I am sorry to have to be the one to tell you this, but.... once you have grasshoppers in your yard, they are very hard to get rid of. You have a few choices to try, but the best thing may be to inspect your plants at least once a day (morning or evening is best) and to get rid of any pests you find. You can use a bucket with soapy water and drop them in the bucket, or if you like to really see they "extinguished" you can squish them or something.
You could try to introduce bugs that will eat them like the Praying Mantis, but if your grasshopper population is outta control this might not help much. You could also try planting things that naturally repel bugs such as Garlic, onions or Marigolds. If you choose Marigolds, even after they are spent, or they start looking crappy, you can dig them up and turn them upside down and replant for more bug repelling. This will also help them reseed and possibly come back the next season.
Another thing you can do it try to plant a very nice lush greenscape around your permiter of your yard to attract the grasshoppers there and away from your 'chids. However, that is probably too late to do now.
There are some products available that are a form of a Protozoan Disease. These are usually used for treating the nymphs and are only considered to be somewhat effective. These products go by names like Grasshopper Spore, Semaspore and Nolo Bait.
Last thing you could try and probably most effective is putting up some kind of screening. You can use panty hose or something like that and use some stakes around the plant in question to keep the grasshoppers from getting it. However, they can chew through most fabrics, so metal screening is preferred.
I know that isn't much help, but that is all I have....good luck!
Let us know if you can come up with something else~!
Grasshoppers eating my Vanda
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