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Alfalfa weevil is a concern in some alfalfa fields in the Eastern, Interlake and Central regions. Some producers have cut their alfalfa early as a means of managing the alfalfa weevil, others have used insecticides. The heaviest feeding occurs as mature larvae appear, usually mid-June through mid-July. Mature larvae are about ⅜ inch long, have a black head capsule and a wrinkled green body with a white stripe running lengthwise. A heavily infested alfalfa field will have a silvery appearance as the green material is eaten off the leaves by larvae. After larvae complete their development, they drop to the soil for pupation (non-feeding stage). The new generation of adult weevils emerge in 1-2 weeks and then overwinter in debris or alfalfa stubble.
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This spring on May 7, Lake Manitoba sits at 811 feet above sea level (FSL) on average between Westbourne and at Steep Rock. Water flows into Lake Manitoba through the Waterhen River are 2883 cubic feet per second (cfs) while outflows at Fairford are 1148 cfs. This has brought Lake Manitoba up slightly from 810.9 FSL earlier in the spring. The Assiniboine River at Portage is flowing at 447 cfs and the Whitemud River is at 81 cfs. All of these river flows are well below average for the spring. The Whitemud and Assiniboine rivers median flow for this time of year are 1000 and 5500 cfs respectively.
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Future snow and spring rain will determine Manitoba’s 2021 spring run-off and potential for high water situations across many of the province’s watersheds.
The Manitoba Hydrologic Forecast Centre’s mid-January basin conditions assessment indicates drier than normal conditions for much of the southern and central Manitoba basins. The Red, Souris, and Assiniboine river basins continue to receive below-average precipitation since August 2020. However, northern Manitoba basins, including the Churchill and Saskatchewan river basins, continue to receive average to above-average precipitation since July 2020.
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