Pest identification
What's eating my salvinia molesta?
Aphids
Signs: Colonies on the upper frond surface cause yellowing, curling, and sticky honeydew residue.
Control: Dislodge with a water spray; remove heavily infested fronds; encourage natural predators near outdoor ponds.
Water snails
Signs: Snails rasp through fronds, leaving holes and debris that invite rot.
Control: Hand-pick at dusk or deploy snail traps; remove egg masses from container walls.
Pond fish (koi, goldfish)
Signs: Fish graze and uproot floating mats, preventing establishment.
Control: Grow in a separate container or protect with a fine mesh guard over the water surface.
Keep salvinia molesta pest-free
Healthy plants resist pests best. Get the basics right:
Salvinia molesta pests — FAQ
What is eating my salvinia molesta?
Salvinia molesta (giant salvinia) is a vigorous floating aquatic fern used in water gardens. Aphids are the most frequent pest indoors and in container ponds. Outdoors, water snails and grazing fish pose threats. In natural waterways the salvinia weevil (Cyrtobagous salviniae) is used as a biological control agent but is not relevant in home settings.
How do I get rid of aphids on salvinia molesta?
Colonies on the upper frond surface cause yellowing, curling, and sticky honeydew residue. Dislodge with a water spray; remove heavily infested fronds; encourage natural predators near outdoor ponds.
How do I get rid of water snails on salvinia molesta?
Snails rasp through fronds, leaving holes and debris that invite rot. Hand-pick at dusk or deploy snail traps; remove egg masses from container walls.
How do I get rid of pond fish (koi, goldfish) on salvinia molesta?
Fish graze and uproot floating mats, preventing establishment. Grow in a separate container or protect with a fine mesh guard over the water surface.