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Man, SoCal is getting hammered.
They got so little rain this past winter composed to NorCal (and we didn't get as much as we really needed), I hate to think what the late summer and early fall will bring, especially when the Santa Ana winds act like a bellows to a furnace.
 
So what can happen when you run a mower in dry besides hitting rock and starting a fire? It could possibly leak gas and go poof like the one in the center of the bottom picture shrouded by smoke.
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More from the NASA Earth Observatory site. First, bark beetle caused tree loss in the Sierra Nevada mountains:
http://earthobservatory.nasa.gov/IOTD/view.php?id=88381

Then, so our eastern friends don't feel left out, gypsy moth caterpillar damage in Rhode Island. Check out the picture at the bottom of the page. The trees will survive unless this happens for several years in a row.
http://earthobservatory.nasa.gov/IOTD/view.php?id=88370
With defoliation, I think the rule of thumb is, if they survive 3 seasons they'll most likely survive.
 
With defoliation, I think the rule of thumb is, if they survive 3 seasons they'll most likely survive.

I hope you're right. I was noting info from this part of the article:
"The ecological consequences of gypsy moth outbreaks are often cosmetic, but they can become serious. Deciduous trees can normally withstand one or two years of defoliation by caterpillars, but three or more successive years of severe defoliation can result in widespread tree mortality. “Though weak or sick trees could succumb, we are not worried about significant tree mortality yet,” said Ricard."
 
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