Cereals: Grasshoppers (Various species)


Pub 812: Field Crop Protection Guide > Chapter 4 : Forages > Grasshoppers

Field Crop Protection Guide 2011-2012, Order 2011-2012 publication

Table of Contents

  1. Description
  2. Integrated Pest Management Options
      • malathion – Malathion 500 EC
      • cypermethrin – Ripcord 400 EC
      • cyhalothrin-lambda – Matador 120 E, Silencer 120 EC
      • carbaryl – Sevin XLR Plus
      • spinetoram - Delegate WG
  3. Related links...

Description

There are several species of grasshopper that may attack forages. They vary in colour from green to brown. Nymphs look similar to adults but are smaller and have incomplete wings. Both stages feed by chewing. All species have enlarged hind legs for jumping.


Integrated Pest Management Options

Grasshoppers are more abundant in drier years. If populations are high enough, wheat heads may be clipped. Seedling winter wheat is also at risk. Infestations usually begin along field borders. Early-season weed control can help eliminate food source for early-season nymphs, however, late-season weed control in and around the field will actually cause this insect to migrate from the weeds onto the crop and cause damage. If populations are high, spot spray in border areas that are infested before migration into the field occurs.

 
Active ingredient malathion
Trade name Malathion 500 EC
Rate per hectare (product) 2.25-2.75 L per ha
Rate per acre (product) 900-1,100 mL per ac
PHI* 7
Comments Product is less effective at temperatures below 20°C (68°F).

 

 
Active ingredient cypermethrin
Trade name Ripcord 400 EC
Rate per hectare (product) 50-70 mL per ha
Rate per acre (product) 20-28 mL per ac
PHI* 30 (wheat) 45 (barley)
Comments For use in wheat and barley. Ground application only. Use lower rates for small grasshoppers and when soil temperatures are cool (15°C-20°C or 59°F–68°F). Avoid spraying when temperatures are above 25°C (77°F). Repeat treatment as necessary. Do not graze treated crop or cut for hay.

 

 
Active ingredient cyhalothrin-lambda
Trade name Matador 120 E
Rate per hectare (product) 63-83 mL per ha
Rate per acre (product) 26-34 mL per ac
PHI* 28 (wheat, barley, oat) 14 (livestock foraging)
Comments Ground and aerial application. Apply the low rate when grasshoppers are up to the 3rd nymphal stage (up to 1 cm in length) or when insect numbers are low. Apply the high rate when grasshoppers are larger, up to but not including winged adults (up to 2.5 cm in length) or when insect numbers are high. Allow a 7-day interval between treatments. Maximum 3 applications/yr. Do not apply more than 2 applications by air. 24-hr re-entry period.

 

 
Active ingredient cyhalothrin-lambda
Trade name Silencer 120 EC
Rate per hectare (product) 63-83 mL per ha
Rate per acre (product) 26-34 mL per ac
PHI* 28 (wheat, barley, oat) 14 (livestock foraging)
Comments Ground and aerial application. Apply the low rate when grasshoppers are up to the 3rd nymphal stage (up to 1 cm in length) or when insect numbers are low. Apply the high rate when grasshoppers are larger, up to but not including winged adults (up to 2.5 cm in length) or when insect numbers are high. Allow a 7-day interval between treatments. Maximum 3 applications/yr. Do not apply more than 2 applications by air. 24-hr re-entry period.

 

 
Active ingredient carbaryl
Trade name Sevin XLR Plus
Rate per hectare (product) 1.25-2.5 L per ha
Rate per acre (product) 0.5-1.0 L per ac
PHI* 14 (wheat, rye, oat) 28 (barley)
Comments See label precautions applying to honeybees.

 

Active ingredient spinetoram
Trade name Delegate WG
Rate per hectare (product) 100–200 g per ha
Rate per acre (product) 40–80 mg per ac
PHI* 21
Comments Ground application only. Minimum of 5 days between applications. Spray tank solution pH should be between 6 and 8 for optimal control. Maximum 3 applications/yr. 12-hr re-entry period.

 


Related links...

 

 


For more information:
Toll Free: 1-877-424-1300
E-mail: ag.info.omafra@ontario.ca
Author: OMAFRA Staff
Creation Date: 2 May 2011
Last Reviewed: 13 May 2011