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University of Nebraska–Lincoln

Insecticides for Control of Seed Weevils in Sunflower

Updated May 5, 2006 by Gary Hein and John Thomas

Economic Thresholds:

Confection:
Red Seed Weevil--- Begin to treat when plants have reached the R5.1 stage and one red seed weevil can be found per head.
Gray Seed Weevil---Begin to treat when plants have reached the R4 stage and one gray seed weevil can be found per bud.

Oilseed:
Use the treatment timings noted above in confection thresholds. Treatment thresholds will be similar for both the red and gray seed weevils and will range from 8 to 15 weevils per head depending on market price, cost of control and plant population. To more carefully evaluate these thresholds, see the following web site: http://ext.nodak.edu/extpubs/plantsci/pests/e1143w1.htm.

This list is not inclusive. See http://www.greenbook.net or other resources for additional registrations.
This information is presented in abbreviated form. Be sure to consult the label for additional information and restrictions.

IRAC Mode of Action Classification:
  • Group 1 = Acetylcholine esterase inhibitors; 1A = Carbamates, 1B = Organophosphates
  • Group 3 = Sodium channel modulators
R = Restricted-Use Product * = Suitable for chemigation ai = active ingredient REI = Re-Entry Interval

Mode of
Action		 Product
Name		 Common
Name		 Rate
(Formulation/Acre)		 Restrictions/Comments
3 R Asana XL* esfenvalerate 5.8 - 9.6 oz Do not apply within 28 days of harvest. REI 12 hrs.
3 R Baythroid 2* cyfluthrin 2 - 2.8 oz Do not apply within 30 days of harvest. REI 12 hrs.
1B R Methyl 4EC methyl parathion 2 pts Do not apply within 30 days of harvest. REI 5 days.
1B R Lorsban 4E,
Nufos 4E		 chlorpyrifos 1 - 1.5 pts Post-emergence treatment. Do not apply within 42 days of harvest. REI 24 hrs.
3 R Proaxis* gamma-cyhalothrin 2.56 - 3.84 oz Do not apply within 45 days of harvest. REI 24 hrs.
3 R Warrior,*
generics		 lambda-cyhalothrin 2.56 - 3.84 oz Do not apply within 45 days of harvest. REI 24 hrs.