Pink stem borer

The pink stem borer (Sesamia inferens) is a destructive lepidopteran pest belonging to the Noctuidae family. It is recognized as a major pest of various cereal crops, particularly in Asian agricultural systems, where it poses a significant threat to food security and farm profitability.

This pest is a notable polyphagous insect, meaning it feeds on a wide range of hosts. While rice is the most commonly attacked crop, the larvae also infest corn, wheat, barley, sorghum, and various wild grasses, making it difficult to control through host-plant exclusion alone.

The biological development of Sesamia inferens typically proceeds through four stages: egg, larva, pupa, and adult moth. Eggs are usually laid under the leaf sheaths of host plants. The larvae, which are the damaging stage, bore directly into the stems to feed, creating tunnels that disrupt the plant's vascular system.

Damage symptoms include "deadheart" formation, where the central leaf withers and dies, and the appearance of "whiteheads" at the panicle stage, which contain no grain. This feeding behavior causes significant physiological stress to the crop, leading to stunted growth, lodging, and reduced yield quantity and quality.

• Implement cultural practices like crop rotation and early planting.
• Remove and destroy infested crop residues and alternative host weeds.
• Monitor moth flight patterns using light or pheromone traps.
• Utilize biological control measures, including natural predators and parasitoids like Trichogramma species.
• Apply systemic insecticides during the peak period of larval emergence to target the insects before they enter the stem.