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The latest information on crop management and agronomy issues in field and horticultural crops in Manitoba.
With the wet conditions and delayed harvest experienced in parts of Manitoba in fall 2016, very few farmers were able to complete their fall fertilization program. Since early seeding is important for optimizing crop yield, producers will be looking for ways to apply their N requirements efficiently without delaying the seeding operation. In addition, soil reserves of N are variable and margins between crop revenue and input costs are modest; therefore, optimizing nitrogen fertilizer use efficiency is important. To achieve these objectives for a spring fertilization program will require use of a 4R nutrient stewardship strategy: applying the right rate of the right fertilizer source, with the right placement and at the right time to minimize losses of fertilizer N to the environment and optimize the crop’s access to the fertilizer.
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Suspect weed escapes can be confirmed as resistant or susceptible by herbicide-resistance testing. For most weeds, dry, mature seed is required for the analysis. Although more is better, many labs require at least 100 g of small weed seeds (e.g. cleavers) and 200-250 g of large weed seeds (e.g. wild oat). Weed seed samples should be submitted by December 31, 2016 to either:
Biennial wormwood – Despite its name, biennial wormwood behaves like an annual in agricultural fields. When scouting, estimate the average growth stage of biennial wormwood populations in a field. If the majority of the plants have already set seed, a fall herbicide application won’t help. An application may be worthwhile only if there is a large flush of biennial wormwood that haven’t set seed and are less than ~3 inches tall. Herbicide tank-mixes containing glyphosate + group 4 are more effective than glyphosate + group 2 on this weed.Round-leaved mallow (RLM) – This annual weed can act as either a winter annual or a short-lived perennial, although it is more sensitive to freezing than our common winter annuals. Mild winters in 2015 & 2016 provided the right conditions for RLM to overwinter, allowing it to become (even more) problematic in certain fields over the last few growing seasons. Long range forecasters are predicting a harsh winter across the prairies this year, which should control RLM. However, if you have little faith in forecasts and decide to apply a herbicide, glyphosate mixed with either Distinct or DyVel DSp has activity on this weed.Stork’s bill – Like biennial wormwood, stork’s bill tends to be predominantly an annual in Manitoba. If this is a problem weed for you, scout affected fields to determine average weed stage. Again, if most of your stork’s bill has set seed you’re better off working on a plan for next year. Stork’s bill, especially larger plants, is relatively tolerant of many herbicides. If you decide to apply a herbicide because of stork’s bill this fall, glyphosate + group 2 or glyphosate + group 2 + group 4 on weeds up to the 4 to 6 leaf stage is probably your best bet.
Steps to obtaining a soil fumigation licence:
For more information on soil fumigation certification and licensing contact:
Anne Kirk, Pesticide Minor Use and Regulatory
Manitoba Agriculture, Food and Rural Development
Phone: (204) 745-5663 , Email: email@example.com