Answer: Squash and cucumbers usually produce male flowers before they produce female flowers and since it's early in the season, that might be why the flowers are dropping off without setting fruit. You can tell the difference between the male and female flowers by closely looking at the stem where they are attached. Male flowers have a slender, straight stem; female flowers have a slight swelling directly behind the petals. If your plants are producing only male flowers, you'll just need to wait patiently for it to produce female (fruit bearing) flowers. If they are producing female flowers which do not produce fruit, I suspect there are not pollinating insects around. In this case, you can take a male flower from the plant and "visit" the female flowers, gently touching the insides of the flowers together. This should produce fruit. Tomatoes are self-pollinating so all you need to do to transfer pollen is to gently shake the branches where the flowers are. Pollen will fall from the male to the female parts of the flowers and fruit should develop.
Hope you have a bountiful harvest!
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