What's eating my nelumbo lutea?

Nelumbo lutea (American lotus) grows natively in ponds and slow rivers across North America and faces deer, waterfowl, and aquatic beetle pressure. Aphids colonize new aerial growth. Deer browse emergent leaves at pond margins. Fish stocking, manual removal, and pond depth management are the key defenses.

Dense colonies on young aerial leaves and buds cause yellowing, honeydew fouling, and reduced vigor during spring emergence. Blast off with water so fish consume them. Remove worst-affected leaves. No chemical controls in pond water.

Deer wade into shallow margins or lean over banks to browse emergent lotus leaves and flower stalks, especially in garden pond settings. Install a low fence or wire enclosure around the pond perimeter. Repellent sprays are impractical near water; physical barriers are most reliable.

Geese graze on newly emerged lotus pads, uproot rhizomes in shallow areas, and can decimate young plants in ornamental ponds. Monofilament lines criss-crossed 15–20 cm above the water surface deter landing. Netting is effective for smaller ponds.

Caterpillars roll large lotus leaves and feed within, causing ragged holes and brown, wilted leaf segments on aerial foliage. Hand-pick larvae and dispose of them. Apply Bt spray to aerial leaves only. Avoid spraying toward the water surface.