Which of the following crops is known to struggle with fruit set in high temperatures?

Tomatoes are particularly sensitive to high temperatures during the fruit set stage. When daytime temperatures exceed 90°F (32°C) and nighttime temperatures remain above 70°F (21°C), the pollination process can become impaired. This condition often leads to blossom drop, reduced fruit size, or the production of malformed fruit.

In contrast, peppers can tolerate higher temperatures, and though they can also experience some challenges, they are generally more resilient than tomatoes in hot conditions. Carrots are root vegetables and are less affected by temperature fluctuations regarding fruit set, given that they do not produce fruits in the typical sense. Squash can produce fruit in warm conditions, but they are less sensitive to high temperatures than tomatoes, making them more favorable for fruit set during the heat. Thus, tomatoes stand out for their significant struggle with fruit development in high-temperature environments.