Omnivorous Leafroller Treatment Timing

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Last Update: July 6, 2009

Next Update: March 2010 

Location

Bio-Fix Date- Second Flight

 2009 Treatment Window(1, 2 & 3)

2009
Fresno County 500oDs 700oDs 900oDs 1200oDs
Parlier 5/22 6/12 6/20 6/28 7/8
Fowler 5/25 6/15 6/23 6/30 7/11
Laton 6/5 6/27 7/4 7/11 7/21
Mendota 5/28 6/18 6/26 7/2 7/13

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

(2) The bio-fix dates and degree-day calculations are taken directly from the weekly "Sticky Notes" web publication which can be found at: www.ipm2go.com/PestReports. This web page provides information for a number of pests including Omnivorous Leafroller.

(3) Based on the second bio-fix date, the third flight bio-fix would occur at 1,200 degree-days.
 
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.
 
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4545 N. Brawley Avenue
Fresno, CA  93722
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