Why Are My Cucumber Leaves Turning White Around The Edges

The margins of cucumber leaves are the first to get infected by powdery mildew. The unchecked growth of white powdery patches will continue to infiltrate the leaf until the whole leaf looks white.

When the little white spots expand and mix, the white powdery material will cover the whole stalks and leaves. The fungus can spread throughout the whole cucumber vine if it is not treated.

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Even though the white fungal spores don’t get on cucumber leaves directly, their mature stages block sunlight from reaching the plant. The plant’s leaves are unable to perform photosynthesis, slowing its growth.

Cucumbers will be smaller, fewer, and of worse quality as a result of leaf drops. To avoid getting sunburned, pick cucumbers before the leaves begin to fall. Cucumbers that are left out in the open are more vulnerable to pests and birds hunting for a free meal.

It is most certainly powdery mildew if the margins of cucumber leaves are tinged with white. White spots appear on leaf margins as the illness progresses.

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How To Fix It

Your cucumbers will thank you if you make an antifungal spray. Put one teaspoon of baking soda in an empty spray bottle, then fill the container with 8-12 glasses of water. Close the lid and shake vigorously until the solution is completely dissolved. Adding four drops of vegetable or horticultural oil to the mixture aids in adhesion.

Do this immediately after seeing any white patches on the leaves. To get rid of the issue, apply the solution once a week to the leaves and the soil around them. The plant should be dug out and the soil replaced if powdery mildew is a problem regularly. Get a fresh container and use sterile soil if you’re growing it in a pot

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If you’re going to plant directly in the ground, be sure to do a soil test beforehand. For fungus-infested items, you’ll need to take intentional measures in the repair process.

After transplanting cucumbers, a white, fuzzy material may form on the leaves. Transplant shock or powdery mildew are the only two possible explanations. Most of the time, it’s powdery mildew.

Powdery Mildew or Transplant Shock?

Transplant shock may be to blame if your plants have just been moved and you detect white fuzz on their leaves. Check back in a few days to see whether the issue has worsened or has been resolved on its accords.

Fungal growth in the soil could be the cause if it doesn’t go away or even gets worse. Root or stem damage might be a more significant problem.

How to Correct It

All of your cucumber plants should be dug out and moved to a new, healthier location, or potted. A bigger quantity of leaf fungicide combination may be mixed into the soil after it has been dug up and tilled. Mix two and a half tablespoons of vegetable or horticultural oil with four teaspoons of baking soda for every gallon of water.

If you want to keep your cucumber leaves from becoming white, here are some suggestions:

Finding issues before they become a problem is the greatest way to prevent pests and illnesses from damaging your cucumbers. Powdery mildew is notoriously tough to eradicate, so being proactive in your defense against it is essential. It’s all about being savvy and anticipating potential outcomes.


Few times throughout the growth of cucumber plants do you need to apply fertilizer. Planting a seed or seedling in the earth with compost or slow-release fertilizer is the first step. Then, around every two months, top up the compost around the roots of the plants. So long as your soil doesn’t contain a too high concentration of water-soluble phosphorus, you should be OK.

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Inadequate Lighting and Ventilation

Providing too much shade for cucumbers, which like full light throughout the day, is a bad idea. Fungi, on the other hand, cannot thrive in direct sunshine. Sunlight will reach all the leaves if the seeds are spaced at least an inch apart. It’s important to prune and trim trees to ensure that adequate light and air can get through, as well.

Use Minimal Amounts Of Water

Cucumbers need to be watered once a week until the top six to eight inches of the plant absorb some liquid. Water stress may weaken a cucumber’s ability to defend itself against pests and disease. Water in the morning so that the leaves have time to absorb the water and the soil has time to dry out before nightfall.

Watering should be avoided in locations where humidity levels are between 80 and 90 percent. If the soil is dry, the leaves nevertheless take in water from the air around them to stay hydrated. Watering will have to be done more regularly in dry, arid locations.

Infected Soil By Fungi

The soil should be tested before putting any seeds or plants in the ground. Baking soda, oil, and water (as described above) may be used to kill fungus if found to be infected.

In around one to ten days, check back to see whether the situation has improved. Compost-rich soil might be added if an infection is still present. The soil should be ready for planting after a few more cycles of this procedure.

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Seeds That Are Resistant To Mildew And Pests Should Be Chosen

Using disease- and pest-resistant seeds is the best method to keep your cucumber plants healthy. Choosing the Salad Bush cultivar is a fantastic option


When the leaves of your cucumbers turn white, it’s almost always powdery mildew, but there are other possibilities. Early detection of an issue will ensure that your crop will not suffer as a result. A low yield and poor-quality fruit might follow if the problem is allowed to persist.

Using baking soda can help you keep the symptoms under control and even lessen their severity. It’s also possible to employ a commercially available fungicide. Before planting, it’s preferable to adopt a preventive strategy and attempt to avoid issues before they arise.

This implies that in addition to using mildew- and pest-resistant seeds, you should also use the best soil possible. Take care with watering, sunshine, and fertilizer as well.

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