I agree with Al that you should remove any dead or dying limbs. As to the cause, it is almost certainly the hail, either directly or indirectly. No tree likes having its bark riddled with holes, and this weakens the tree and leaves the door open to disease as well. I had the same thing last year, but in August, which I think was worse because the plants tried putting out new growth like it was spring, only to be hit down again with the first hard freeze in the fall. Long story short, I did lose one of my three apricot trees, a 4-year-old volunteer from seed that was very vigorous and had already produced some fruit. Slower growing trees I think handle these things better. Good luck

Here's a trick: make a sling out of something that won't stay wet, like a nylon stocking or onion sack; tie the sling to the trellis. The sling will bear the weight of the melon. You don't need to do this until the watermelon is a bit larger.... maybe the size of an orange. This works for anything that will get large. BUT... Is your trellis strong enough to carry the weight?

Could you post picture of the 2 trees and the fruit. Are these trees grafted or grown from seed. Are the trees of the same variety kumquat, EX Meiwa & Meiwa Nagami & Nagami. If you have a Meiwa & a Nagami they will taste very different from one another. If your trees are from seed, I would like to know your secret on seed grown kumquat trees. Steve If you are interested in seeing my seed grown meiwa kumquat click below & best of luck with your trees Here is a link that might be useful: https://plus.google.com/photos/111099372377958308731/albums/5967653232333283409/5972084004664102114?banner=pwa&pid=5972084004664102114&oid=111099372377958308731

Check to see if you have male and female flowers on the vine. The female flowers have the immature fruit behind them...if they aren't pollinated, the fruit turns brown and falls off. In general, vines produce female flowers before it begins to produce male ones, so it is possible you have one and not the other. It is also possible you have both but that you don't have the insect activity to pollinate the female flower. That is easily remedied...take a qtip (or even just your finger) and get some of the pollen from the male flower and transfer it to the center of the female flower. Good luck!