1. Our lawn is infested with grubs. Is it too late in the season to apply...
1. Our lawn is infested with grubs. Is it too late in the season to apply milky spore? 2. Is it too late to trim my roses a little bit?
Baltimore County Maryland
1. We do not recommend applying milky spore in general because the current produce is no longer as effective as it once was (many years ago.) This late in the season is also probably too late to apply other grub control products also, because when the temperatures really get cold, the grubs move far down in the soil and stop eating.
2. You can trim "a little bit" any time. The caution in autumn is that you do not want to prune so much that you stimulate new growth, which in turn does not have enough time to harden off and can be killed by winter temperatures. This wastes the plants energies.
Another caution with extensive fall pruning of roses is that the rose may suffer some winterkill in a harsh winter and, if a rose was already pruned hard in the fall, there might not be much left of it by spring!
But, like you said, you only want to prune "a little bit", so you should be fine.