Q. I know you recommend bark mulches around trees to help
in water retention. However, there are negatives to consider such as
cockroaches, bugs, etc. I encounter lots
of cockroaches in the ground when I have excavated in certain areas of our yard.
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| Untreated wood chip mulch including pine needles and leaves |
Benefits of wood chip mulch
You are absolutely right. Insects
such as cockroaches are scavengers. Like many insects they like two things;
water and a food source. This is why you frequently see tons of them inside
irrigation boxes.
They feed on plants and animal life that have died and help in its decomposition. Feeding on dead and animal life helps return organic life back to the soil.
Cockroaches do not discriminate between dead plant or animal life whether it is inside the home or outside the home. They will enter the home if given the opportunity.
Using a foundation spray
Using a foundation spray or
pesticide around the perimeter of the home and in valve boxes helps to keep
them from entering our home. This is an insecticide spray barrier applied to
the outside of the home at soil level and 12 inches above the soil. A good time
to make this application is when temperatures begin to cool in the fall.
Looks like you misstyped in the first paragraph of your answer meaning Wood mulches decompose
ReplyDeleteRight you are! I corrected it and it now reads correctly. Thank you!
DeleteI too am a huge believer in the benefits of wood chip mulch in the arid desert home yard. I would hate to see anyone not practice this important method to improve their soil through increased moisture retention and water infiltration, increase air space, increase available carbon and nitrogen, lower salts, root cooling, lower soil compaction, decreased need for fertilizer and others I am forgetting.
ReplyDeleteSo I recommend increasing the barriers for cockroaches must pass through to get inside your home. I installed security doors on my home and besides that purpose it noticeably both lowered my electricity and gas costs (presumably it kept wind from forcing its way inside) and dramatically reduced the insects found within my home.
While I find cockroach nymphs inside my house fairly frequently say three times a week, I doubt I see more than one adult every three months. A puff from the bug spray kills them within 20 minutes.
There are other methods (see links below). Remember bugs generally do not want to be inside your home any more than you want them there. It is a foreign environment to them. Sometimes it is appealing because it is cooler or warmer than outside, but most of the time it is an accidental exploration that is not working out to well for either party.
Also remember if you kill of their predators you will see an increased presence of roaches including within the home. I remember when I was in high school I once went out at night and killed every black widow I found all around the home's foundation. About three dozen all together; hanging in their web transfixed in my flashlight unaware the impending smash of my thong. They were all dead withing five nights. Roaches and crickets invaded the house like never before within a couple of weeks.
Cockroaches: The Environmentally Friendly Pest Control Series—No. 1
http://www.unce.unr.edu/publications/files/nr/2000/sp0007.pdf
How to bug-proof your home:
http://extension.arizona.edu/pubs/az1320.pdf
Cockroach Management
http://ag.arizona.edu/urbanipm/buglist/cockroaches.pdf
Identification of Common Landscape Pests and Beneficial Organisms in Nevada
http://www.unce.unr.edu/publications/files/ag/2006/sp0608.pdf
I mostly find rol-y pol-ys (pill bugs) in my wood mulch. My biggest concern, though, is whether or not it's a fire hazard. It's kept away from the foundation of our home, but with a "postage-stamp" back-yard orchard, I'm never sure if 15-20 feet is far enough. I tend to wet it all down during July fireworks, for instance...
ReplyDelete