On the other hand, if your plant is in a humid environment (such as a greenhouse), remove everything below the first flower cluster to improve ventilation. They are important for helping to shade the ground until the plant matures.
As for stems and leaves, not the suckers, growing below the first flower cluster: If you live in a warmer zone such as Zone 9, you should leave them on until they turn yellow. This should ideally be done when the shoot is young, supple, and about 3 inches (7.6 cm) long. To remove a sucker, grab a growing tip by the base between the thumb and forefinger and bend it back and forth until it snaps cleanly. X Research source This should ensure that the majority of the nutrients are sent to the fruits, instead of being wasted on the unwanted growing tips. This keeps the plant strong by helping it grow a sturdy central stem. Do this no matter what kind of tomato plant you have. Use pruning shears or your fingers to pull off the suckers if they’re less than two inches long.Remove all suckers and their leaves below the first flower cluster. The suckers will sap energy from the rest of the plant which could lead to smaller tomatoes, so it's important to ensure these suckers are removed when they’re as small as possible. 
Tomato suckers which appear as side shoots that grow in the “V” space between the stem and a branch of a tomato plant need to be removed, as these will grow into full-sized branches. However, yellow leaves could also be a sign of iron deficiency. Older tomato leaves can turn yellow because they’re trying to provide nitrogen to younger leaves. Remove any dead or yellowing leaves, as this is usually a key sign it’s time to start pruning.
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