Hot Sauce or Capsaicin (pepper) is a taste repellent used in products like Hot Pepper Wax. They appear to work well with Squirrels and Rabbits and may work in some instances with Deer.

Putrescent (Rotten) Eggs is used as a scent and taste based repellent as an ingredient in many spray-on repellents.

Many people would use a two pronged approach to keeping deer away from your pumpkins and other plants. A spray on taste/odor repellent would be one strategy. Another very effective strategy is to use the Deer's keen sense of smell and strong survival instinct to your advantage.

Shake-Away Large Animal Repellent takes advantage of both of those Deer defense mechanisms. It is the only product that contains genuine Coyote Urine in granule form. Simply sprinkle the product directly on the ground around the area you want to protect. It may be the easiest and safest deer repellent to use and comes with a money back guarantee.

Here is a link that might be useful: Deer Repellent Granules

Oh my god! Deer-Eating Pumpkins?? Those poor deer!

The coyote urine only works well if you are in an area where coyote actually prey upon the deer. If not, they will not recognize the scent as a threat because they have never encountered it. Human hair, and urinating around the area might work. Msome swear by milorganite...it is composted human sewage waste... I have never used it, but some ppl swear that spreading it around the perimeter of their gardens helps deter a lot of critters including deer.