August 15, 2012 – Issue 25

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  • Issues of the week

    As part of the spray decision for late-season insects, scout to determine if numbers are above economic thresholds, but also examine the crop development and insect stage and condition closely. Estimate time to swathing and consider whether insects are still feeding effectively on plant parts that will be significant contributors to yield. Always follow pre-harvest […]


  • Quantify late-season insect threats

    In parts of central Alberta, lygus counts continue to exceed thresholds significantly (with counts as high as 450 lygus in 10 sweeps in some fields). In other areas, lygus numbers are just at or approaching threshold but the crop is very near to swathing. With these counts, growers are encouraged to resist the urge to simply spray and to be vigilant when scouting for lygus. Some insect species (eg. bertha armyworm) can decimate a crop if left uncontrolled, but


  • Photo quiz of the week

    What has killed this bertha armyworm?


  • Begin evaluating the year that was

    Scouting at swath timing is a good time of year to begin assessing the growing season and begin planning for next year. In Manitoba, earliest harvested fields are not yielding to expectations. Take this opportunity to try and identify what might be at play leading to disappointing yields. Mother Nature’s environmental challenges played an important role in many cases but


  • Yield estimate before harvest

    Rather than focus on how many blank pods may be present, concentrate on yield assessment by examining the components that contribute to yield (ie. number of plants in a given area, number of pods per plant, number of seeds within the pods). The following equation can be used to estimate yield when seed size has a thousand kernel weight of 4.4 grams:

    Yield estimate (bu/acre) =


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