Citrus leafminer arrived from Mexico in 2000 and has been gradually working its way northward since that time. Citrus leafminer is known to infest Imperial, San Diego, Riverside, Orange, San Bernardino, Los Angeles, Ventura, Santa Barbara, San Luis Obispo, Kern, Tulare and Fresno Counties in California.
Distribution of Citrus Leafminer in the San Joaquin Valley 2006

Detailed Distribution of Citrus Leafminer in California 2000-2003
Sections infested in 2000
Sections infested in 2001
Sections infested in 2002
Sections infested in 2003