CRS degree day updates 2026
Biofix: March 1, 2026; First generation crawler emergence: April 15, 2026; Second generation flight: May 24, 2026; Second geneation crawlwers: 21 June.
As of June 21, 2026, Fresno County has accumulated approximately 1633 degree days (base 53°F) since the March 1 biofix for California red scale. This indicates that second generation crawlers have started to emerge, as the population DD is close to ~1650 DD. The third generation flight is expected near 2200DD (mid-to late July). Orchards using mating disruption should already have dispensers in place Management should follow UC IPM guidelines, with field-by-field monitoring due to variability in microclimate and pest development across Fresno County orchards.
For more information on DD on previous seasons and 30-year average data,
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Individual field conditions may vary. Monitor Individual fields. For treatment recommendations UCIPM Guidelines for citrus