LONG-HORNED GRASSHOPPERS AND THEIR MANAGEMENT IN COCONUT AND OIL PALM ECOSYSTEMS

摘要

Long-horned grasshoppers or tree hoppers or katydids (Orthoptera: Tettigoniidae) are large, singing, winged insects. The males have song-producing, or stridulating, organs located on their front wings. Long-horned grasshoppers creates sounds by rubbing a scraper on one forewing against a file on the other front wing. The hearing organ of long-horned grasshoppers is located inside a slit on their front legs. The song serves a function in courtship. They get their name katydids from the way their songs sound. The females chirp in response to the shrill song of the males, which supposedly sounds like "katy did, katy didn't," hence the name. They have been called long-horned grasshoppers because of their long and slender shape, and their antennae, which may be two or three times the length of their body. These 30 segmented antennae are covered with sensory receptors that allow long-horned grasshoppers to find their way around in the dark, when most of them are active. They are called tree hoppers because of their arboreal nature and association with trees. Several species of long-horned grasshoppers cause damage to coconut and oil palm.