killing insects - Knowledgebase Question

Merkel, Te
Avatar for katesmith19
Question by katesmith19
July 20, 2010
My yard is being invaded by grasshoppers. I try to grow iris, cannas and amaryllis. Is there one repellant/killer I can use on them all? Thank You.

Answer from NGA
July 20, 2010
There is not a really good way to control grasshoppers since new ones are always moving in from surrounding areas. You could try applying an insecticide to the leaves to kill the insects. However, treating the plants with pesticide may kill grasshoppers that eat leaves, but more will simply migrate in thus rendering that option not so effective in preventing damage. There is a natural spore that is quite effective against nymphs. It is known as Nolo Bait. However there is still the problem of the insects migrating in from an untreated area. Another option is to cover the plants with a lightweight, spunbound polyester rowcover fabric or some type of fine netting. This can help protect the plants from the grasshoppers. However, during an especially bad invasion last year I spoke with a friend who stated that grasshoppers had eaten their way through the rowcover! Some gardeners claim that sprays of kaolin clay (Surround is a commercial product) will discourage grasshopper feeding. Best wishes with your garden!

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