My grandmother has a flower garden that's being overrun by grasshoppers, what can she do to get rid of them ?

The grasshoppers are small, possably babies and they're light green in color. They're eating all her flowers and it seems that's all they appear to be eating.

Answers:
sevin dust works great!

Other answers:
not much, even the best insecticides do not work very well in controlling a hopper hatch off!
not much, even the best insecticides do not work very well in controlling a hopper hatch off!
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