Lindcove Research and Extension Center
University of California
Lindcove Research and Extension Center

Fresno County DD

CRS degree days

Degree days as of August 31, 2022, Fresno County: 3366 DD. 4th generation flight is mid-way.
No. of males on 4th flight is used to make assessments for CRS infestation in the coming season.
Threshold: 1000 males/4th flight (conventional: 50 males/4th flight – if mating disruption is used).


Biofix: 1st male flight: March 15

Lower developmental threshold = 53°F

Degree days from first male flight to crawler emergence: 550 DD

2nd male flight: 1100 DD

2nd generation crawlers: 1650 DD

For updated information, click here

Individual field conditions may vary. Monitor Individual fields. For treatment recommendations UCIPM Guidelines for citrus

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