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Spotted lanternflies spotted laying eggs for fall
September 20, 2026
recorded at 77 sightings through September 19, clustering heavily in Washington DC and surrounding Virginia and Maryland areas. The invasive Asian planthopper feeds on tree of heaven and other woody plants and is in its fall egg-laying period when populations remain visible before dormancy.
Monarch migration passes through on way to Mexico
September 20, 2026
butterflies recorded at 182 sightings through September 19 across the region. The species is federally proposed for threatened listing. Fall migration through the inner piedmont coincides with monarchs moving south to overwintering sites in Mexico, a critical annual cycle for the population.
Fairfax County climbs out of drought
September 20, 2026
Drought severity in Fairfax County dropped sharply from 100% moderate drought or worse in late July to only 0.02% by September 15-21, relieving water stress on native plants. The near-complete resolution of drought conditions this week supports normal fall fruiting and seed maturation phenophases across the ecosystem.
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