NEWA Update 6.6.19

What’s new?

Weir’s cushion rust was sporulating in Orange County in the end of May, I learned from Branching Out.  It’s a disease of spruce – we don’t have exact GDD for diseases since environment is so important.  More information at:


For those areas moving into the 600’s in GDD, Cryptomeria scale crawlers will becoming out (600-800).  They are sometimes hard to tell from elongate hemlock scale  – whose crawlers come out earlier 360-700.  It is important to know which one you have so you apply pesticides when they will work.


I’ve been reading pesticide labels – definitely not for fun!  I’m sure you have been frustrated with them.  The pest and the crop must both be on the label and looking at several Chlorothanlonil labels – they were all different!  Argggh!  If you have questions, I know who to ask at the Pesticide Management and Education Program.


Continuing –

Two spotted spider mite – 363-618 GDD

Gypsy moth larvae – 90-448 GDD

Douglas fir needle midge adults –  200-400 GDD

Pine needle scale crawlers – 298-448

Striped pine needle scale crawlers – 400-500

European pine sawfly larvae – 78-200

Introduced and red-headed pine sawfly larvae – 400-600

Zimmerman pine moth larvae– 121-246


The sun is out!  Hurray!


Have a great week!