What's eating my coelogyne nitida?

Coelogyne nitida, a cool Himalayan orchid, is most commonly attacked by spider mites when grown indoors in heated rooms. Mealybugs and scale insects can target its pseudobulbs and roots. Slugs and snails may nibble new growth in cool greenhouses. Keep humidity high and inspect pseudobulbs closely during repotting.

Pale stippling and fine webbing on leaf undersides; foliage takes on a dull, silvery tone Mist foliage and raise humidity; apply insecticidal soap or neem oil spray to all leaf surfaces; repeat every five to seven days.

White waxy fluff at pseudobulb bases and in the root zone; sticky honeydew deposits Spot-treat with isopropyl alcohol; apply neem oil root drench for root mealybugs; repeat at ten-day intervals.

Shell-like bumps on pseudobulbs and stems; affected areas may yellow or develop necrotic patches Scrape off with a soft brush; treat with horticultural oil spray; recheck and retreat bi-weekly.

Ragged holes chewed in new leaves and flower spikes, particularly overnight in humid growing spaces Handpick at night; apply iron phosphate pellets around pots; use copper tape as a barrier.