CCA - Certified Crop Advisor Weed Identification and Control Questions and Answers

Question 1

A CCA is scouting a field and finds a pigweed species with smooth, hairless stems and petioles that are consistently longer than the leaf blades.
Some leaves exhibit a faint, V-shaped watermark.
Which of the following weeds has been identified?

Accepted Answer

Palmer amaranth (Amaranthus palmeri)

Answer

Redroot pigweed (Amaranthus retroflexus)

Answer

Common waterhemp (Amaranthus tuberculatus)

Answer

Common lambsquarters (Chenopodium album)

Question 2

A post-emergence herbicide application results in severe twisting, cupping, and epinasty (downward bending of petioles) on susceptible broadleaf weeds. These symptoms are characteristic of which herbicide mode of action group?

Accepted Answer

Synthetic auxins (Group 4)

Answer

ALS inhibitors (Group 2)

Answer

PPO inhibitors (Group 14)

Answer

EPSP synthase inhibitors (Group 9)

Question 3

A producer has confirmed glyphosate-resistant (Group 9) common waterhemp in a no-till soybean field. Which of the following represents the MOST effective and sustainable management strategy?

Accepted Answer

Implement a program using a pre-emergence residual herbicide with a different effective mode of action, followed by a timely post-emergence application of another effective mode of action.

Answer

Increase the application rate of glyphosate and add a surfactant.

Answer

Rely solely on a post-emergence application of a PPO inhibitor (Group 14) herbicide.

Answer

Switch to intensive tillage to bury the weed seeds before planting.

Question 4

What is the primary function of a non-ionic surfactant (NIS) when added to a post-emergence herbicide spray mixture?

Accepted Answer

To reduce the surface tension of spray droplets, allowing for better spreading and coverage on the leaf surface.

Answer

To increase the pH of the water to prevent herbicide degradation.

Answer

To bind with hard water ions, increasing herbicide activity.

Answer

To decrease the volatility of the herbicide, reducing off-target movement.

Question 5

A grower is dealing with a heavy infestation of giant foxtail, a grass weed known for a prolonged germination window, in their cornfield. Which strategy provides the most effective, season-long control?

Accepted Answer

A layered program using a full rate of a pre-emergence residual herbicide at planting, followed by a timely post-emergence application as needed.

Answer

A single post-emergence application of a grass herbicide when the foxtail is 6 inches tall.

Answer

A burndown application of a non-selective herbicide one month before planting.

Answer

In-season cultivation with a row-crop cultivator two times during the season.

Question 6

Which weed life cycle is generally the most difficult to control and eradicate from a field, primarily due to its ability to reproduce vegetatively from extensive underground structures?

Accepted Answer

Creeping perennials

Answer

Summer annuals

Answer

Winter annuals

Answer

Biennials

A CCA is scouting a field and finds a pigweed species with smooth, hairless stems and petioles that are consistently longer than the leaf blades.Some leaves exhibit a faint, V-shaped watermark.Which of the following weeds has been identified?

A CCA is scouting a field and finds a pigweed species with smooth, hairless stems and petioles that are consistently longer than the leaf blades.
Some leaves exhibit a faint, V-shaped watermark.
Which of the following weeds has been identified?