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Soybean Rust Scouting and Sample Submission

Soybean Rust Scouting and Sample Submission. Pathogens: Phakopsora pachyrhizi Phakopsora meibomiae Favorable environment Long periods of leaf wetness Moderate temperatures (59-77°F) High relative humidity (75-80%). Soybean Rust Scouting and Sample Submission.

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Soybean Rust Scouting and Sample Submission

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  1. Soybean RustScouting and Sample Submission • Pathogens: • Phakopsora pachyrhizi • Phakopsora meibomiae • Favorable environment • Long periods of leaf wetness • Moderate temperatures (59-77°F) • High relative humidity (75-80%)

  2. Soybean RustScouting and Sample Submission • Hosts potentially found in Wisconsin: • Soybean (Glycine max) • Snap/kidney bean (Phaseolus vulgaris) • Pea (Pisum sativum) • Yellow sweetclover (Melilotus officinalis) • White clover (Trifolium incarnatum) • Purple crownvetch (Cornilla varia) • Winter vetch (Vicia villosa)

  3. Soybean RustScouting and Sample Submission • Hosts potentially found in Wisconsin: • Lupine (Lupinus spp.) • Ticktrefoil (Desmodium spp.) • American bird’s-foot trefoil (Lotus unifoliolatus) • Crimson clover (Trifolium incarnatum) • Korean clover (Kummerowia stipulacea) • Chinese lespedeza (Lespedeza cuneata) • Rattlebox (Crotalaria spp.)

  4. Soybean RustScouting and Sample Submission • Tips for scouting • Concentrate efforts on known hosts (particularly soybean), but be willing to check other legumes for the disease. • Check leaves in the lower canopy first, but be aware that upper leaves can become infected too. • The more leaves you examine, the more likely you will find the disease.

  5. Soybean RustScouting and Sample Submission • Sample collection and submission • See UW-Extension Pest Alert XGT1001 for details. • DO NOT be bashful about sending in samples. • Submit a representative set of leaves (or other plant parts) showing a range of symptoms. • Collect and submit detailed information on the location from which the sample was collected. • Sandwich the plant materials between paper towels and cardboard.

  6. Soybean RustScouting and Sample Submission • Sample collection and submission • Double bag the sample. • Keep the sample cool prior to shipping. • Ship the sample to the PDDC by overnight mail if possible in a sturdy, leak-proof box. • Include a completed copy of the “Soybean Rust Submission Form”. • If possible, call the PDDC to let staff know that a sample is on the way.

  7. Soybean RustScouting and Sample Submission • What to expect • Samples will be processed as soon as they arrive. • Microscopic examination • Moist chamber incubation • PDDC staff will contact you by phone if the sample appears to be positive for soybean rust (confirmation from APHIS will be needed for a first report on any given host).

  8. Soybean RustScouting and Sample Submission • What to expect • PDDC staff will follow up with a written report detailing disease problems whether the sample is positive for soybean rust or not. • There will be no charge for soybean rust diagnostics.

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