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
- Description
- 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
- 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...
