Back to Wyoming Grasshopper Maps
1944-96 Grasshopper Outbreak Frequency Map
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1944-49 Grasshopper Outbreak Frequency Map
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1950-59 Grasshopper Outbreak Frequency Map
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1960-69 Grasshopper Outbreak Frequency Map
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1970-79 Grasshopper Outbreak Frequency Map
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1980-89 Grasshopper Outbreak Frequency Map
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1990-96 Grasshopper Outbreak Frequency Map
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Spatial distribution map for the years when less
than 300,000 ha were infested |
Spatial distribution
for map the years when more than 1,000,000 ha were infested |
Region
definition map |
Infestation collapse 1966-67
map |
Infestation collapse 1968-69 map |
Infestation
collapse 1975-76 map |
Infestation collapse 1987-88 map |
Infestation
collapse 1988-89 map |
Infestation expansion
1962-63 map |
Infestation expansion 1971-72
map |
Infestation expansion 1973-74 map
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Infestation expansion 1978-79 map |
Infestation
expansion 1986-87 map
Fig. 11. Spatial distribution of rangeland grasshopper outbreaks during
1987-1988, when infestation area decreased by 95.8% from the previous year
(dark shading = uninfested area; blue = area infested in 1987 only; yellow
= area infested in 1988 only; green = area infested both years; black =
state and county borders).