Reasons Why Cucumbers Turn Yellow 

You Are Growing A Yellow Cucumber Variety

If this is the situation, your cucumbers ought to be yellow and people don't need to be concerned. If one of your plants begins to produce yellow cucumbers, it's possible that the erroneous seed packet contained a seed from a yellow type. 

The fruits are over mature

Cucumbers that are overripe change colour from green to yellow, and their flesh weakens and turns bitter. Never allow overripe cucumbers to remain on the plant as this will hinder the development of fresh fruits and blossoms.

The plants are water-stressed

For a bountiful harvest of superior fruits, cucumber plants require a lot of water. Your cucumbers may start to turn yellow if the plant are under water stress. 

Nutrient deficient vines can cause yellow cucumber fruits

Because they are heavy feeders, cucumber plants need a consistent nutrition source to thrive and produce an abundance of cucumbers.

The plants are diseased

There are a number of typical cucumbers plant diseases that really can stunt growth and interfere with fruit development, frequently producing cucumbers that are yellow.

Lack of pollination can result in yellow cucumber fruits

Male and female flowers are produced separately on cucumber plants, and pollination requires the movement of pollen from the flower buds to the female bloom.

Insect damage to cucumber plants

Vegetable gardens will never be completely pest-free, and those who enjoy cucumbers are likely familiar with insects like slugs, aphids, spider mites, and cucumber beetles.

Harvesting too late causes yellow cucumbers

Cucumbers cannot produce more fruit if they are allowed to grow too long on the vine. Harvesting cucumbers frequently stimulates the plant to produce more fruit.

Viral diseases in cucumbers

Because the virus-distorted leaves are unable to function as those on a healthy plant, the plants struggle to expand and eventually stop becoming bigger.