There are certain plants that catch diseases. I leave all greens and
all root crops and all bulbs in place, because they never catch
anything, but tomatoes, cucurbita, beans and cabbage, if I know I am
not going to rotate next year, I prefer to remove. Most of my tomatoes
are healthy, but there is one particular heirloom that is hit or miss.
And the cukes get the wilt.
Otherwise it is efficient to harvest the vegetable, clean it on the
spot, and drop the remains on the ground. It saves you a trip to the
compost pile, and trip back.
Other things I have learned: absolutely mulch at the very last minute
before planting, and preferrably after last frost. If you mulch in
march, because you don't have much else to do, you will have cold soil