Omnivorous Leafroller Treatment Timing

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Last Update: June 23, 2008

Next Update: March 2009 

Location

Bio-Fix Date

2008 Treatment Window(1)
2004

2005

2006 2007

2008

Fresno County
Kerman 3/15 3/15 4/10 3/14 3/18 May 13 to May 20
Madera County
Ripperdan 3/19 3/15 4/17 3/15 3/20 May 15 to May 21

(1) The treatment window of 700 - 900 degree-days is well established for "stomach poison" types of control materials (i.e.;  Kryolite®, etc.)  However, for IGR  type materials (i.e.; Confirm®, etc.) an earlier timing at about 500 degree-days may be considered.

Research work has shown that the most effective time to control Omnivorous Leafrollers (OLR) is between 700 to 900 degree-days after the first "biofix" date for each generation.  The first moth flight (biofix date) in the spring usually occurs in mid March.  The "treatment windows" are based on the biofix dates for each generation. Using the actual temperatures which have occurred to date, then assuming normal temperatures, the optimum treatment windows for OLR are shown above.
California AgQuest Consulting, Inc.
4545 N. Brawley Avenue
Fresno, CA  93722
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