I have noticed fruit and flower shedding from the second and third clusters of my tomato plants. How can I prevent this phenomenon?
These are two different phenomena. Flower shedding is usually caused by: stress, insufficient or unbalanced irrigation, lack of nitrogen or iron, or hormonal imbalance. These can all be corrected by applying precise fertigation and correcting the nutritional formula accordingly. Fruit shedding, on the other hand, can also be caused by Boron (Br) imbalance. Boron levels that are too high or too low can lead to fruit shedding. You should check your plants’ boron level, and adjust it accordingly.
Another common reason for fruit and flower shedding is pest damage. Thrips (Thrips tabaci) and Mites, such as rust mite (Abacarus hystrix) and red mite (Dermanyssus gallinae) can cause fruit and flower shedding, and should therefore be closely monitored when shedding occurs.