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: http://plantclinic.cornell.edu/factsheets/chrysomyxaweirii.pdf
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. https://extension.psu.edu/elongate-hemlock-scales https://extension.psu.edu/cryptomeria-scale
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.
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!