Answer: Mulch should be renewed every year. Put the old mulch in your compost pile and use fresh leaves for mulch around your trees. It is true that mulch might harbor insects, but often these aren't pest insects. In general, if you find a insect damage, have an experienced gardener or extension agent help you determine if the damage is truly harmful (plants can stand quite a bit of damage before it affects their performance), and identify the critter. We can then help with solutions. Enjoy your new gardening experiences!
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