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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…
Insects
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While economic levels of damage have not been reported anywhere yet this year, individual fields could experience isolated high numbers… -
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,… -
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… -
Three thrips species will feed on canola in Canada and only one — western flower thrips, (Frankliniella occidentalis) — causes pod curling… -
You may find quite menagerie of insects in your net after 10 sweeps. Can you correctly identify these five?…
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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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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… -
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…
