Updated December 20, 2011
Economic Thresholds:
| Grasshopper Population (Hoppers/Square Yard) |
Field | Field Margin |
Treatment necessary? |
| Non-economic | 0-2 | 5-10 | No |
| Light | 3-7 | 11-20 | Questionable, depends on size, species, type of crop |
| Moderate | 8-14 | 20-40 | Probably |
| Abundant | 15 or more | 41 or more | Yes |
For more information, see A Guide to Grasshopper Control in Cropland.
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: | ||||
|
||||
| Mode Of Action |
Product Name |
Common Name |
Rate (Formulation/Acre) |
Restrictions/Comments |
|---|---|---|---|---|
| 3 R | Asana XL |
esfenvalerate |
5.8-9.6 oz |
Lower rates may be used for smaller grasshoppers. Higher rates may be necessary to control large populations, or mature grasshoppers. |
| 3 R | Baythroid XL, |
cyfluthrin | 2.1-2.8 fl oz | PHI 21 days for grain or fodder. REI 12 hrs. |
| 3 R | Brigade 2EC, |
bifenthrin |
2.1-6.4 fl oz |
|
| 1B, 3 R | Cobalt | chlorpyrifos and |
7-13 fl oz | PHI 21 days for grain and 14 days for silage and grazing. |
| 3 R | Delta Gold | deltamethrin | 1.0-1.5 fl oz | PHI 21 days for grain or fodder and 12 days for grazing. REI is 12 hours. Highly toxic to bees. |
| 1B | Dimethoate 4EC |
dimethoate |
1 pt |
PHI 28 days for grain and 14 days for forage. |
| 3 R | Hero | zeta-cypermethrin |
2.6-6.1 fl oz | PHI 30 days for grain and 60 days for forage. REI 12 hours. |
| 1B R | Lorsban 4E, |
chlorpyrifos |
½-1 pt |
PHI 21 days. |
| 3 R | Mustang Max EC, |
zeta-cypermethrin |
2.72-4.0 fl oz |
Apply in a minimum of 2 gallons/acre by air and 10
gallons/acre by ground. |
| 1B R | Penncap-M |
methyl parathion |
2-3 pts |
Do not apply Penncap-M during pollen-shed if bees are foraging in the areas to be treated. |
| 3 R | Proaxis | gamma- |
2.56-3.84 fl oz | When applying by air, apply in a minimum of 2 gallons of water/acre. |
| 1B, 3 R | Stallion | chlorpyrifos + |
9.25-11.75 fl oz | PHI 30 days for grain or stover and 60 days for forage. |
| 3 R | Steed | zeta-cypermethrin |
3.5-4.7 fl oz | PHI 30 days for grain and 60 days for forage. |
| 3 R | Warrior w/ |
lambda-cyhalothrin | 2.56-3.84 fl oz | When applying by air, apply in a minimum of 2 gals of water/acre. |
| 3 R | Warrior II w/ |
lambda-cyhalothrin | 1.28-1.92 fl oz | |
