Rice grasshopper

The Rice grasshopper (Oxya velox) is a significant pest belonging to the order Orthoptera and the family Acrididae. This species is widely recognized for its impact on rice production, particularly in humid tropical and subtropical environments where irrigation systems provide a stable habitat for its development.

While rice is the primary host for Oxya velox, it is also known to feed on a wide variety of other monocotyledonous crops. This includes maize, sorghum, millet, sugarcane, and numerous wild grasses found in wetland ecosystems or along the periphery of cultivated agricultural lands.

The biological cycle of this insect is closely linked to moisture-rich environments. The grasshopper goes through incomplete metamorphosis, consisting of the egg, nymph, and adult stages. Eggs are typically laid in the soil or within the lower parts of plant stems, where they can survive adverse conditions through diapause until the favorable season begins.

The damage caused by these insects is primarily characterized by the defoliation of leaves and the scarring of stems. In cases of massive outbreaks, Oxya velox can strip entire fields, leading to reduced photosynthesis, lower plant vigor, and significant yield losses that threaten economic stability in affected regions.

Managing populations of the rice grasshopper requires an integrated approach:

• Sanitation of field borders and canal banks to eliminate alternative host plants.
• Implementation of precise irrigation management, including periodic flooding to submerge egg pods.
• Application of selective insecticides when population levels exceed the established economic injury threshold.
• Encouragement of natural enemies, such as parasitic wasps and predatory birds, to provide biological control.