Why Cucumber Leaves Turning Yellow And Dying in My Lawn? 😟

Cucumber Leaves Turning Yellow

Why Cucumber Leaves Turning Yellow And Dying in My Lawn? 

In summers, everyone loves to have cucumber in their salads, soups, etc., to refresh and hydrate the body. This vegetable requires sunny and warm weather with fertile soil to grow. Like other plants, you have to pay attention while planting and taking care of this crop. Everything goes fine until you see that cucumber leaves turning yellow or dying. 

It is a symptom of an existing problem in the crops. It is better not to ignore the problem and try to look for various reasons why it is happening. You can solve any issue when you know its causes. Ignorance can lead to plant death, and all your efforts will go wasted. If you want to preserve cucumber crops in your lawn, then you must go through this article. 

Get enough information regarding problems that can happen to the top growing green vegetable. Look for effective solutions after detecting the root cause and save your crops from getting severe damage.

Causes and Solutions of Cucumber Leaves Turning Yellow

1. Pests

When a massive bunch of little pests attacks the leaves of cucumber, it can start getting yellow. The pests can suck the green sap from the leaves and make them curl up. It is necessary to get rid of them to safeguard your crop. Commonly, you can observe the following pests:

  • Aphids: These insects are tiny and oval. The color of the insects may vary from yellow to green. It is hard to find them because they stick to the underside of cucumber leaves. You can detect them by observing the sticky black mold-like substance that they leave behind. 
  • Whiteflies: These are also tiny and have white wings. The commonplace where they are present are the undersides. Slowly and steadily, they suck the sap and make the leaves yellow and die. 
  • Spider Mites: It is another species of pests that accumulates on the undersides of the leaves. It sucks the sap and destroys the crop severely. 
  • Potato Leafhopper: Many people have never heard of potato leafhopper. It is a tiny green insect that loves to feed on cucumber plants. While sucking the sap, it injects the toxin into the leaves, which turns it yellow. When the leaves completely get damaged, it falls off the plant. Different types of insecticides are helpful enough to control the breeding of potato leafhoppers. As cucumber is a consumable ingredient, you need to spray the chemical carefully.

Insecticides can help you to get rid of pests on your plants. You need to spray or apply the insecticidal soap on the leaves. It is necessary to continue the treatment before you harvest the crops. While planting the crop, you can also use row covers at the starting of the season. 

2. Cucumber Plant Diseases

Many fungal and bacterial diseases can kill your plant. It is necessary to detect the disease and treat them before it damages the crop. Two types of a common virus attack this vegetable crop.

  • Mosaic: This disease makes leaves thick and brittle. The leaves may get wrinkles or curve downwards with yellow spots. It is easy to spread by various pests and leafhoppers. It is difficult to treat the virus, but you can remove all the infected plants. Leafhoppers and other pests can spread the virus all over your garden. 
  • Verticillium: It is a soil-borne fungus that leads to brown streaks on the cucumber stem. You can face this common problem if you have grown peppers, eggplant, potatoes, and tomatoes once at the same place. 
  • Powdery Mildew: You may observe some spots or coating of powder on the leaves. It is easy to detect this fungal spore disease. The main reason for the development of the disease is the high humidity level. You can resolve the issue by plucking the infested leaves and do not overwater the crop.  
  • Downy Mildew: When you observe brown and yellow spots on the leaves, then downy mildew fungus has infected your plants. It is necessary to improve air circulation by removing debris from your garden. 
  • Fusarium Wilt: It is another fungal disease that turns cucumber plants yellow by infecting the vascular tissues. Cucumber beetles carry the spores from the soil and infect the plants. It is necessary to remove all the infected plants from your lawn because fungicides will not resolve the issue. 

3. Soil Nutrition Deficiency 

The soil condition should be suitable for optimal plant growth. Fertile soil is rich in Nitrogen, Phosphorous, and Potassium, which are must for plant growth. If you do not provide an adequate amount of nutrition to the plant, the chlorosis disease will affect them. It is necessary to check the soil before the plantation of any crop. 

  • Nitrogen: If Nitrogen is deficient, it can kill your plant. Make sure that you check the content of all the essential nutrients before planting the cucumber plant. If not, then you need to use fertilizer to provide enough nutrients to the soil. If you do not find any insect or pest, then you must check the deficiency issue. You can also resolve this issue by adding mulch around the base. It is a stinky but free option for releasing nitrogen content in the soil.  
  • Iron: If the cucumber plant leaves turn yellow with green veins, then iron is deficient. It is possible to solve the problem by adding powdered or granulated chelated iron or sprat liquid iron over the plant leaves. 
  • Potassium: This vegetable crop needs loads of potassium compared to Nitrogen for optimal growth. When the tips of the leaves start turning yellow, then you can detect the deficiency of potassium. You can solve the problem by applying a balanced fertilizer. The soil may need treatment to balance the acidity and alkalinity levels. 
  • Zinc: If the leaves size is smaller than expected and is turning yellow, then zinc must be missing. It will restrict the growth of the plant, and it can kill after some time. Spray the solution of zinc sulfate to resolve the issue. 

