Just checked my fields west of Edmonton and there is a healthy hatch of hoppers in spots. Mostly fencelines and pasture but they have moved into my wheat and canola in places. Will this rain kill them? I've never really understood if rain kills living hoppers or only kills them as they hatch.
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here's a good summary of the effect of weather on hoppers (from Alta Agric. Ropin the Web)
Weather effects on population:
Cold winter temperatures are not usually enough to kill the eggs. Spring temperatures can affect grasshoppers in two ways. A warm spring will speed hatching and development, as well as plant growth for feed availability. Cool spring temperatures will slow hatching and development. A small population of grasshoppers may inflict the same amount of damage under warm dry conditions as a large population under cool wet conditions. The chance of drowning the nymphs is very low as the eggs are laid in areas that are not likely to have water accumulation. Cool wet weather in the spring will affect grasshoppers by slowing their development and increasing the chance of fungal growth and disease that will decrease next year’s population.
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