What's eating my montgomery astilbe?

Montgomery Astilbe is largely pest-resistant and deer-tolerant, but black vine weevil larvae can silently damage roots, and spider mites strike in hot, dry summers. Asiatic garden beetles may notch leaf edges. Good moisture management and beneficial nematodes keep the worst threats in check.

Larvae hollow out roots, causing sudden wilting and collapse; adults leave characteristic C-shaped notches around leaf edges Apply beneficial nematodes (Steinernema or Heterorhabditis) to moist soil in late summer; use sticky barriers around crown to trap adult weevils

Fine yellow or silvery stippling on leaf surfaces; fine webbing between stems in severe infestations Mist foliage and improve air circulation; spray with insecticidal soap or neem oil, covering undersides thoroughly; repeat weekly

Adult beetles feed on foliage at night, leaving ragged notched holes in leaves from late June onward Hand-pick adults at night; apply beneficial nematodes to target soil-dwelling grubs; avoid over-irrigating which favors larvae