Large white

The Large white (Pieris brassicae), also known as the cabbage butterfly, belongs to the order Lepidoptera and the family Pieridae. It is a highly significant agricultural pest found across various regions, often appearing in large numbers during the growing season.

The pest primarily targets cruciferous crops, including cabbage and oilseed rape. However, in cases of severe infestation or lack of primary host plants, the larvae are known to feed on other crops, such as bulb onion, fodder beet, industrial hemp, as well as watermelon, melon, and cucumber plants.

The life cycle consists of four distinct stages: egg, larva, pupa, and adult. Females typically deposit batches of yellow eggs on the underside of leaves. The larval stage is the most destructive, lasting several weeks, followed by pupation on stems or protected surfaces. The species is multivoltine, producing multiple generations per year depending on environmental conditions.

Larvae cause substantial damage through defoliation. Early instars live gregariously and skeletonize the leaf surface, while later stages consume entire leaves, leaving only midribs and veins. Such feeding pressure leads to severe yield loss, reduced plant vigor, and increased susceptibility to diseases that enter through damaged tissues.

Effective management requires an integrated approach. Cultural controls include early harvesting, destroying cruciferous weeds, and rotating crops. Chemical control involves the application of selective insecticides applied at the first signs of larval activity. Biological control using parasitoid wasps or Bacillus thuringiensis-based products is highly recommended to manage populations while preserving beneficial insects.