Alpine grasshopper

The Alpine grasshopper (Miramella alpina) is a species of short-horned grasshopper belonging to the family Acrididae and the subfamily Melanoplinae. It is primarily distributed in mountainous regions, where it thrives in alpine and subalpine meadows, but it is known to be a significant pest for various agricultural crops when its population surges.

This insect is polyphagous, meaning it feeds on a wide range of plant species. The primary crops affected include grasses used for grazing, forage crops, cereals, and occasionally vegetable crops and young seedlings. When swarms occur, the Alpine grasshopper can cause extensive damage to forage fields, significantly reducing the amount of biomass available for livestock.

The lifecycle follows a hemimetabolous pattern: egg, nymph (instar), and adult. Eggs are typically laid in the soil in late summer or autumn and remain in a state of diapause through the winter. Nymphs emerge in the spring once the soil temperature is sufficient. They pass through five instar stages, during which their appetite increases proportionally with their growth.

The damage caused by the Alpine grasshopper is characterized by severe defoliation. Adults and late-stage nymphs consume leaves and stems, which stunts the plant's growth and diminishes its ability to recover. In extreme cases, complete defoliation can lead to the death of younger plants or severe reduction in the overall yield of cereal and forage crops.

Effective management strategies require an integrated approach. Farmers should prioritize cultural practices such as tilling soil in late autumn to destroy egg pods and maintaining clean field margins to reduce favorable habitats. If the population threshold is exceeded, chemical control using targeted insecticides should be applied while the nymphs are still in the early instars, as they are most vulnerable at that stage.