University of Nebraska Entomologist Jeff Bradshaw says a large grasshopper population could threaten the state’s winter wheat crop. Winter wheat is starting to emerge no. Grasshopper populations typically decline through the late summer and fall; however, large populations can remain after the first hard freeze.
He says growers need to monitor grasshopper density in areas surrounding their fields before and after planting. Nebraska State Entomologist Robert Bradshaw, says 11 to 20 grasshoppers per square yard in non-crop borders around newly planted wheat fields could be enough to cause significant loss.