Three light brown apple moths, an agricultural pest, have been found in Arroyo Grande.
Agricultural officials have set out additional traps in an effort to determine the extent of the infestation. A quarantine of approximately nine square miles has been put into place.
The quarantine restricts the movement of certain plants, fruits, vegetables and green waste out of the area of infestation.
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The moth is native to Australia and can damage hundreds of species of plants including native plants, ornamental and food crops. The caterpillar stage of the insect can destroy, stunt or deform young seedlings, spoil the appearance of ornamental plants and can injure citrus, grapes and fruit crops.