RE: Roundup question
Pumpkins are fun for the kids - but not great for the deer.
There is a couple weeks a year when pumpkins appeal to deer - but its not a nutritional boost - and its tough to predict the "dessert value" for deer. If you are planting them for fun - plant after spraying.
If you really want to supplement the RR corn/bean plots for deer- you can broadcast winter wheat or rye into them in Late August or Sept. - OR - overseed with a clover for NEXT year - OR both.
FH