Squash Blossom End Rot: Causes and Treatment

As gardeners, we all have experienced the frustration of seeing our beautiful squash plants with rotten fruits. Squash blossom end rot is a common problem in summer squash, causing the fruit to rot from the blossom end before it ripens. In this article, we will discuss the causes and treatment of squash blossom end rot.

What is Squash Blossom End Rot?

Squash blossom end rot is a condition that affects the fruit of summer squash, such as zucchini, yellow squash, and pattypan squash. It appears as a brown or black spot on the blossom end of the fruit, which may enlarge and cause the fruit to become soft and mushy. The rot may start as a small water-soaked area that gradually turns brown or black as the fruit matures.

Causes of Squash Blossom End Rot

The main cause of squash blossom end rot is a deficiency of calcium in the developing fruit. Calcium is an essential nutrient for plant growth and development, and it plays a vital role in cell wall formation in fruits and vegetables. When there is not enough calcium available in the soil, the plant cannot transport sufficient amounts of calcium to the developing fruit, leading to blossom end rot.

Other factors that can contribute to squash blossom end rot include:

• Irregular watering: Inconsistent watering can affect the plant's ability to absorb nutrients from the soil.
• High humidity: High humidity can interfere with the plant's ability to take up calcium from the soil.
• Excessive nitrogen: Too much nitrogen can promote vegetative growth at the expense of fruit development.
• Acidic soil: Soil pH below 6.0 can hinder the uptake of calcium by the plant.

Treatment of Squash Blossom End Rot

The key to preventing squash blossom end rot is to provide adequate levels of calcium to the developing fruit. Here are some tips to prevent and treat squash blossom end rot:

1. Test your soil: Have your soil tested to determine its pH and nutrient levels. If the soil pH is below 6.0, add lime to raise the pH and make calcium available to the plant.
2. Water consistently: Water your plants regularly and deeply to ensure even moisture levels in the soil.
3. Add calcium: Add calcium to the soil by applying gypsum or crushed eggshells around the base of the plant.
4. Reduce nitrogen: Avoid over-fertilizing with nitrogen, as it can lead to too much vegetative growth and less fruit production.
5. Use mulch: Use organic mulch around the base of the plant to maintain consistent moisture levels in the soil.

Squash blossom end rot is a frustrating condition for gardeners, but it can be prevented and treated by providing adequate levels of calcium to the developing fruit. By following the tips outlined in this article, you can enjoy a bountiful harvest of healthy, delicious summer squash.

A squash plant affected by blossom end rot

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