Clanis bilineata

Taxonomic classification: Clanis bilineata, commonly known as the soybean hawkmoth, belongs to the order Lepidoptera and the family Sphingidae. It is recognized as a significant agricultural pest, particularly known for its impact on soybean cultivation in East Asian regions.

Host crops: The primary host for this species is the soybean (Glycine max). While it shows a strong preference for legumes, the larvae are voracious feeders that can strip entire fields of foliage when population densities exceed economic thresholds.

Biology and life cycle: The species undergoes a complete metamorphosis: egg, larva (caterpillar), pupa, and adult moth. Adult females lay eggs on the undersides of soybean leaves. After hatching, the larvae go through several instars, feeding primarily at night and burying themselves in the soil for pupation. The pupal stage typically occurs in the soil, which serves as a site for overwintering.

Damage and economic impact: The larvae cause severe defoliation. Early-stage caterpillars skeletonize the leaves, while later stages consume entire leaf blades, leaving only the midribs. This massive loss of leaf area significantly inhibits photosynthesis, leading to reduced seed filling, stunted plant growth, and substantial yield losses for farmers.

Control measures: Management of Clanis bilineata requires an integrated approach to maintain crop health:

• Deep plowing in autumn to disturb and expose overwintering pupae.
• Use of biological control agents, such as entomopathogenic fungi or Bacillus thuringiensis.
• Application of selective insecticides at the early larval stage to prevent widespread defoliation.
• Field monitoring through light traps to track population spikes and time interventions appropriately.