Diamondback moth

  • Three insects to look for on canola pods

    Diamondback moth

    The three most common pod munchers are bertha armyworm, diamondback moth larvae and lygus bugs. Hot spots can sometimes be isolated to specific fields, so check each field. Before spraying, make sure insects counts are at or above economic thresholds. Applications made when insect numbers are below thresholds will not provide a positive return on investment and can do unnecessary harm to the many beneficial insects that help keep pest insect populations low.

    READ MORE

  • Diamondback moth larvae observed

    Diamondback moth

    Diamondback moth larvae are at noticeable levels in many canola fields in the Eastern and southern Interlake areas of Manitoba. But levels are generally below the economic threshold.

    READ MORE

  • Insect update: Bertha, diamondback and weevil counts

    Diamondback moth

    Insect trap counts are generally low across the Prairies, but bertha counts keep rising. Here are the latest provincial survey results.

    READ MORE

  • Map of the Week – wind trajectories

    Diamondback moth

    Of particular interest are those trajectories that, prior to their arrival in Canada, originated over northwestern and southern USA and Mexico – anywhere diamondback moth populations overwinter and adults are actively migrating.

    READ MORE

  • Canola Watch quiz: Diamondback moth

    Diamondback moth

    Test your diamondback management skills with these four questions…

    READ MORE

  • Diamondback moth larvae: Common questions

    Diamondback moth

    Diamondback moth larvae have been found in canola fields across the Prairies this year. Of those fields with the larvae, counts in many (perhaps most) are below and often well below thresholds. Some fields are at thresholds. Some fields seem to be well above thresholds. The key is to the check each field. Diamondback larvae can vary in number from field to field and even within areas of a field. (Photo credit: John Gavloski)

    Here are answers to common questions….

    READ MORE

  • Keep watch for diamondback moth larvae

    Diamondback moth

    Diamondback moth larvae have been found in many fields this year. In most cases counts have been well below economic thresholds, but keep looking just in case. Some fields are at thresholds and a few have been sprayed.

    READ MORE

  • Insects: Cutworm guide, DBM monitoring

    Diamondback moth

    AAFC has published a new cutworm guide, available as a free download, with descriptions of all pest cutworms in Canada as well as helpful management tips, including this excerpt from the scouting section….

    READ MORE

  • Why so few insects this year?

    Diamondback moth

    Pod-eating insects — including bertha armyworm, lygus and diamondback moth larvae — are at low levels in general in 2016. The biggest factors regulating insect populations are (1) weather, (2) natural enemies and (3) competing food sources. Each is working in favour of lower insect pest pressure this year.

    READ MORE

  • Diamondback moth larvae — Thresholds

    Diamondback moth

    Diamondback moth larvae feeding on pods.

    Thresholds for diamondback moth larvae are 100-150 larvae per square metre in immature to flowering plants and 200-300 larvae per square metre (20-30 per square foot) in plants with flowers and pods.

    READ MORE

  • ID green worms accurately

    Diamondback moth

    Before spraying, make sure your canola is at the right stage to be damaged by the worms and that the worms are actually the species you’re trying to control. Here’s how to tell the difference….

    READ MORE

  • Insect scouting: What may you find?

    Diamondback moth

    Lygus bugs make an appearance at canolaPALOOZA.

    Lygus is one insect you may find in canola this week, but spraying lygus before pod stages rarely provides an economic benefit. Lygus do most of their damage at the pod stages.

    READ MORE

  • Insect update: Swede midge, diamondback, flea beetles, lygus

    Diamondback moth

    Flea beetles on canola pod.

    Flea beetles have been observed in high numbers in some fields. Adults emerge from pupae in August and overwinter to feed on young canola seedlings the following spring. These same adults do feed now, but are rarely an economic concern because high numbers tend to be concentrated.

    READ MORE

  • Insect update: Check to be sure

    Diamondback moth

    Grasshoppers stripped this canola bare in a field near Medstead, SK. But while this looks dramatic, just a few plants were damaged and spraying was not required. Photo credit: Amanda Wuchner

    Diamondback moth larvae and grasshoppers have been reported, but so far nothing of widespread significance. The photo shows what grasshoppers can do to a canola plant, but their damage is usually isolated to small patches. Bertha armyworm adult traps are coming down with very little in the way of hotspots.

    READ MORE

  • Assess the real cause of bud loss in pre-bolting canola

    Diamondback moth

    Insects tend to damage only a few buds per cluster. If all are damage, something other than insects is the likely cause.

    Bud damage and insects are being found together in some canola fields, but that does not mean insects are the primary reason for the damage. Take a moment to assess the damage before making unnecessary or poorly timed insecticide applications. Key points to consider….

    READ MORE

Canola Watch