I have a carey too, about 10 years old now. Yours doesn't look too awful to me. For what it is worth, I assume some leaves will be fodder for the wee beasties, as long as the healthy untouched leaves far outnumber the munched upon ones I wouldn't worry.

may have been a hit and run caterpillar, doesnt look too alarming. mangos grow pretty effortlessly here after about a year in the ground, they dont really have a pest problem other than fungus anthracnose which copper can help during the wet season. Carrie is an excellent selection

Sorry, but the two issues are not at all the same!! Rick, your apple blossoms are just showing some weather damage......nothing to worry about and nothing to treat. Fwiw, a great many early blooming trees and shrubs will produce flowers that show this sort of damage....typically just the result of a heavy rainfall. We see this all the time in our wet PNW springs......and we grow a heck of a lot of apples here in WA state!!

That nest isn't big enough to deal with pest control. I do admit to calling them two years ago when 'out of the blue' one that was basketball sized appeared in a cherry. Hanging right over the circular drive exactly where one friend would typically park. Bald faced hornets (black and white, and large) One your size, I would knock loose. And probably very early in the morning when still cool out and they aren't especially active. If its in an agreeable (easy) spot, you could have a bucket of soapy water underneath to catch the nest in. I wouldn't even spray and risk burning foliage on my tree for that newly occurring nest. If someplace on my property (an acre) where they aren't threatening, I'll leave them. If later in the year they might be dangerous to people like my allergic mother, mail carrier, I'll remove. That pest control experience was expensive (like $160) but I couldn't muster up enthusiasm for going out in other than daylight hours, climbing a ladder, trying to take care of it. He came, suited up fully and netted his face and neck, brought his own ladder and sprayed immediately into the entrance with something he said was non toxic to other than the hornets who came into contact with it. He came the next day again for followup, and removed the nest then.