Canola Watch – July 26, 2017

July 26, 2017

CANOLA WATCH QUIZ: LATE-SEASON SPRAYING

Following labels and application rules are always important. A big reason for the rules is to prevent residues on harvested grain. These three questions provide a quick primer.

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KEEP WATCH FOR DIAMONDBACK MOTH LARVAE

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.

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TOP 10 THINGS TO DO BETWEEN NOW AND HARVEST

1. Keep an eye out for insects. The can help with identifying pest and beneficial insects. Pod damage from insects, including lygus, bertha armyworm and diamondback moth larvae, tends to be the most costly damage at this time of year. That’s because plants well into pod stage are getting out of flowering — and once flowering is done, the plant can’t compensate for lost pods. If spraying is necessary, choose a product with a pre-harvest interval in line with when you expect to cut the crop.

For the other 9…

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HAIL ON PODS

The later hail occurs in the season, the more damage it can do to yield. While canola can keep flowering to compensate from hail that occurs during flowering, hail at the late pod stage can result in unrecoverable yield loss. (The damage to the pod in this photo is minor but could still affect yield if seeds are damaged or disease sets in.)

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WHAT CAN YOU DO WITH LODGED CANOLA?

1. Green and bendable canola stems can often straighten up again (somewhat) if lodged due to wind and heavy rain.
2. If lodged due to disease, these plants are unlikely to straighten up. Plants lodged this early due to disease usually contribute little to yield once harvest rolls around.
3. Lodged plants can be more susceptible to spread of sclerotinia stem rot and alternaria from plant to plant.
4. Lodging can influence harvest management decisions, including whether to swath or straight combine the crop.

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JULY 26: SHORTS

Does rain at flowering change the sclerotinia risk and economic return from a fungicide? It could if (1) it results in a dramatic increase in yield potential, (2) if it happens at early flowering so the disease has enough time to cause yield-robbing levels of infection (and the fungicide window is still open) and (3) […]

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GRASSHOPPERS THRIVE IN HOT, DRY CONDITIONS

Grasshoppers can thrive in hot weather. The nominal threshold for grasshoppers in canola is 8-12 per square meter, although the higher end of that range may be more appropriate in a typical canola crop.

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