September 16 Quiz – Fall weed control

Jay Whetter September 16, 2015 Leave a Comment

Fall is an excellent time to control perennials and winter annuals, but a few key management steps can greatly improve the results. This quiz hits on a few highlights.

1. A fall glyphosate application is a very good way to control quackgrass. A light frost (-2°C or so) just before or application should not affect glyphosate performance on quackgrass as long as air temperatures return to ______ during the day.

0°C

at least 5°C

10°C

around 15°C

2. What one statement below is the key to post-harvest weed control? (Three of them are not good advice.)

Spray immediately after harvest. Earlier is always better.

Wait for sufficient regrowth to provide enough target leaf area for adequate uptake.

Wait for a heavy frost. A fall frost helps improve efficacy.

With the crop out of the way, lowest rates of glyphosate are suitable for fall weed control.

3. What is the best time of day to make a fall herbicide application?

At first morning light to beat the heat.

During the warmest part of the day, and sun helps.

In the evening after dew sets in and combining has to stop for the day.

At night.

4. This may seem counter-intuitive, but one of the best ways to manage volunteer canola in the fall is to _____________.

Do nothing.

Use tillage instead of herbicide.

Use glyphosate alone.

Burn the field.

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