Check your crops weekly once they have emerged for signs of damage.
Eggs: Look for egg masses on the undersides of the leaves.
Caterpillars: Look for caterpillars on the undersides of leaves and the whorl. They are light green to dark brown with stripes down their bodies. Large caterpillars have an upside down pale Y-shaped marking on the front and their second-to-last body segment has four dark spots in a square shape.
Damage: Look for small light coloured patches and large ragged, elongated holes on the leaves, emerging from the whorl.
• Note how many plants in 100 are recently damaged.
• Consider taking control measures if more than 20 whorls are damaged and caterpillars can be found on plants.
