University of
Nebraska |
 |
Department
of Entomology |
Insecticides for Greenbug Control in Sorghum
Updated October 20, 2003 by ZB Mayo
Economic Thresholds:
| Seedling (0-5 leaves) | Treat if greenbug colonies are present on 10-20 percent of plants, and visible yellowing or spotting on leaves is present. |
| Plants 6 inches tall to boot | Treat if greenbug colonies are beginning to cause red or yellow leaf spotting on lower leaves of most plants AND parasite numbers are low (less than 20 percent of greenbugs parasitized). |
| Boot to heading | Treat if greenbug colonies are present on most plants, and have killed one lower leaf,and if parasite numbers are low (less than 20 percent of greenbugs parasitized). |
| Heading to hard dough | Treat if greenbug colonies are present on most plants and have killed two normal-sized leaves, and if parasite numbers are low (less than 20 percent of greenbugs are parasitized.) |
For information on biology and management of greenbugs, consult NebGuide G87-838,
Management of Greenbugs
in Sorghum.
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 4 = Nicotinic acetylcholine receptor agonists/antagonists; 4A = Neonicotinoids
R = Restricted-Use Product |
|
At Planting |
Mode of
Action |
Product
Name |
Common
Name |
Rate
(Formulation) |
Restrictions/Comments |
|
| 4A |
Cruiser (Adage) 5FS
seed treatment |
thiamethoxam |
5.1 fl oz per cwt |
Purchase treated seed from seed dealers. There is a 120 day plant-back
interval for soybeans and corn. |
| 1A R |
Furadan 4 F
("24-C") |
carbofuran |
2.5 oz/1000 row ft |
Apply directly into seed furrow using 7-20 gallons per acre spray volume. |
| 4A |
Gaucho
seed treatment |
imidacloprid |
8.0 oz/cwt of seed |
Purchase treated seed from seed dealers. There is a 30 day plant-back
interval for soybeans and corn. |
| 1B R |
Thimet 20 G |
phorate |
6 oz/1000 row ft |
Place granules in a 7-inch band over the row at planting and incorporate
into the soil. Do not apply directly on the seed. |
|
Post-Emergence |
Mode of
Action |
Product
Name |
Common
Name |
Rate
(Formulation) |
Restrictions/Comments |
|
| 1B |
Dimethoate 4 EC |
dimethoate |
0.5 - 1.0 pt/acre |
Apply in 25-40 gallons of water per acre for ground application and
in one or more gallons if applied by air. May apply up to 3 applications
per year but do not apply after heading. |
| 1A R |
Furadan 4 F
("24-C") |
carbofuran |
0.5 - 1.0 pt/acre |
Apply in sufficient water to obtain thorough coverage. Do not make more
than 2 foliar applications per season or apply after heads emerge. Do
not graze treated fields or cut for silage or forage within 30 days following
treatment. |
| 1B R |
Lorsban 4 E |
chlorpyrifos |
0.5 - 1.0 pt/acre |
Apply in sufficient water to obtain thorough coverage. Do not apply
more than 3 pints of Lorsban per acre in one season. Treated crop cannot
be used for grain, forage, fodder, hay or silage within 30 days after
treated with one pint per acre or for 60 days for applications of more
than one pint per acre. |
| 1B |
Malathion 57 EC |
malathion |
1.5 pts/acre |
Apply in sufficient water to obtain thorough coverage and repeat application
if needed. |
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