Tall Phlox 'David' with Curled, Shriveled Stems: Stem Nematode Damage

A gardener's phlox, usually reliable, showed curled, shriveled stems and leaves at emergence; a few stems recovered. A book suggested stem nematodes.

Management

Tom said nematode controls are highly toxic, typically for professionals. Best control: destroy affected plants and replant in uninfected soil. Nematodes spread via transplants (they live on plants and in soil). Some plants may recover; keep soil well-drained, add organic matter. Submit a sample to the local County Extension for definitive diagnosis.

Stem nematodes are difficult to eradicate; sanitation and clean soil are primary defenses.