Yellow witchweed - Alectra vogelii
Effective: April 24, 2015
Taxonomic Position: Lamiales : Scrophulariaceae
Pest Type: Plants
Pest Code (NAPIS): PEUAZBA
This pest is a member of the following surveys: Soybean
These Approved Methods are appropriate for: 2024, 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016
Pest Information
CAPS Pest Datasheet: https://download.ceris.purdue.edu/file/3134
Pest Tracker: https://pesttracker.org/pest/PEUAZBA
Hosts Identified in the CAPS Host Matrix:
Cowpea; Soybean
Pest is vectored by:
No known vector.
Survey
Approved Method(s)
| Method | Detail | NAPIS Survey Method |
|---|---|---|
| Visual | Collect suspect plants. See the visual inspection excerpt from the guidelines. | 3031 - General Visual Observation |
Survey Recommendations
The following are recommendations for executing the survey using the approved methods for pest surveillance. The recommendations are developed through literature review and consultation with subject matter experts.
Signs:
Roots are bright orange below soil surface. Stems and leaves are conspicuously hairy. The dust-like seeds are covered with indentations.
Symptoms:
Stunted crop plants with smaller leaf area, shorter leaf petioles, and increased shoot/root ratios.
Key Diagnostic or Identification
Approved Method(s)
ID/Diagnostic:
Morphological: Characteristics of the flowers, leaves, seeds, and roots can be used to distinguish A. vogelii.
The Federally Noxious Weeds Disseminules of the U.S. provides keys and fact sheets that can help identify seeds of Federally Noxious Weeds, including Alectra spp. (Scher and Walters, 2015).
The Federally Noxious Weeds Disseminules of the U.S. provides keys and fact sheets that can help identify seeds of Federally Noxious Weeds, including Alectra spp. (Scher and Walters, 2015).
Mistaken Identities:
Other Striga species and nutrient deficiencies.
Notes:
Send to an approved botanist for identification.
References
- Scher, J. L. and D. S. Walters. 2015. Federal Noxious Weed Disseminules of the U.S., Edition 2.2. California Department of Food and Agriculture, and USDA APHIS Identification Technology Program.
- Scher, J. L. and D. S. Walters. 2015. Federal Noxious Weed Disseminules of the U.S., Edition 2.2. California Department of Food and Agriculture, and USDA APHIS Identification Technology Program. Alectra Fact Sheet.
If you are unable to find a reference, contact STCAPS@usda.gov. See the CAPS Pest Datasheet for all references.