University of
Nebraska
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of Entomology

Insecticides for Control of Webworm of Sugarbeets

Updated March 12, 2003 by Gary Hein and John Thomas

Economic Threshold:
Detection of developing populations can lead to prevention of the rapid defoliation of sugarbeets by the larger larvae. Scouting for the early signs of an infestation is important. Insecticide control would be warranted if significant defoliation (> 15%) has occurred and larvae are still actively feeding.

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.

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IRAC Mode of Action Classification:
  • Group 1 = Acetylcholine esterase inhibitors; 1A = Carbamates, 1B = Organophosphates
  • Group 3 = Sodium channel modulators
  • Group 11 = Microbial distuptors of insect midgut membranes (includes transgenic crops expressing Bacillus); 11B1 = B. t. subsp. aizawai, 11B2 = B. t. subsp. kurstaki
R = Restricted-Use Product * = Suitable for chemigation ai = active ingredient REI = Re-Entry Interval
PHI = Pre harvest interval
Mode of
Action
Product
Name
Common
Name
Rate
Formulation/Acre
(unless otherwise noted)
Restrictions/Comments

3 R Asana XL* esfenvalerate 5.8 - 9.6 oz Do not exceed 0.15 lb ai/A per season. PHI 21 days. REI 12 hrs.
11B2 R Biobit HP,
Dipel
(multiple formulations)
Bacillus thuringiensis
(kurstaki)
see label for rates May be applied up to and on the day of harvest. REI 4 hrs.
1B R Declare,
Methyl 4EC
methyl parathion 0.5 - 0.75 pt PHI 20 days. REI 5 days.
11B1 R XenTari Bacillus thuringiensis
(aizawai)
0.5 - 1 lb No harvest interval. REI 4 hrs.
1A R Lannate SP, LV methomyl SP: 0.25 - 1 lb
LV: 0.75 - 3 pts
Do not apply within 7 days of harvest. REI 48 hrs.
1B R Lorsban 4E* chlorpyrifos 1 - 2 pts PHI 30 days. REI 24 hrs.
3 R Mustang 1.5 zeta-cypermethrin 2.4 - 4.3 oz PHI 50 days. REI 12 hrs.
1A Sevin*
(multiple formulations)
Carbaryl 4L
carbaryl 1 - 1.5 lbs ai
See label for rates
PHI 28 days. REI 12 hrs.

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