Bush cricket

The genus Polysarcus belongs to the order Orthoptera and the family Tettigoniidae, commonly known as bush crickets. These are large insects that, under favorable environmental conditions, can reach high population densities and become serious pests in agriculture, particularly in hilly and mountainous regions.

This pest affects a wide range of herbaceous plants. Their diet includes cereals, legumes, and various vegetable crops. Due to their polyphagous nature, they are capable of destroying vast areas of crops during peak population growth, posing a significant threat to agricultural productivity.

The biology of Polysarcus is closely related to climate conditions. The life cycle involves egg, nymph, and adult stages. Overwintering typically occurs as eggs deposited in the soil. Upon the onset of warm weather in the spring, nymphs hatch and undergo several instars, feeding voraciously and causing progressive damage as they mature.

The characteristic damage involves defoliation, where the insects chew leaf tissues, stems, and reproductive parts of the plants. Their harmfulness is reflected in reduced photosynthesis, stunted plant growth, and ultimately, severe yield reduction or total destruction of specific crop patches.

Effective management and protection strategies include:

• Implementation of deep tillage to destroy egg pods buried in the soil.
• Strict management of weeds and edge vegetation that act as breeding sites.
• Chemical control using approved insecticides when the economic threshold is exceeded.
• Enhancement of biological control through the preservation of natural predators and parasitoids.