How to identify
- Small pale-green larva that wriggles vigorously when poked
- Leaves with windowpane chewing that leaves the upper skin
- Adults are tiny gray moths that rest with diamond-patterned wings
Damage: Heavy leaf injury; can ruin transplants quickly.
Control methods
- Row cover from sowing or transplanting.
- Remove crop debris; rotate brassicas.
- Scout twice a week in warm weather.
What products to use
We list product types and what to check on the label — not brand rankings, prices, or “we tested” claims. Always follow the label for your crop, and prefer the least disruptive option that works.
Bt or spinosad (labeled)
When: Active larvae on leaves
Look for: Diamondback moth or cabbage caterpillars listed; rotate modes of action if pressure is chronic