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By early July, many canola fields throughout the Prairies are to start with phases of bolting. In accordance with Héctor Cárcamo, analysis scientist with Agriculture and Agri-Meals Canada at Lethbridge, Alta., that’s a good time to start out eager about the cabbage seed pod weevil.
Earlier than worrying about thresholds and spray timing for the insect pest that may be fairly detrimental to the ultimate yield, it’s essential to mud off the ol’ trusty sweep web, and see what is definitely on the market.
“Ensure you get inside the sector as a result of in the event you solely sweep the sides of the sector, you’re going to get a really inflated depend,” explains Cárcamo. “For instance, in the event you simply sweep the sector in a single spot, and you discover say 4 weevils per sweep; the edge is round three to 4 weevils. Now, in the event you transfer 50 meters into the sector, you can see solely half as many weevils.”
The additional time to get a whole image of the insect stress within the discipline is a small value to pay, in comparison with the 1000’s of {dollars} you would possibly spend spraying fields unnecessarily.
Take a look at the complete dialog between Carcamo and RealAgriculture’s Kara Oosterhuis, under:
Bolting often is the time to start scouting for the cabbage seed pod weevil, nonetheless, it’s not essentially time to resolve whether or not you’re spraying or not. Cárcamo recommends ready till you see the primary flower — after which ready a couple of week. If the temperature is common for that week, your crop will find yourself being at 20 per cent flowering — and that’s the time to start out eager about management, if warranted.
“Earlier than that point there’s a little bit of a danger that you could be spray too early, after which there could possibly be one other wave of bugs coming into your discipline. When you spray too late, then there’s a possible that the weevils would have already laid the eggs, as a result of they lay the eggs on small pods which are about one inch lengthy,” he explains. “So you actually have to consider the timing appropriately.”
Among the analysis that has been performed over time has proven that you may lose two to a few bushels per acre, so maintaining an eye fixed out for the insect can actually be price your time.
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