Hi! I hope someone can help - my zucchini plants are huge, and seem healthy. Tons of blossoms, and tons of new fruit starting. However, after they get so big, they seem to start to rot. The end gets soft, and yellow. I'm new to gardening, so I'd love some help to figure this out. Thanks!
I've found that the two most common things that cause this problem in my garden are powdery mildew and pickle worms. Check first for PM, sometimes the symptoms show up first on the fruit before the classic signs are seen on the leaves and stems. Pickle worm moths lay their eggs in the blossoms where they first eat the insides of the flowers then move to the fruit, going in where the blossom is attached to the fruit. Sometimes they damage the flower so badly it cannot be pollinated. To check for pickle worms, rip the flower open. The first instar is very small, creamy white to beige and spotted.