Kill the squirrels (live traps or pellet gun).
Roof rats live in trees
The secretive, nocturnal nature of rats means that they often go unnoticed in a neighborhood until dooryard citrus and other fruit starts to ripen. They then make their presence known with a vengeance. In citrus, papaya, cantaloupe, and watermelon the characteristic damage is a circular hole about the size of a quarter or half dollar and the whole fruit hollowed out
As we progress through the citrus season (from September through March), the roof rats that may have been living quietly around your house or grove make themselves known. Hollowed-out fruit is the most common evidence of roof rats.
In apples, peaches, tomatoes, carambolas, bananas, pineapples, and mangos, large sections of fruit are eaten away. They remove whole fruits from blueberries, figs, grapes, strawberries, lichees, Surinam cherry, loquat, and dates, so the damage is less noticeable or birds are blamed for the missing fruit. In Florida, roof rats—along with our native cotton rat—destroy or damage a great deal of sugar cane every year.
Nothing like having a good cat
I'm innocent I tell you it' was my little friend