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In respect to this, do deer eat green tomatoes?
While deer are often a welcome sight, it's never a good thing to discover the tops of your precious tomato plants (Solanum lycopersicum) and their fruits eaten because of them. Deer will eat almost any foliage they can get when they're really hungry, and your tomato plants are no exception.
Also, how do you keep critters from eating your tomatoes?
Repellant sprays, such as those made of chili peppers, can help keep squirrels off your tomatoes. You could choose a commercially available spray or make one at home. If you're using a homemade, food-safe chili pepper spray, you can apply it directly to your developing tomatoes to deter hungry critters.
Deer, birds, squirrels and raccoons all eat tomatoes (Lycopersicon esculentum), but they rarely eat an entire fruit. Instead, they take a bite or two out of each one, ruining the entire crop for you.