Yellow witchweed - Alectra vogelii
EEffective: April 24, 2015
Resources:
Pest Tracker
CAPS Pest Datasheet
Screening Aids:
Taxonomic Position:
Lamiales : Scrophulariaceae
Pest Type:
Plants
Pest Code (NAPIS):
PEUAZBA
This pest is a member of the following lists:
| Soybean |
|---|
These Approved Methods are appropriate for:
2024, 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016
Major Hosts identified in the Host Matrix:
Cowpea; Soybean
This list includes important economic or environmental hosts but does not represent all major hosts of the pest. Check CAPS pest datasheet for complete list of hosts.
This list includes important economic or environmental hosts but does not represent all major hosts of the pest. Check CAPS pest datasheet for complete list of hosts.
Pest is vectored by:
No known vector.
Survey
Approved Method(s):
| Method | Instructions | NAPIS Survey Method |
|---|---|---|
| Visual | Collect suspect plants. See the visual inspection excerpt from the guidelines. |
3031 - General Visual Observation |
Survey Instruction Details:
Because seeds are very small and could easily be transported on gear or clothing, samples should be collected carefully and double-bagged, and all gear and clothing should be cleaned to prevent introduction of weed seeds to new fields by surveyors.
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 Diagnostics
ID/Diagnostic: Morphological
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:
This weed can be confused for other Striga species and symptoms on host plants are similar to 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.