Fruitset

Later, Schaible (49) also noticed that tomato fruit-set is generally poor when the night temperature exceeds 23 °C. Howlett (25) points out that both night and day temperatures are important factors limiting tomato fruit-set.

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Most workers who have studied the use of auxin sprays on tomatoes have found that although forcing fruit-set on the first 3 or 4 clusters is beneficial, auxin applications to flowers on higher clusters have very little effect.

Source: wiktionary

There is a strong and positive correlation between fruit-set and gamete viability (Prasad et al., 2017). Gamete functions (pollen and ovule) is the most important factor for fruit-set under HS. In tomato, fruit-set has been shown to[…]

Source: wiktionary