July 23, 2014 – Issue 16

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  • Four the week

    Pre-swath disease scouting

    Distinguished pests. CCC agronomists launch a new video (embedded above) this week with tips and helpful images for your pre-harvest disease scouting routine.

    Who ya gonna call? More tank mixes and more time stress create all sorts of scenarios for crop-damaging mistakes. Hopefully the two parties can figure out the problem and resolve this situation amicably. If not, a consulting agrologist might help.

    Nein-1-1. A decision to apply a rescue treatment for hail or heat requires two things: (1) Realistic expectations that an economic return may not occur and (2) acceptance that sufficient independent research on boron or any other rescue treatment hasn’t been done.

    Bloomin’ long. Canola with low plant populations will flower longer. With rain or humidity and a long time at “full flower,” is a second fungicide or a late first fungicide now worthwhile? Assess the situation and the tolerance for risk.


  • Map of the week

    Temperatures above 28C
    Temp legend

    The areas in orange and red have had the most days with maximum temperatures of 28°C or above in July. These hot days can cause higher levels of flower abortion, especially if they come in combination with warm nights. Areas in light green have had 2 to 4 days with maximum temperatures of 28°C or more, and dark green areas have had fewer than 2, which would be considered good news on the heat front for those regions.

    Thanks to Trevor Hadwen at AAFC for creating this map from their data.


  • July 23 Quiz

    Mystery question

    We have three questions on insects plus a mystery question (shown in the photo above). We don’t know what this is, and we’re hoping you might.


  • Video: Begin your pre-harvest disease watch

    Pre-swath disease scouting

    Yield-robbing levels of disease will be easy to spot in canola fields now and through to harvest. This is a great time to start your pre-harvest disease scouting. The CCC has released a new pre-swath disease scouting video available on www.canolacouncil.org on proper identification including tips and close up views of typical damage from the major diseases.


  • Tank hang ups and spraying mishaps

    Spraying mishap

    When strange patterns of damage in canola fields line up perfectly with the sprayer boom width or follow typical drift patterns, phone calls and finger pointing begin.

    Explanations can be simple: The wrong product was added to the tank, or the right product was applied but on the wrong field.

    But situations are often much more complicated — and made even more so by the wide variety of products that go through sprayer tanks. Mixing order becomes a potential problem, with unforeseen consequences if new never-used-before mixes are tried or if the proper mixing order is messed up or if products are not given time to come into suspension before the next product goes in.


Rescue treatment for heat, hailed crop

    Hail damage at mid to late flower can result in high yield losses. If trying a rescue treatment, check that there is leaf area to take up the treatment, and that the crop has any chance of recovery.

    Heat at flowering and hail at late flowering and podding can be highly damaging to yield. Lost pods are yield that cannot be recovered, and hail that knocks back a crop at this stage often doesn’t give the crop enough time to compensate and produce a good crop before fall frost. Growers often look for rescue treatments to revive the crop and save what’s there, but nothing is proven to work consistently.


  • Fungicide for late and long-flowering crops

    Fungicide applied late in the window can provide valuable protection from sclerotinia stem rot if flowering is extended or if conditions become more conducive to disease.

    The risk of sclerotinia stem rot infection is still present on later crops that have not reached full flower, especially given the rain and high humidity in some regions this week. Highly variable crops may also be at “full flower” or their “most yellow” — other terms for 50% flower — for longer than typically expected, which also extends the risk.


  • How late can you top dress?

    This graph shows nutrient uptake for canola. Having fertilizer in the root zone before peak uptake is the goal.

    Sulphur and nitrogen deficiencies are showing up in some canola crops. The crop may not have received enough fertilizer to begin with, especially if this year’s rates did not compensate for high yields and high removal last year. Excess moisture may have added to nutrient losses.

    Flowering is not an ideal time to top dress, and applications any time after early flowering may not provide an economic benefit. Late fertilizer needs to be applied to the soil surface and get a rain to move it into the root zone quickly for any chance of an economic benefit this year.


Canola Watch