I'm no expert, but have grown zucchinis in our summer garden for several years. If the plants look healthy and they have been producing nicely otherwise, I think they may be taking a little "rest". Mine did that a few weeks ago. When they stopped producing (the females were turning yellow and falling off and there were only a few male blossoms), I added some 10-10-10 fertilizer around them and watered it in. I saw this suggestion on another tread in this forum and in my case, it worked. They are producing lots of fruit again.

Hope this helps.

I agree with opal. Mine go through a period of about two weeks of very high production (about 1-2 per day per plant) and then stop for a couple weeks. They start back up in a slower production mode. Between pests killing some and the slower production mode we still get plenty.

You don't say which of the Worm Poop products you are using but they are high N and a more balanced fertilizer that provides more phosphate and potassium would be of great benefit. Once a plant is well established, it isn't nitrogen that it needs but P and K. In fact frequent doses of high N fertilizers will cause the plant to switch from fruit production back to leaf growth.

It is the phosphates that allow the plants to make blooms and fruits.

Dave

Does this particular zucchini plant have any maturing fruits on it? If it has some large fruits, it may choose to abort developing fruits and flowers in favor of growing a huge zucchini.

Thanks everyone, I just got home from work and went out to look at them, one of them seems to be producing a female that will bloom tomorrow (unless it turns yellow overnight) so I'm crossing my fingers. I thought that my problem might have to do with fruit load, that it had reached it's maximum or that it was sacrificing "proto-zukes" in favour of maturing ones, so I harvested everything I could, but that's the point that it worsened. I was using the worm poop for tomatoes, it is lower in nitrogen. (I learned that lesson from a hot pepper plant that took 8 months to grow flower buds) but does anyone think that bone meal would help?
Well anyways thanks for all your feedback! Let's hope they were just resting : )

If you have planted them in a compost-rich soil environment that should be all they need, in my experience. Not every single female fruit succeeds. It is a numbers game.