How to Manage Pests
UC Pest Management Guidelines
Small Grains
Grasshoppers
Scientific name: Melanoplus spp.
(Reviewed 2/07, updated 2/09, pesticides updated 7/16)
In this Guideline:
Grasshoppers may occasionally attack grain crops, particularly if planted adjacent to foothill rangeland. They normally migrate from the range into cultivated areas as vegetation on the rangeland dries up.
Grasshoppers destroy leaf tissue and, if present in extremely large numbers, they will consume the entire plant.
Management Decisions
Since most grasshopper problems begin outside the grain field, areas favorable to grasshopper development should be carefully monitored for build-up and control measures taken if necessary.
Common name |
Amount per acre |
REI‡ |
PHI‡ |
(Example trade name) |
|
(hours) |
(days) |
UPDATED: 7/16 |
|
The following are ranked with the pesticides having the greatest IPM value listed first&—the most effective and least harmful to natural enemies, honey bees, and the environment are at the top of the table. When choosing a pesticide, consider information relating to air and water quality, resistance management, and the pesticide's properties and application timing. Not all registered pesticides are listed. Always read the label of the product being used. |
|
A. |
DIMETHOATE |
|
(Dimethoate 4EC) |
0.75 pt |
48 |
35 |
|
MODE-OF-ACTION GROUP NUMBER1: 1B |
|
COMMENTS: For use on wheat and triticale only. Do not make more than two applications per year. Do not graze within 14 days. Highly toxic to bees; do not spray directly or allow to drift onto blooming crops or weeds where bees are foraging. |
|
B. |
MALATHION |
|
(Malathion 8) |
1 pt |
12 |
7 |
|
MODE-OF-ACTION GROUP NUMBER1: 1B |
|
COMMENTS: May be used on barley, oats, wheat, and rye. If alfalfa is in bloom, apply during the night or early in the morning when bees are not foraging in the field. Highly toxic to bees; do not spray directly or allow to drift onto blooming crops or weeds where bees are foraging. |
|
![[Precautions]](/IMAGES/btn-precautions_bul.gif)
UC IPM Pest Management Guidelines:
Small Grains
UC ANR Publication
3466
Insects and Mites
L. D. Godfrey, Entomology, UC Davis
V. M. Barlow, UC Cooperative Extension, Riverside County and UC IPM Program
Acknowledgment for contributions to Insects and Mites:
D. Gonzalez, Entomology, UC Riverside
C. G. Summers, Entomology, UC Davis/Kearney Agricultural Center, Parlier
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