June 8, 2012 – Alert 2

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  • Diamondback larvae near thresholds in some canola

    Add diamondback moth larvae to your early season scouting list. Growers cannot expect insecticide seed treatment to protect canola from diamondback moth larvae, so spraying may be necessary in some fields or parts of fields.

    Before spraying, make sure that:
    1. Large areas within the field have reached the nominal threshold of 25% or more of the leaf area lost. (See photos below.)
    2. Diamondback larvae are still present.
    3. They are actively feeding. (Many diamondback moth larvae may have started to cocoon and are no longer a threat.)
    4. Newest leaves are being eaten. If the newest leaves are in good shape, the crop will probably grow through the threat.

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Canola Watch