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2008 Insect Forecasts | |
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| | Population monitoring depends on which insect species is being considered. Pheromone trap captures, eggs/other soil stages, adult populations in the preceding year, or recent population patterns are just a few methods that are utilized.
Bertha armyworm: Bertha armyworm (Mamestra configurata) was monitored in 2007 using a network of pheromone-baited traps placed throughout the prairie provinces. Pheromone traps are used to determine the density and distribution of moths. Traps set out this past summer showed that bertha armyworms were a potential problem in parts of Alberta. The projected population did not develop which leaves a large question mark going into the 2008 season. In season monitoring will once again be critical in assessing the risk of bertha armyworms in 2008.
2008 forecast based on 2007 map
Life cycle information
Diagnostic guide
Economic thresholds
Bertha monitoring cooperators
Cabbage seedpod weevil: The 2007 survey indicated a large population of cabbage seedpod weevil in southern Alberta. While this is not a true forecast, experience has shown us that the numbers of weevils found at most sites south of Hi-way 1 have the potential to result in economically damaging populations in the next growing season. This high population may, however, be impacted by the hot summer we experienced in 2007.
2008 forecast based on 2007 survey data
Life cycle information
FAQ
Grasshoppers: The risk of economically significant grasshopper populations in 2008 has increased dramatically in north-central Alberta and parts of the Peace region. The 2008 Alberta risk map for grasshoppers shows low populations through much of south central and southern Alberta.
2008 forecast based on 2007 survey data
Life cycle information
Grasshopper management
Economic thresholds
Grasshopper FAQ
Pea leaf weevil: The pea leaf weevil (Sitona lineatus L.) increased in both severity of damage and range in the past year. The 2007 survey was based on damage ratings in 65 fields (17 municipalities) carried out in late May.
2008 forecast based on 2007survey data
Life cycle information
Wheat Midge: The Alberta wheat midge forecast for 2008 shows a drastic increase in the range and intensity of wheat midge in Alberta. For the first year since Alberta started midge surveys the risk level is very high in large parts of central Alberta. This increase in wheat midge risk has also occurred in Saskatchewan. This forecast agrees with the Canadian Grain Commission harvest unload survey that looks at samples with midge damage noted in the grading.
2008 forecast and map
Life cycle information
Economic thresholds
FAQ
Diagnostic guide
Wheat Stem Sawfly: The area at risk of economically significant sawfly populations in 2008 will be much lower than in recent years. The 2007 field margin survey shows lower populations in most of the area surveyed. Several areas of southern Alberta still have populations that are high enough to fuel wheat stem sawfly resurgence if conditions are favorable.
2008 forecast and map
Life cycle information
Economic thresholds
FAQ |
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For more information about the content of this document, contact Scott Meers.
This document is maintained by Shelley Barkley.
This information published to the web on January 24, 2008.
Last Reviewed/Revised on December 22, 2011.
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