I had 80 fruits on my harvester peach tree. My first havest - thanks Growingfruit.org! I attempted to put clemson bags on approximstely half of them. I spayed permethrin at petal fall and again 10 days later. I sprayed bonide infuse 10 days after petal fall. At that point the shuck had already split on a lot of the fruitlets. I began bagging at about 2 weeks after petal fall and thinned while i bagged over a week long period or so.
I checked each peach for larvae and brown rot at harvest. Here are the final numbers:
Bagged: 1/37 had second generation plum curculio larvae.
Nonbagged: 17/43 had 2nd gen pc larvae.
I saw one instance of brown rot and it was on an nonbagged fruit. I saw no damage from first gen pc larvae. The fruits with pc were still mostly edible after cutting out the bad parts. Id say only a 20% loss of flesh on average.
The other thing worth noting is about 20% of fruits regardless of bag treatment had flesh breakdown, but no rot, in a very small cylinder at the bottom tip of the fruit. Kind of like it got overripe way too soon in that area. Maybe something physiological?
I also have a flame prince peach tree treated exactly the same. It ripens in a few weeks so fruit are just starting to swell. I can see that unbagged fruits are getting hammered by pc and maybe stink bugs. My eyeball says it will be 100% of nonbagged ones, and its bad enough that they wont be edible. Not sure what is going on inside the bags because i have not taken the time to peek inside yet.