Huge Swarms Of Grasshoppers Swarm Western U.S.

Grasshoppers invade western US in largest swarms in 35 years, plaguing farmers and ranchers

Strange Sounds

They’re arriving in swarms so dense it can appear the earth is moving. They’re covering roads and fields, pelting ATV riders, and steadily devouring grains and grass to the bedevilment of farmers and ranchers.

A massive population of grasshoppers is proliferating in the sweltering American west, where a deep drought has made for ideal conditions for grasshopper eggs to hatch and survive into adulthood.

“I can only describe grasshoppers in expletives,” said Richard Nicholson, a cattle rancher in Fort Klamath, a small community in southern Oregon, who once recalled seeing grasshopper bands eat 1,000 acres a day and cover the ground like snow.

The insects cause innumerable headaches for farmers and ranchers, competing with cattle for tough-to-find wild forage and costing tens of thousands of dollars in lost crops and associated costs. “They are a scourge of the Earth … They just destroy the land, destroy the crops. They are just a bad, bad predator.”

But grasshopper populations began ballooning in spring 2020, thanks to warmer and drier winters that favored survival, along with a lucky few rains that spur grass that feeds young grasshopper populations.

Oregon and Montana have been the hardest hit by the insatiable eaters, particularly in the arid eastern flank of both states. Thirteen other states are also facing grasshopper damage, according to hazard maps assembled by the animal and plant health inspection service at the US Department of Agriculture.

“The biggest biomass consumer in the country are not cattle, are not bison. They are grasshoppers,” said Helmuth Rogg, an entomologist and agricultural scientist who works for the Oregon department of agriculture. “They eat and eat from the day they get born until the day they die. That’s all they do.”

“They basically ate all the forage,” said John O’Keeffe, a cattle rancher whose eastern Oregon ranch was besieged by grasshoppers a year ago. The ranch was recently treated with insecticide to avoid being menaced again. O’Keeffe estimates grasshoppers cost him $50,000 in lost forage, plus the price of hay to feed cattle once rangeland forage was gone.

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