Scale insects are persistent, sucking pests that can devastate collections. They're particularly drawn to Phalaenopsis. Two years of spot treatments (alcohol, soap) haven't worked because they miss crawlers and eggs hidden in crevices and potting mix.
Purchase a systemic insecticide labeled for orchids from your garden center. Follow label directions precisely. Treat at least 3 times at 7-10 day intervals to catch adults, crawlers, and newly hatched eggs. Wear protective gloves during application.
Unless a plant is completely destroyed, keep and treat it. Recovery may take a year or more. Quarantine new acquisitions—scale and mealybugs are notorious hitchhikers on new plants.
Scale are persistent once established. Inspect weekly, especially leaf undersides and stem bases. Early detection makes control infinitely easier.
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