Usually watermelons that aren't pollinated turn yellow and drop much like an
unpollinated squash or zucchini would. How big do they grow before they rot?
If it's more like 1/4 to 1/2 size, then you're probably talking blossom-end
rot much like tomatoes and many other fruit suffer when calcium levels are
low. You might try spraying with some dilute calcium nitrate and lime your
soil this winter for next year. Excess water may also play a part as we seem
to get more of this in watermelons in wet years than dry ones.

"junkyardcat" wrote in message
...
We got a late start on our watermelons, but alas, they are starting to
grow
pretty fast. We have noticed that about half of them are rotting on one
end...way before they're ready to harvest Is this some kind of disease?
Or
too much water? Is there any way to stop this from affecting the whole
crop?
I notice it's only on the Carolina Gray variety...the Moon and Stars
melons
are doing great so far (knock on wood)...

Thanks for any help This is our first year to try growing watermelon.

Angie