CDFA Pest Prevention Plant Regulation Practice Exam

Under the black stem rust quarantine, which one of the following is NOT a regulated product?

1. A. Mahonia

2. B. Oregon grape

3. C. Mahonia cuttings for decorative purposes

4. D. barberry

The correct answer is: C. Mahonia cuttings for decorative purposes

The correct response indicates that Mahonia cuttings for decorative purposes are not considered a regulated product under the black stem rust quarantine. This is important because the black stem rust, caused by the fungus Puccinia graminis, primarily targets certain plants, notably wheat and other grain crops, but also has implications for specific ornamental plants. Regulation efforts typically focus on plants that are known to be hosts for the disease or those that could potentially harbor the spores and contribute to the spread of the rust. Mahonia and Oregon grape are indeed closely associated with possible infection and dispersal of the pathogen, making them regulated products in a quarantine setting. Barberry, as another host plant for black stem rust, is also subjected to regulations due to its role in the disease cycle. In contrast, when it comes to Mahonia cuttings specifically for decorative purposes, the context suggests that such cuttings may not present the same risk in terms of disease spread, given their intended use and possibly the conditions under which they are maintained. Consequently, they are not classified under the same stringent quarantine regulations as the other plants listed.