Disease · 58

Powdery Mildew across the plant library

58 of the 505 plant guides in this library name powdery mildew among their diseases. Every one is listed below, linked to its guide and grouped by the kind of plant it is, so you can see at a glance which corners of a garden it turns up in.

This is the library read down a column instead of across a row. Each plant guide names its own diseases; nobody publishes the other view — which of the plants you actually grow share one, and whether the timing they record agrees.

The 58 plants that list powdery mildew

Grouped by plant type. Where the library attached a note to the entry — “rare”, “on seedlings”, “in wet clay” — that note is printed next to the plant, verbatim, because two plants can name the same disease and mean opposite things by it.

Where it concentrates

Botanical families with more than one affected plant in the library, counted from the same 58 guides above. 12 of 58 are Asteraceae.

  • Asteraceae12 plants
  • Fabaceae5 plants
  • Lamiaceae5 plants
  • Ranunculaceae5 plants
  • Cucurbitaceae4 plants
  • Rosaceae3 plants
  • Caprifoliaceae2 plants
  • Grossulariaceae2 plants

How the library qualifies it

Every distinct note the guides attach to an entry for powdery mildew, verbatim, with how many plants carry it. The other 32 guides list it bare, with no qualifier at all.

  • late×6
  • minor×6
  • cosmetic×3
  • crowded plants
  • far less than red bee balm; thin stems to prevent
  • in dry soil
  • late season
  • mildew-resistant cultivars help
  • old varieties; Natchez-era hybrids resist
  • on some purple cultivars
  • the one flaw
  • the phlox tax
  • universal by August, harmless
  • universal by September

Shared timing — and where it doesn’t agree

The library records no treatment window for powdery mildew. 30 of these 58 guides do record a spray or management program, but every one of them is about something else — a blight schedule, a curculio spray, a mildew note. None names powdery mildew. Rather than manufacture a consensus out of unrelated entries, this page reports the absence. The individual guides carry whatever timing the library does hold.

Timing only — the label is the law

This page reports when the guides in this library say to watch for powdery mildew and when a treatment is worth considering. It is not a recommendation to apply any product. Read and follow the product label before you spray — under federal law the label is the legal instruction, and using a pesticide against it is illegal.

  • Check the pre-harvest interval. Every product that’s cleared for an edible crop sets a minimum number of days between spraying and picking. Find it on the label before you spray anything you intend to eat.
  • Check the re-entry interval before you or anyone else works in the treated area again, and use the protective equipment the label names.
  • Confirm the product is registered for your crop in your state. This page groups many different crops together, and a product legal on one of them is not legal on all of them — state registrations differ too. Your state pesticide agency or local extension office can confirm both.
  • Rates and mixing instructions come from the label, never from us. We don’t publish them because they differ by product and formulation.

What else these plants get

Counted over the same 58 guides: the other problems most often listed on a plant that lists powdery mildew. These are co-occurrences in the library’s own records, not a claim that one causes another.

Aphids26 sharedJapanese Beetles6 sharedSpider Mites5 sharedCucumber Beetle4 sharedAnthracnose3 sharedCrown Rot3 sharedDowny Mildew3 sharedLeaf Spot3 shared

Keep reading

Downy Mildew17Root Rot73Rust26Leaf Spot22Crown Rot21All diseasesPests