Because we can’t see the entire tree we’re assuming your tree is an apple tree, but it could also be a crabapple. Both are from the same plant family and are closely related. So regardless of which tree you have, you have a critter inside the fruit! We’re not familiar with a fruit tree pest that is bright orange. We recommend that you take your infected fruit and branch to either a local nursery or to the Colorado Extension Office. Because they can visually inspect the leaf, they can confirm the identity of your tree and hopefully your orange bug and provide you with some suggestions for control. Here’s a link to your local Extension Office – http://www.denverext.colostate.edu/
The most common pest for apples is the Coddling Moth. Their larvae which is found in the apple can be a light pink color. Here’s a link to the Colorado Extension Agency for more information on Coddling Moths – http://www.ext.colostate.edu/pubs/insect/05613.html
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