zucchini blossoms rot, or bug invades fruit

Question

Zucchini blossoms rot during and after fruit develops. The rot (or bug) then enters fruit and rots same.

Answer 1

Depending on how large the fruit get, it is either blossom end rot or poor pollination. These articles will help:
https://www.gardeningknowhow.com/edible/vegetables/zucchini/zucchini-fruit-fall-off-the-plant-before-they-are-full-grown.htm
https://www.gardeningknowhow.com/edible/vegetables/squash/squash-blossom-end-rot-causes-and-treatment.htm