Lily borer

Systematic position: The lily borer (Brithys crini) belongs to the order Lepidoptera and the family Noctuidae. It is a significant pest known for its specialized diet, primarily focusing on plants within the Amaryllidaceae family, often causing extensive damage to ornamental plantings.

Host plants: The pest primarily targets bulbous plants. Key host plants include lilies (Lilium), Crinum, Zephyranthes, Hippeastrum, and Narcissus. When populations are high, the larvae can consume almost all green parts and the internal tissues of the bulbs, threatening the survival of entire collections.

Biology and lifecycle: The lifecycle includes the egg, larval (caterpillar), pupal, and adult stages. Females lay eggs on the leaves of host plants. The larvae emerge and start feeding immediately. As they mature, they often bore into the stem or bulb, where they eventually pupate. Pupation typically occurs in the soil, which also serves as the primary overwintering site for the species.

Nature of damage and harm: The damage is primarily caused by the larvae, which hollow out leaves and stems. Once they reach the bulb, they feed internally, causing the plant to collapse. This damage makes the bulbs susceptible to bacterial and fungal rots, which often leads to the death of the plant within a short period.

Protection measures: Integrated pest management (IPM) is essential for controlling Brithys crini. Recommended practices include:

• Regular inspection of plantings for egg masses and early-stage larvae.
• Physical removal and destruction of infested foliage and bulbs.
• Application of systemic insecticides during the active growth period to reach larvae inside plant tissues.
• Soil cultivation to disturb and destroy pupae in their overwintering locations.