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Results from the disease survey show increases in sclerotinia stem rot incidence. Blackleg incidence is down from 2015 in Manitoba and Saskatchewan and up in Alberta…
Pest survey results for 2016
December 9, 2016
Insects
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Bertha armyworm: A few warm spots
August 10, 2016
While economic levels of damage have not been reported anywhere yet this year, individual fields could experience isolated high numbers…
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Lygus thresholds: Good vs dry conditions
August 4, 2016
In dry conditions: Threshold tables for lygus indicate that if canola is $12 per bushel and spray costs $8 per acre, the threshold at the early pod stage is 5 lygus adults or late instar nymphs per 10 sweeps (0.5 per sweep). In moist and high-yield conditions: The economic threshold is likely quite a bit higher. At early pod stage,…
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Why so few insects this year?
July 27, 2016
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…
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Curled pods are usually thrips damage
July 27, 2016
Three thrips species will feed on canola in Canada and only one — western flower thrips, (Frankliniella occidentalis) — causes pod curling…
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July 20 Quiz — What's in your sweep net?
July 20, 2016
You may find quite menagerie of insects in your net after 10 sweeps. Can you correctly identify these five?…
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Lygus bugs: ID, scouting tips and thresholds
July 20, 2016
Lygus have piercing, sucking mouth parts, which they use to pierce pods and drain immature seeds. This is where the major yield loss occurs from lygus…
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Lygus: 3 main species
July 20, 2016
Three main lygus species are pests of canola in Canada. Colour and shape are somewhat different, but each should be counted equally when sweep netting and making spray decisions. This one is the most common, L. lineolaris…
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Aphids: They cluster like crazy but is spraying economical?
July 20, 2016
To answer the question, not likely. In most cases, only individual or small groups of plants are infested. The nominal threshold in canola is when 10-20% of plants have clusters…