2017 Grasshopper Forecast

The risk of economically significant grasshopper populations in 2017 has decreased in all areas of Alberta with the exception of southern Alberta. Significant populations still exist in some areas, notably Special Areas 2, Vulcan and Willow Creek (and northern Lethbridge) counties. Grasshopper populations in Forty Mile and Cypress and the rest of Alberta have collapsed with the heavy rainfalls of 2016. For this forecast to translate into grasshopper problems requires conditions favorable to grasshoppers as they hatch in the spring of 2017. Areas indicated with moderate to severe risk could experience problems with grasshoppers if environmental conditions favor the hatching and development of grasshoppers in late May through June. Localized factors such as light soils or south facing slopes result in an elevated risk of grasshopper infestations. Conditions in late spring 2017 will determine the extent of the grasshopper problems later this growing season. Infestation levels in individual fields are NOT indicated in this 2017 Grasshopper Forecast Map.

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The 2017 grasshopper forecast map is based on adult grasshoppers counts conducted in early August of 2016 by participating Agriculture Fieldmen across the province. These adult counts give an indication of the number of adults at the end of the season that are capable of reproduction and egg laying. Environmental factors can result in higher or lower actual populations than forecast. Individual producers need to be aware of the potential risks in their area and monitor fields in order to be prepared to make the appropriate decisions to implement control measures.

Two stripe grasshopper on canola Shelley Barkley, Alberta Agriculture and Forestry

Clearwing grasshopper Hind leg removed so wing markings are noticeable Shelley Barkley, Alberta Agriculture and Forestry

On individual farms, particular attention should be paid to areas that traditionally have higher grasshopper populations. In addition, grasshoppers tend to lay their eggs near areas of green growth in the fall that will provide potential food sources for emerging young the following spring. Areas with early green plant growth such as field margins, fence-lines and roadsides are also areas that will give early indications of potential grasshopper problems.

If insecticides are needed, note label precautions regarding user safety, proper application techniques and instructions to reduce impacts on non-target organisms. It is important to remember that control measures are intended to protect the crops from economic damage and are never successful in totally eliminating grasshopper populations.

Alberta Agriculture and Forestry acknowledges the commitment and support of the Agriculture Fieldmen across the province in conducting the surveys essential to the creation of this forecast. This survey was coordinated by Alberta Insect Pest Monitoring Network Staff, Alberta Agriculture and Forestry. The data management for this survey was done by Jan Lepp of Alberta Agriculture and Forestry.

Printable version of the grasshopper map.

Economic threshold information for grasshoppers.

Frequently Asked Questions

Grasshoppers: Lifecycle, Damage Assessment and Management Strategy