Amphitornus, Melanopus, and Xanthippus spp.
Pest description and crop damage Nymph and adult grasshoppers can be a problem at seedling emergence. During years of high populations, grasshoppers migrate into emerging stands and devour the cotyledons. Damage is usually limited to the field margins, but total stand loss there can occur. An economic threshold of 7 to 12 grasshoppers per square meter is recommended.
Management-Chemical control (Foliar Treatment)
- Beauveria bassiana GHA (Mycotrol ESO, Mycotrol ES, BioCers WP, BotaniGard ES and BoteGHA ES) at 0.50 to 2 quart (0.014 to 0.054 lb ai/A) /100 gal of spray volume, (unless BioCers WP 1.5 lb to 3 lb of product (0.2 to 0.6 lb ai/A) /100 gal of spray volume).. Apply at 5- to 10-day intervals. High insect populations may require 2- to 5-day intervals. This product may be applied up to the day of harvest. REI 4 hr. Mycotrol ESO contains live spores of the naturally occurring fungus Beauveria bassiana Strain GHA. Spores are alive and may be harmed by storage at high temperatures or contact with water for more than 24 hr. OMRI-listed for organic use.
- bifenthrin (Tundra EC, others) at 0.033 to 0.04 lb ai/A or 2.1 to 2.6 fl oz/A. Do not exceed 0.08 lb ai/A or 5.12 ounces of formulated product per acre per season. Apply a minimum of 10 gal/A by ground or 2 gal minimum by air. Do not apply within 35 days of harvest. Do not apply less than 14 days apart.
- bifenthrin; zeta-cypermethrin (Hero Insecticide, others) at 0.04 to 0.053 lb ai/A. Do not exceed 5.5 oz per application. Do not apply more than 11 oz of product per season. Do not apply within 35 days of harvest. Do not make applications less than 14 days apart. Apply a minimum of 10 gal water by ground and 2 gal by air.
- chlorantraniliprole, lambda-cyhalothrin (Besiege) at 0.049 to 0.098 lb ai/A or 5.0 to 10.0 fl oz/A. PHI 21 days. Do not exceed a total of 28.0 fl oz of Besiege or 0.09 lb ai of lambda-cyhalothrin-containing products or 0.2 lb ai of chlorantraniliprole-containing products per acre per year. Make no more than 4 applications per acre per crop. Only use non-ionic surfactant (NIS).
- deltamethrin (Delta Gold) at 0.009 lb ai/A or 0.8 fl oz/A. Do not apply more than 1.5 fl oz of Delta Gold per acre on canola in one growing season. Allow 7 days between applications. Do not apply within 7 days of harvest. When applying by air, apply a minimum of 2 gal water per acre and 5 gal water by ground.
- gamma-cyhalothrin (Declare) at 0.0075 to 0.015 lb ai/A or 0.77 to 1.54 fl oz/A. PHI 7 days. Minimum interval between applications 5 days. Do not apply more than 0.045 lb ai per acre per season. Do not apply within 7 days of harvest. When applying by air, apply a minimum of 2 gal water per acre.
- lambda-cyhalothrin (LambdaStar Plus) at 0.015 to 0.03 lb ai/A or 0.96 to 1.92 fl oz./A. Do not apply within 7 days of harvest. Do not apply more than 0.09 lb ai (0.36 pint) per acre per year. Apply a minimum of 10 gal per acre for ground applications or 2 gal per acre for air applications.
- pyrethrins, piperonyl butoxide (Pyronyl Crop Spray) at 0.004 to 0.050 lb ai/A or 1 to 12 fl oz/A. Designed as a pre-harvest spray when other materials cannot be used due to PHI restrictions.
- zeta-cypermethrin (Mustang) at 4.3 fl oz/A or 0.05 lb ai/A. PHI 7 days. Do not apply more than 25.8 oz of product or 0.3 lb of active ingredient per acre per season. Do not make applications less than 7 days apart.
Management-chemical control (Seed Treatment)
- clothianidin (Poncho 600, others). Seed treatment. Apply at 3.84 fl oz/100 lb seed for low-to-moderate insect pressure, 5.12 fl oz/100 lb seed for moderate pressure and 10.23 fl oz/100 lb seed under high-to-extreme insect pressure. Do not apply more than 0.2 lb of active ingredient clothianidin per acre per year.