Answer: Some tomato varieties are more sensitive to high temperatures than others and will fail to set fruit if the temperature is over 90F during the day. Non fruiting also be caused by lack of insect activity. You can help ensure pollination of your tomato plants by gently shaking them while in bloom. Once the flowers have been completely pollinated, and the daytime temperatures cool down a bit, you're certain to have an abundance of fruits on your plants.
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