Kristen - Since your local Master Gardeners are more familiar with the insects and diseases in your area, you can call their hotline. Here is the contact info: UCCE Placer County 11477 E Avenue Auburn, CA 95603 Main Office: (530) 889-7385 MG Hotline: (530) 889-7388 email: ceplacer@ucdavis.edu Their website is:
http://pcmg.ucanr.org/ Good luck!