4. Watering Issues

Providing adequate water is essential for the perfect growth of cucumber plants. Over-watering can cause oxygen depletion, and hence, it will make leaves yellow and dying. This vegetable needs one to two inches of water every week for perfect growth. 

If there is a drainage issue, mix some sand with the soil to loosen it. You can also opt for the raised beds for the plantation of crops. Measure the levels of moisture in your soil by using gadgets. Prevent an issue of overwatering or underwatering. 

5. Lack of Sunlight

Cucumber plants need sunny and warm weather to grow. If there is a lack of sunlight, then its leaves can turn yellow. It is necessary to provide sunlight for at least 6 hours a day. Therefore, you have to move or sow your plants at a place where there is plenty of sunlight.

Why the Color of Cucumber TurningYellow?

Many factors affect the color of the cucumber, and it turns from green to yellow. Such as:

  • Virus: Any virus attack like mosaic can change the color of the vegetable from green to yellow. The bitter taste is another side effect of the virus. 
  • Nitrogen Deficiency: If the soil is deficient in Nitrogen, it can also affect vegetable growth. It can grow in yellow naturally. 
  • Late Harvesting: If you have not harvested the cucumber from the vine for too long, the color will change to yellow. There are chances of getting spongy texture with sturdy and large seeds. 
  • Overgrowing: Many people think that if they keep cucumber growing big, then overgrowing can affect the vegetable. When they get large, you cannot consume them. If you leave the plant to overgrow, then it will only affect the vine.

How to Grow Fruitful Cucumber?

If you want to get good-quality cucumbers, you have to plan for the successive planting every two weeks. It is necessary to harvest the crops continuously. Undoubtedly, this vegetable grows faster compared to others. Every six weeks, high-quality cucumbers are ripe and are ready to harvest. Consider the following things for harvesting fruitful cucumbers:

1. Right Time to Plant Cucumbers

The seeding must be done two weeks earlier than the last date of frosting. There are high chances of cold damage, and therefore, it needs 70oF for germinating the seeds

2. Choose the Right Place for Planting Cucumber

It is necessary to choose a perfect site for planting cucumber with full sun and fertile soil. Start composing in aged manure before sowing the seeds at a depth of 2 inches. Keep the soil drained and moist instead of compacted and soggy. The soil must be neutral or slightly acidic of PH 6.5 to 7.0. In the case of clay soil, add peat compost or rotted manure. Sandy soils are also perfect for growing cucumber because they can get warm in the summer and spring seasons.  

3. Create the Perfect Space or Trellis

The distance between plants should be two to three feet, and the sowing depth should be one inch. If you live in a cool place, then cover the surface with black plastic to make it warm. After planting, mulch the surface area with chopped leaves, straw, and other organic mulch. The mulching is necessary to avoid pests and diseases. You can also prepare a trellis for the vine to climb over it. The process will reduce the damage to the vegetable. 

4. Taking Care of Cucumbers

It is vital to water your cucumber plants frequently. If the water levels are inconsistent, then it can make them taste bitter. You have to add water if you observe that your finger is dry. Consider drip irrigation or a soaker hose for watering the cucumber plants and keep the foliage dry. 

5. Using a Liquid Fertilizer

Consider a liquid fertilizer with high Phosphorus and Potassium and low Nitrogen. After blooming, apply it once every three weeks. You should apply directly on the soil instead of leaves. You can also consider the granular one. Make sure that you do not over-fertilize your plants.

Final Thoughts

Planting and harvesting cucumber plants are not easy things to do. Many factors can make cucumber leaves turn yellow. It can be a disease, pest, lack of nutrition, water, or sunlight. It is crucial to get enough knowledge about this crop before planting it in your garden.

Everyone loves eating cucumber because it hydrates our body and does wonders for our health. It is a fast-growing plant, which needs some attention for proper growth. Consider all the causes that are turning cucumber leaves yellow and know how to resolve your issues.

By Charles

Charles S. Nelson is a Canadian gardner & foodie, and the founder & editor of Decorateagarden.com. Join Charles as he shares everything he has learn in past 15 years in gardening. So, Stay tune with him to get boatload of tips on gardening.😁

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