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Scouting for bertha armyworm can be tricky when scouting during the heat of the day. Click here to view a short scouting video with Canola Council Agronomist Tiffany Martinka. It……
Need to spray insects this late?
August 9, 2012
Bertha armyworm
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Spray berthas in the evening
August 1, 2012
On hot days, bertha armyworms take shelter low in the canopy or on the ground under leaf litter. This is not a good time to scout or spray. Bertha armyworms feed more actively on cooler days and in evenings. This is the time to spray. When scouting, include all worms larger than half an inch long in threshold counts. Smaller…
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Insect update: Lygus, bertha
July 25, 2012
Second generation lygus have arrived. Young nymphs will reach late instar and adult stages in 5 to 14 days. When scouting to see if lygus numbers are near thresholds, include later instars — the ones with black dots on their back — as well as adults in the count. Bertha armyworm larvae are starting to feed in some locations…
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Lots of green worms. What are they?
July 25, 2012
Some fields may have a variety of green worms feeding, including bertha armyworm, diamondback moth larvae, imported cabbageworm and alfalfa looper. Here's how to tell them apart…
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Insects: Lygus, bertha, zebra caterpillars
July 18, 2012
Include nymphs (shown above) when doing lygus sweep net counts. Bertha risk rising. Zebra caterpillers are usually confined to small areas within a field. (Photo source: Roy Ellis)…
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Insects: Leafhoppers, berthas, blister beetles, cutworms
July 11, 2012
Leafhoppers are more plentiful and carrying more aster yellows phytoplasm this year, but spraying is rarely effective. Bertha counts are starting to spike in some locations. Cutworms are still feeding in some locations, but the threat should be over for most regions…
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Insect update: Lygus, bertha, leaf hopper
July 6, 2012
Check to see if lygus feeding is preventing crop from coming into flower. Bertha armyworm adults are mounting and larvae will start to hatch later this month. Leafhoppers are at higher than usual numbers in some locations…
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Insect update: diamondback, weevil, cutworm, bertha, beneficials
June 27, 2012
Probably too early to spray cabbage seedpod weevil, diamondback continue feeding, bertha moth numbers are high in some regions, cutworms near the end but still active, and always think about those valuable beneficials — like those helpful killers, the lady bugs…
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Insect update: leaf rollers, wireworms, bertha, flea beetles
June 20, 2012
Leaf rollers probably aren't worth controlling. Wireworms will live up to 4 years as a larvae and will feed on canola. Bertha monitoring begins. Flea beetles numbers are falling for the season…