Clear-winged grasshopper

The clear-winged grasshopper (Camnula pellucida) belongs to the genus Camnula within the family Acrididae (short-horned grasshoppers), order Orthoptera. It is recognized as a significant agricultural pest, particularly in North America, due to its ability to undergo massive population outbreaks. These outbreaks can cause extensive economic damage to large-scale agricultural operations, threatening food security and farmers' profitability.

This pest exhibits broad dietary preferences, attacking a wide range of important crops. Primary host plants include cereals such as wheat, barley, and oats, as well as forage grasses, legumes, and even garden vegetables. Because these insects often feed in large swarms, they are capable of defoliating entire fields in a very short time, significantly reducing the biomass and overall health of the affected vegetation.

The life cycle of Camnula pellucida consists of three developmental stages: egg, nymph, and adult. The insect overwinters as eggs buried in the soil, typically in dry, well-drained locations with sparse vegetation. Nymphs emerge in the spring as soil temperatures rise and progress through five developmental stages (instars) before reaching adulthood. Adult grasshoppers are highly mobile and capable of long-distance flights, which facilitates the rapid spread of the infestation to new areas.

The damage caused by the clear-winged grasshopper involves the aggressive consumption of foliage, stems, and seed heads. Heavy feeding pressure can lead to total defoliation, which severely inhibits the plant's ability to undergo photosynthesis and store energy. For grain crops, this often results in reduced yield quality and quantity, while pasture land can be rendered useless for livestock grazing if the infestation is severe enough.

Effective management strategies rely on integrated pest management (IPM) practices, including cultural, biological, and chemical interventions. Key cultural practices involve tilling egg-laying sites to expose eggs to harsh winter conditions or desiccation, and controlling host weeds. During significant outbreaks, the use of registered insecticides is necessary to suppress population levels.

• Monitor fields for early nymph sightings.
• Maintain records of insect density per square meter.
• Implement insecticide applications only when economic thresholds are reached.
• Use biological control agents where appropriate.