Diagnosing Grubs and Leaf Yellowing in Dracaena and Corn Plants

Finding white grubs with dark posterior ends in your dracaena's soil likely indicates pest entry via summer outdoor placement or contaminated potting mix. While these grubs rarely damage established plants, they're undesirable indoors. Submerge the pot in water for an hour to force grubs to surface, then consider a systemic soil drench if they persist. Always use sterile, peat-based soilless mixes to prevent recurrence.

Corn Plant (Dracaena fragrans) Leaf Yellowing

Progressive yellowing from tip to base on lower fronds suggests either spider mites (check leaf undersides for fine webbing and dust-like specks) or root issues. Overwatering is a common cause—corn plants need the top third of soil to dry between thorough waterings. A 15-inch pot for a 4-foot plant is likely oversized, promoting root rot. Check cane firmness: soft, papery bark indicates root rot.

Corrective Actions

Reduce watering frequency, ensure excellent drainage, and inspect for mites. If roots are rotted, propagate healthy top sections via air layering. Repot into a smaller container with fresh, well-draining mix if needed.