As many of you know, I had some terrible luck in my orchard this year- all my peach tree buds got frozen by a late freeze and then my neighbor let his 2, 4-D spray drift all over my orchard and killed many trees and most of those that survived at least lost their new growth and flowers. The point is, out of about 70 trees I have very, very few that have fruit this year (just a few apples).
I was trying to find a positive side to all this (its hard!) and was thinking that perhaps a year without fruit would cause a lot of my insect pests to either starve out or migrate else where or otherwise have their patterns disrupted to the point that there might be less pressure next year. I should tell you that before I started my orchard I had an existing peach, pear, and apple on the site which had been producing fruit for years, but had never been sprayed or harvested. So it was a perfect setting for pests like PC and OFM. They got to eat and live in the fruit until it fell to the ground and then crawl into ground. In other words, it was the perfect environment for such predatory insects. As a result, I sincerely believe that I have the worst case of PC and OFM many of you have ever seen. Last year I sprayed every 10 days and still had a lot of damage.
With all that background, let me (finally) get to my questions. First, what are your thoughts about whether or not one year without fruit will have any sort of positive impact on the OFM and PC populations?
Second, and this is my ecology question, can someone educate me a little bit on the life cycle of OFM and/or PC. One of those - and I am sorry, but I just can’t tell which one- is absolutely devouring my peach trees. Specifically, the very tips of every single branch-big or small- are wilting and dying. ALL OF THEM…Hundreds per tree. when I pluck the wilted tip off, I can carefully pull it open and there is always a tiny little maggot looking worm in there. Its either PC or OFM. I’ve looked at countless photos of both online and read ways to tell them apart, but I just can’t figure it out. Lets forget which one it is for a moment. I’m very curious about why they bore into the tips of branches and am hoping someone can explain that? With fruit, I understand that they bore to the seed, live there and feed until the fruit falls, then go into ground and continue life cycle. But why bore into the tips of branches? THey branches just dry out and hang there. And the larvae don’t ever go very far down in the branch. So it would seem to me that this behavior leads to their death. Its hard to understand why nature would program something to act against its best interest. Perhaps they can’t find fruit this year so they have no where else to bore. If that is the case, and if it does lead to their death, then it seems I might benefit greatly by not having fruit on any trees this year. I also must ad and admit that part of the problem is that I’ve been much less rigorous about spraying my trees this year since I have no fruit to protect. Seeing all these dead tips makes me think I should have kept a tight spray regimen. On the other hand, I’m not sure this is doing much damage in the long run since new tips form pretty quickly after the old one dies.
Thanks for any insight you can offer into the life of these critters and whether not having fruit for a year will have an appreciable effect. Sorry this was too long (as usual for me!)