Sugarcane internode borer

Systematic position. The insect belongs to the order Lepidoptera, family Crambidae. Chilo tumidicostalis is recognized as a major pest of sugarcane, particularly prevalent in South and Southeast Asian agricultural landscapes, where it causes significant economic losses.

Host plants. Sugarcane is the primary host for this species. The pest is highly host-specific, rarely shifting to other crops unless forced by environmental pressures. It primarily targets the internodes of the sugarcane stalk, which serves as both its food source and habitat.

Biology and life cycle. The life cycle consists of four distinct stages: egg, larva, pupa, and adult. Females deposit eggs in clusters on leaves. Upon hatching, larvae immediately bore into the stalk tissues. The pest undergoes multiple generations per year, with the duration of the cycle being highly dependent on ambient temperature and humidity levels.

Damage and economic impact. The larvae feed inside the internodes, creating internal tunnels. This direct damage leads to "dead heart" symptoms in young plants and significant reduction in stalk weight and juice quality in mature ones. Furthermore, the tunnels weaken the structural integrity of the plant, leading to lodging and increased susceptibility to secondary rot pathogens.

• Selection and planting of borer-resistant sugarcane varieties.
• Removal and destruction of crop residues to eliminate overwintering sites.
• Release of biological control agents, such as egg parasitoids like Trichogramma spp.
• Application of systemic insecticides directed at the early larval stages.
• Implementation of integrated pest management (IPM) practices to maintain population levels below the economic injury threshold.