yet enlarge as the condition progresses. Spots on the fruits may show up black and also sunken with a pink- or salmon-colored gelatinous substance in the facility. This gelatinous substance is a cluster of fungal spores—a characteristic sign of anthracnose.


Fungicides (Bravo or Benlate)

Aget, treated fruits are not edible. If a big component of your plant is infected, you might need to rerelocate the whole plant and also begin over through sanitized soil.

Spray fungicides according to the instructions on the product label. In rainy periods, even more frequent applications might be required.Chlorothalonil (Bravo) and also benomyl (Benlate) are famous fungicides provided to treat anthracnose.

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Bacterial leaf spots on hibiscus leaf. Notice the brvery own spots are contained within the veins of the leaves, providing them an angular appearance.

Scot Nelson/flickr, Public Doprimary (modified)

3. Bacterial Leaf Spots


Bacteria (Pseudomonas syringae, Septoria cucurbitacearum, or Xanthomonas campestris)

The bacteria that reason leaf spots are opportunistic, spanalysis with lesions produced by insect bites and through seeds that spreview the bacteria via call via water. However before, they are not as hardy as other pathogens. Although they deserve to overwinter in plant debris, they need wet and cool conditions to prosper.


Small, brownish, angular or circular spots—periodically through yellow edges—or babsence spots on the leaves.

Depending on the genus of bacteria infecting your plant, the symptoms might differ slightly—especially in the at an early stage stages. Xanthomonas infection generally causes brown spots through yellow edges, while Pseudomonas infection generally causes reddish-brvery own spots. In both instances, spots will certainly quickly revolve black.

Spots on the leaves and fruit deserve to offer various other pathogens—particularly fungi—the chance to infect. This illness often reasons leaves to loss off, making fruits fragile to sunscalding.


There is presently no efficient therapy for bacterial leaf spots.

Prevention is still thought about the finest manage method.

Look for cucumber beetles founding early on in the spring, when the weather starts to heat up. They normally come out in beforehand evening. Remove them as you check out them.Use plant covers or row covers to proccasion beetles and also other pests from accessing your plants.Clear your garden of weeds, which cucumber beetles likewise feed on.Plant tansy, catnip, and/or radish plants nearby, which have the right to repel the cucumber beetles.Spray insecticides to control the beetle population.Sanitize gardening devices, consisting of boots, gloves, spades, and also shears.Provide plenty of air circulation by spacing plants acomponent and propping them up over the soil.
Both striped and spotted cucumber beetles have the right to spread the bacteria that causes the cucumber leaves to revolve yellow and wilt.

Raleigh City Farm/flickr, CC BY 2.0

4. Bacterial Wilt


Bacteria (Erwinia tracheiphila)

Bacterial wilt is spread greatly with cucumber beetles (striped and also spotted). The cucumber beetle is a tiny insect—yellow in color with either black stripes or spots on its earlier. It picks up the bacteria while feeding on infected cucumbers and also transfers them to other plants in the very same manner. The bacteria make it through winters by living in their beetles' guts.


Yellow, wilting leaves that appear to be drying out.

Originally, you'll just watch a few yellowing, drying, and also wilting leaves. Within a few days, the stems and also vines will also wilt, turning yellow and brvery own. One method to tell if it's bacterial wilt is to reduced a section of the influenced stem and also area it in a glass of water. The presence of a milky sap oozing from the reduced signifies bacterial wilt.


Tbelow is presently no effective therapy for bacterial wilt.

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If a large component of your plant is affected, it's ideal to remove the entire plant from your garden. Again, prevention is still the finest therapy. Make sure you use sanitary social methods and stop exposing stems, leaves, and also fruit to water and soil call.