PHC Rx — Diagnose. Prescribe. Treat.

Regional field bulletin · every Monday

The Regional IPM Report

What is active this week, region by region, and when to treat it. Growing-degree-day readings anchored to extension station data, a featured pest, quarantine and invasion-front watch, and a diagnose-then-prescribe card for each of six U.S. zones. Written by an arborist, compiled from cooperative extension and USDA reporting.

Latest issue

Issue
W39.26
Sent
Sep 21, 2026
GDD base
50°F

HWA wool comes out of hiding, Michigan's map grows to 11 counties, and a sixth region joins the report — Sep 14–21.

Read issue W39.26

Back issues

  1. W38.26Sep 14, 2026Spruce spider mite makes its cool-season comeback, clearwing moths trigger false EAB alarms, and mushroom season opens the fall diagnostic window — Sep 7–14.
  2. W37.26Sep 7, 2026PHC RX Regional IPM Report Issue W37.26 -- Labor Day Special
  3. W36.26Sep 1, 2026Box tree moth quarantines double in Maryland, New Jersey stops shipments, scale crawlers hit last call — your windows for Aug 24–31.
  4. W35.26Aug 24, 2026EAB claims five new Texas counties, HLB reaches Imperial County, and scale crawlers hit peak — your region-by-region windows for Aug 17–24.
  5. W34.26Aug 17, 2026Scale crawlers are emerging, bagworm is at last call, and Virginia expands its SLF quarantine — your region-by-region windows for Aug 10–17.
  6. W33.26Aug 10, 2026Laurel wilt reaches Long Island, elm zigzag sawfly spreads, and magnolia scale crawlers are due — your region-by-region windows for Aug 3–10.
  7. W32.26Aug 3, 2026Manage fall webworm, mites, and SLF with region-specific pest control advice.
  8. W31.26Jul 27, 2026Manage fall webworm, mites, and SLF with region-specific pest control advice.
  9. W30.26Jul 20, 2026Manage fall webworm, mites, and SLF with region-specific pest control advice.
  10. W29.26Jul 13, 2026Japanese beetle is out early, bagworm hatch is complete, and scale crawlers are overlapping — your region-by-region treatment windows for the week of July 13.

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What each issue carries
National snapshotSix pest categories, one read
Pest on the chartScout window, hosts, Rx note
Regional alertQuarantines and invasion fronts
Soil-borne watchRoot and collar disease
Six zone cardsGDD · Diagnose · Prescribe

GDD base 50°F from Jan 1. Confirm against your nearest station before timing an application.