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Pine bark mulch saves water and reduces weeds, but it can cause problems. Mulch reduces weeds by blocking light from the soil below, preventing seeds from sprouting. Mulch also helps to keep soil moist and moderate its temperature. Pine bark mulch is an inexpensive organic product that gradually decomposes, adding humus to the soil and giving it a loose, crumbly texture.
Pine bark beetles live under the bark of pine trees. Adults infest new trees by chewing through the outer bark, leav-ing small round holes in the bark that may ooze pine resin (called âpitch tubesâ). Adult pine bark beetles create tun-nels or galleries under the bark where they mate and lay eggs.