Weather hardiness: fruit trees need a sufficient amount of days of cold, for a consecutive period, during their winter dormancy, or fruit production will suffer.Regarding self-pollinating, or not, tree ID will be necessary, since some are self-pollinating and others need another tree like a crab apple for cross-pollination. Hence, pollinators like bees, birds, and wind need to be present. If any tree is not self-pollinating, it needs a compatible pollinator planted nearby. Pollination is key: trees require pollination to be able to set fruit.Try to identify the variety of your trees, and then check the specific fruiting age for each. Depending on the type, and variety, this can vary from 3 to 7 years. First, fruit trees must be of a certain age before they produce.There are six basic needs for healthy fruit tree development. Going back through previous questions answered by the Toronto Master Gardeners on this problem, I have found a mine of information. The best place to start is at the beginning.
So, I will need to be more general in my answer and hope this is helpful to you. You did not mention some details which may have helped us tie down the answer such as how old your trees are, how many there are, what varieties you are growing, where you are living, and what your soil is like. Well, it’s definitely a shame that you’ve hit a patch of bad luck with your fruit trees.
You also asked whether the gypsy moth could be one of the problems. Thank you for asking your question about why your apple, pear and cherry trees have no fruit this year even though they all had numerous blossoms in the spring.
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