That's caused by a calcium deficiency. Agricultural gypsum(a.k.a. land plaster) is the remedy. Put at least a quart to each plant and work it into the soil good. The growing season is shorter up your way than down here so it may not have time to take effect this year. Next season get it out as soon as possible BEFORE the plants start blossoming. In fact spread it over the entire garden plot if you like, it's good for everything. It's a must for growing peanuts, they won't make without it.
As for keeping the rabbits and other critters from eating all your produce milorganite does the trick. Available at any well stocked feed and seed store. Sometimes sold under the name ''shake away''.