Indoplanorbis exustus

Indoplanorbis exustus is a significant freshwater gastropod mollusk belonging to the family Planorbidae. In agricultural practice, it is identified as a major pest in irrigated systems, particularly in rice cultivation, where it can severely disrupt the early stages of plant development.

The primary crops affected by this pest are rice and other wetland plants. The snails feed on the epidermis and soft tissues of young submerged seedlings, causing substantial damage that restricts the plant's ability to undergo photosynthesis and absorb nutrients properly.

The biology of Indoplanorbis exustus is characterized by high adaptability to standing water environments. Being hermaphroditic, they demonstrate rapid population growth, laying egg masses on submerged plant debris and the stalks of crops. This reproductive strategy allows them to colonize large flooded areas in a very short period.

The damage caused by these snails is twofold: mechanical and biological. Mechanically, they consume young leaves, leading to stunting or total plant loss. Biologically, they are known vectors for trematodes, posing a risk not only to the crops but also potentially affecting the health of farm workers and livestock that interact with the irrigation water.

Effective management strategies against this pest involve an integrated approach:

• Implementing precise water management, including periodic drainage of fields to dry out egg masses.
• Mechanical removal of weeds from irrigation channels that serve as habitats and breeding grounds.
• Application of targeted molluscicides according to strictly monitored local regulations.
• Introducing biological control agents, including native predator fish species that feed on snails.