Delphinium

Symptoms: fuzzy gray-brown mold on leaves, stems, flowers, or fruit; soft watery rot on fruit and blossoms; dieback from cut or wounded stems; mold spreading in cool humid still conditions; blighted flowers that fail to set

• CulturalRemove infected tissue and old blossoms●●●Strongstrong evidence — extension confidence

  Prune out moldy leaves, stems, and fruit and clear fallen blossoms and debris where the fungus gets started, disposing of them rather than composting.

  Source: UMN Extension; Cornell

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• CulturalImprove airflow and reduce leaf wetness●●●Strongstrong evidence — extension confidence

  Space and stake plants for good air movement, water at the base in the morning, and harvest ripe fruit promptly so botrytis has fewer cool, humid, wet surfaces to colonize.

  Source: UMN Extension; Cornell

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Symptoms: white powdery coating on upper leaf surfaces; starts as spots then spreads; leaves yellow and dry under the coating

• CulturalImprove airflow + remove worst leaves●●●Strongstrong evidence — extension confidence

  Cut out the most heavily coated leaves and thin for airflow; avoid wetting foliage late in the day.

  Source: UC IPM

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• OrganicPotassium-bicarbonate or sulfur - label use only· every 1 wk · ~4 wks●●Moderatemoderate evidence — extension confidence

  Apply a labeled potassium-bicarbonate or sulfur fungicide weekly per the label. No sulfur within 2 weeks of oil or in high heat.

  Always follow the product label — it is the law.

  Source: UC IPM

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Symptoms: stunted yellowing plants that wilt despite wet soil; soft brown mushy roots; sloughing root outer layer leaving thread-like core; poor growth in low or compacted wet spots; seedlings collapsing at the soil line

• CulturalLet soil drain and water less●●●Strongstrong evidence — extension confidence

  Water root rots like Pythium thrive in saturated soil, so cut back watering, let the surface dry between irrigations, and water at the base rather than keeping soil constantly wet.

  Source: UMN Extension; Missouri Botanical Garden

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• CulturalImprove drainage and aeration●●●Strongstrong evidence — extension confidence

  Use raised beds, loosen compacted soil, and add organic matter to improve drainage; remove plants that are already rotted since affected roots won't recover.

  Source: UMN Extension; Missouri Botanical Garden

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Symptoms: large ragged holes with smooth edges; slimy silvery trails; damage worst after rain and overnight

• CulturalTrap, hand-pick at night, reduce cover· every 2 days · ~3 wks●●●Strongstrong evidence — extension confidence

  Pick at night with a flashlight, set shallow beer traps, water in the morning so soil dries by dusk, and clear damp hiding spots.

  Source: UC IPM: Snails and Slugs

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• OrganicIron-phosphate bait - label use only· every 1 wk · ~3 wks●●Moderatemoderate evidence — extension confidence

  Scatter a labeled iron-phosphate slug bait sparingly per the label; it's pet- and wildlife-safer than metaldehyde.

  Always follow the product label — it is the law.

  Source: UC IPM

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Symptoms: clusters of tiny soft-bodied insects on new growth and undersides; sticky honeydew or sooty mold; curled distorted new leaves; ants tending them

• CulturalBlast off with water· every 3 days · ~2 wks●●●Strongstrong evidence — extension confidence

  Knock colonies off with a strong jet of water in the morning; repeat every few days. Light infestations rarely need more.

  Source: UC IPM: Aphids

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• OrganicInsecticidal soap - label use only· every 1 wk · ~3 wks●●Moderatemoderate evidence — extension confidence

  For persistent colonies apply insecticidal soap to undersides per label. Avoid open flowers.

  Always follow the product label — it is the law.

  Source: UC IPM

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Symptoms: winding pale tunnels inside the leaf; pale blotches between the upper and lower leaf surfaces; tunnels/blotches that can't be rubbed off because the larva is inside

• CulturalPick mined leaves + row cover· every 5 days · ~3 wks●●Moderatemoderate evidence — extension confidence

  Remove and bag leaves with tunnels, and cover plants with insect netting to block the egg-laying flies. Damage is mostly cosmetic on leafy crops.

  Source: UMN Extension

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