Degree days for California Red Scale and Citrus Peelminer are Posted
California red scale: The biofix for California red scale was March 11-25 for various areas of the San Joaquin Valley and degree days have been accumulating ever since. Kern County is always warmest and has reached the 550 dd 1st crawler emergence point. The other counties will reach that mark in the next two weeks. It has been an exceptionally warm spring and so we are about 50 degree days ahead of the 30 year average.
See my web page for Monday updates. http://ucanr.edu/sites/KACCitrusEntomology/Home/California_Red_Scale/Degree_Days_885/
Citrus peelminer: The biofix for Tulare County was on April 22 and that starts the degree day accumulation clock. Remember that the first two generations of citrus peelminer attack noncitrus hosts such as willows, walnuts etc. It isn't until the third generation that the peelminer starts to attack pummelos and grapefruit. We will keep you informed as to when those flights are occurring.
See my web page for Monday updates. http://ucanr.edu/sites/KACCitrusEntomology/Home/Citrus_Peelminer/Degree_Day_Calculations/