Hi diegogt,

Welcome to the Gardener's Forum. There are many "Californios" here.

What kind of grass do you have?
Tall Fescue? St. Augustine?

Knowing the kind of grass in your lawn will narrow down the type of lawn pest.

Here's a link to UC Davis IPM on lawn insects.

http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7476.html

Scroll to table 2 and click on Army Worms and Fiery Skipper to see if they are similar to the ones in your lawn.

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Amor est vitae essentia.
Love is the essence of life.