Sawfish (agricultural pest context)

In a strict scientific sense, the term Pristis refers exclusively to a genus of marine rays. However, in agriculture, the term is sometimes colloquially used for specific snout-bearing beetles.

These pests, often belonging to the Curculionidae family, are characterized by a long, saw-like rostrum (snout) which they use for feeding and egg-laying.

They belong to the order Coleoptera and possess a rigid, sclerotized exoskeleton, making them highly resilient to environmental stress.

The morphology of these beetles allows them to penetrate tough plant tissues, including thick bark and fruit husks.

Correct identification often involves observing the length and shape of the rostrum, which varies significantly between species.

These insects cause significant economic loss by damaging both the vegetative and reproductive parts of cultivated plants.

Larvae are internal feeders, boring into stems, branches, and fruits, which disrupts the transport of water and nutrients.

Adults feed on foliage and buds, which significantly reduces the photosynthetic capacity and overall health of the plant.

Fruit crops are particularly vulnerable, as feeding damage often leads to secondary infections by pathogens and fungi.

• Fruit trees (pome and stone fruits).
• Cereals and grain crops.
• Ornamental trees and shrubs.

Adult emergence typically coincides with the spring warming period, when the insects leave their overwintering sites.

Peak activity occurs during the blossoming and fruit-set phases of the host plants, which are the most critical times for protection.

Multiple generations may emerge throughout the summer if the environmental conditions remain warm and humid.

As autumn approaches, the beetles begin seeking shelter for hibernation, moving towards the soil or thick leaf litter.

Monitoring for the pest should begin early in the season to prevent the establishment of a large population.

The presence of small, circular exit or entrance holes on the surface of stems or fruit is a primary sign of infestation.

Wilting of the terminal shoots or entire branches often suggests internal damage caused by larval activity.

Frass (insect excrement) resembling fine sawdust found around the base of the plant indicates the presence of wood-boring larvae.

Deformed fruit growth and premature fruit drop are common indicators that the pest has affected the reproductive tissues.

Yellowing leaves despite adequate watering may indicate root or stem damage occurring beneath the surface.

Integrated Pest Management (IPM) is the most effective approach to minimize damage and ensure crop sustainability.

Pruning and removing infested branches immediately upon detection helps limit the spread of the insect within the garden.

Chemical control using systemic insecticides is most effective when applied during the period of adult migration.

Maintaining soil health and promoting biodiversity can help natural predators control beetle populations naturally.

Cultural practices, such as removing debris and weeds around fields, eliminate essential overwintering habitats for these pests.