OLR Timing

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⁾
Location	2004	2005	2006	2007	2008	2008 Treatment Window⁽¹⁾
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.

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