In Trimming the Trees (Part 2) I discussed some of the specifics of pruning trees. At this point, my trees are all pruned. However, there is still work to be done. For one thing, this is the time of year when I examine the trees for egg masses of the Eastern Tent Caterpillar. Despite what you may have heard, repeated infestations will definitely kill a fruit tree, especially if the infestation is severe enough. It only makes sense. If you remove all of the leaves from a tree that only gets one set of leaves per season, the tree can’t store energy for the winter months.
Our experience has been that they’re a nuisance with apple trees. Yes, the tent caterpillars will cause a problem, but if you get in there and squish all of the caterpillars in the tent (or better yet, get rid of those egg masses in the spring), the apple hardly notices. However, plum trees seem to attract tent caterpillars like magnets. All four of our plum trees were in danger from dying at one point because we simply couldn’t keep the caterpillars under control. I told my friend about my problem with the plum trees and he said I should work with someone like The Local Tree Experts or at the very least get their perspective on how to manage this problem so we could enjoy our plum trees again. They had some useful advice from what I hear. Trying a few sprays was the first suggestion.
We did try a number of sprays-all of which proved ineffective. Spaying the trees with a dormant oil spray in the spring helps only a little. By far the best strategy is to hunt down the egg clusters and destroy them. The secondary strategy is to look for the tents absolutely every day in the spring and summer after the trees have leafed out and destroy them by individually squishing the caterpillars by hand. We actually had two of our plum trees stripped of leaves in a single day by these pests.
While we’re looking for tent caterpillar egg clusters, we also look for other problems in the trees, such as disease, insect infestations, and so on. It’s easier to find problems after you’ve pruned the trees and there are fewer branches to check. Taking time now to check the trees will save you a lot of effort later.
Of course, now we have a pile of branches to deal with. This year we pruned our pear trees heavily because they’ve become a little overgrown. If pear trees get too overgrown, they’ll tend to prune themselves in heavy winds-usually not in a way you would have chosen. The pile of branches from all of our trees is quite high this year.
We’ll put all of these branches through the chipper and then use them for mulch. A lot of people would probably burn the branches up, but using them for mulch does save at least some money. I’ve been trying to figure out the environmental balance in this case. On the one hand, burning the branches would produce a lot of particulate smoke that would pollute the air for at least a while. However, using the chipper also produces pollutants, and some of those pollutants are harsher on the environment than the smoke from burning would cause.
If we had burned the branches, I would have placed the pile in the middle of the garden. That way we could have plowed the ashes into the ground where they would have provided fertilizer on top of the winter rye you can see growing in the background of the picture. So, either way, the branches wouldn’t have gone to waste. However, we really need the mulch more than the ashes, so we’re creating the mulch.
Our orchard is ready for spring at this point. Let me know about your tree pruning and bug eradication experiences at [email protected].