. Agri-news. Agriculture. Grasshopper Risk - 2001 Alberta's Grasshopper Risk for 2001 map, outlining the risk potential of hopper out-breaks throughout the province, is available. Hie map. generated by Dr. Lloyd Johnson at Agriculture and Agri-Food Canada's Lethbridge Research Centre, uses data collected by fieldmen in over 1700 Alberta townships. "Grasshoppers thrive in dry weather. It's no surprise that this year's threat of hopper outbreaks is rated as moderate to severe across practically 80 per cent of Alberta's agricultural production area," says Jim Calpas, provincial integrat
. Agri-news. Agriculture. Grasshopper Risk - 2001 Alberta's Grasshopper Risk for 2001 map, outlining the risk potential of hopper out-breaks throughout the province, is available. Hie map. generated by Dr. Lloyd Johnson at Agriculture and Agri-Food Canada's Lethbridge Research Centre, uses data collected by fieldmen in over 1700 Alberta townships. "Grasshoppers thrive in dry weather. It's no surprise that this year's threat of hopper outbreaks is rated as moderate to severe across practically 80 per cent of Alberta's agricultural production area," says Jim Calpas, provincial integrated pest management specialist, with Alberta Agriculture, Food and Rural Development's pest prevention and management unit, Edmonton. "In fact, when the grasshopper risk map is placed over precipitation maps, the potential for moderate to severe hopper outbreaks matches with the areas that have received less than 60 per cent of their average precipitation. The greatest threat is in areas that have received less than 40 per cent of average ; Producers facing severe risk include an area around Smoky Lake, Vegreville and Vermilion; further south in the area northeast of Lethbridge bordered by Nanton, Fort Macleod and Taber; and the Milk River and Warner area. "The largest area at high risk for a severe hopper outbreak is in central Alberta in a line from Red Deer, Strathmore to Brooks running east to the border and into Saskatchewan," adds Calpas. "The area in the middle, bordered by Castor, Drumheller, Hussar to Oyen is rated at very severe risk from ; Producers are advised to monitor their fields and roadsides for grasshoppers. The economic thresholds for control are reached when hopper numbers exceed 13 hoppers per square meter in the field and 25 per square meter in the roadside. However, the economic thresholds are reduced when plants are under drought stress and arc unable to compensate for any feeding injury. Significant cr
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