Field Identification
A tiny moth whose larvae mine and window-feed brassica leaves, buds, and heads; infamous for evolving resistance to anything you lean on too hard—rotate modes and lean on biology first.
Adults are slender gray moths with a cream band that forms diamonds when wings fold; larvae are tapered green caterpillars that wriggle violently when touched. Many generations per year in warm weather.
How to Deal With It
Organic Control Methods
Bt aizawai or kurstaki on small larvae; spinosad as a rotated option; neem and soaps suppress light infestations—never rely on a single material all season.
Diadegma insulare and other ichneumonids, Microplitis plutellae, and predatory bugs—preserve with selective spot sprays.
Destroy crop residues promptly; avoid overlapping brassica plantings; use trap crops on plot edges.
Row covers until heads form; vacuums have niche use in high tunnels.
Pheromone traps for timing; scout for shot-holed cotyledons.
Let Nature Handle It
Natural Enemies
- Diadegma insulare
- Microplitis plutellae
- Minute pirate bugs
Threat Map