(Peter asked about corn gluten as a weed suppressant.) Misha already ably
covered the powdery mildew topic pretty well so I wont go there- unless Peter
can prevent humidity in Virginia in the summer!
You didnt say what kinds of weeds were problematic, but other growers in the mid
atlantic region have had succes using rye & rye mixtures as a winter cover, then
killing it by mowing or spraying before no-tilling tomato or melon transplants
into the resulting mulch. Rye residue has good weed suppressing effect. The
cover might have the added benefit of keeping your pumpkins cleaner as well.
Check out the cover crops website:
http://metalab.unc.edu/farming-connection/covercro/groff/groffhom.htm
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