Grasshopper Guide

Summer 2009 Maps

July 6 (originally posted as a projection)
June 22 (originally posted as a projection)
June 16 (originally posted as a projection)
June 6 Map (based on weather forecast)
June 4 Map of hatching survey results (30 sites)
May 27 Map

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Here are some interesting news stories from the US (SD).Maybe it will build here later. For now, grasshopper density in most of southern AB is low, but the weather is just right for reproduction. SK is mainly low with scattered pockets of higher numbers.

This page provides (1) a summary of recent weather and infestations, with a general forecast update for the Prairies, and (2) a map that allows you to find the expected hatching and monitoring dates in your area. Also refer to Current Photos, and the Grasshopper Guide, to find out about how to recognize the damaging kinds of grasshoppers.

June 9 update: rain and cool weather has halted hatching and killed some of the newly hatched hoppers.  This resets the situation a bit, and guarantees that grasshopper risk will be later this year, and lower than average.

May 27: this map gives a relative index of heat accumulation so far.  Although grasshopper egg numbers are low in most places this year, this map allows separate information on expected timing.  The two together will give you an idea of the expected numbers hatching.  Interpretation of the May 27 map: grasshoppers are just beginning to hatch in the red and orange zones.  The cooler zones will hatch later, during June 2-12, depending on the weather after May 28.