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IPM Crop Survey for North Dakota |
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Grasshoppers
Other Links | Publications | Thresholds | Comments | Grasshopper Archives
Grasshopper counts reported by the survey are based on sweep net samples taken along field margins or in non-crop areas bordering fields. Survey scouts have been instructed to sample all crop sites visited, regardless of crop, since grasshoppers are a general plant feeder and could affect any of our North Dakota crops.
| SURVEY DATES | |||||||||||||
| GRASSHOPPERS | Animations | 5/19-5/30 | 6/2-6/6 | 6/9-6/13 | 6/16-6/20 | 6/23-6/27 | 6/30-7/4 | 7/7-7/11 | 7/14-7/18 | 7/21-7/25 | 7/28-8/1 | 8/4-8/15 | Season |
| Grasshoppers-Nymphs | Image | Image | Image | Image | Image | Image | Image | Image | Image | ||||
| Grasshoppers-Adults | Image | Image | Image | Image | Image | Image | |||||||
| Grasshoppers-Rangeland | Southwest
ND North Central ND |
Southwest
ND North Central ND |
Southwest
ND North Central ND |
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Other Links
Cereal Growth Stages-Zadoks Decimal Code
Publications
Grasshopper Biology and Management for North Dakota
Grasshopper
Information
Thresholds
Infestation Ratings
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Nymphs |
Adults
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| Rating | Margin | Field | Margin | Field |
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Light
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25-35
50-75 100-150 200+ |
15-23
30-45 60-90 120 |
10-20
21-40 41-80 80+ |
3-7
8-14 15-28 28+ |
In general, grasshopper populations classified as threatening are expected to cause crop damage and warrant treatment.
For more information, please contact:
Marcia McMullen, Plant
Pathologist, IPM Coordinator
mmcmulle@ndsuext.nodak.edu
Phil Glogoza, Entomologist
pglogoza@ndsuext.nodak.edu
Webmaster: Web_Master@ndsu.nodak.edu
This site was last updated August 19, 2003