If the predatory insects (Blister Beetle larva, ground beetles, birds, parasitic nematodes) are not helping maybe a protazoan disease, "Nosema locustae" might be something to use before spraying such broad spectrum pesticides.

You might want to look into one of the Spinosad products. When applied properly, it has little effect on non-target insects and arachnids, even if the product comes into contact with them. Spinosad had shown to be quite helpful in the fight against grasshopper nymphs, much more so than the adults.

Spinosad, a biological agent, needs to be ingested for it to be effective. Use it to cover the foliage, not the flowers.

Bird bath, bird house, bird feeder.

Bring in some ducks or chickens and you can have excellent eggs.

Spinosad is highly toxic to bees so its use should be only as a last resort and then only appled with due care.

du_chall's idea is great--when I had hoppers taking over, I made a de solution & sprayed everything. It wasn't pretty, because everything had a grey film on it, but the hoppers checked out of the buffet. I did put up lots of birdhouses this year, birdbaths & feeders. I also got chickens. So far, so good. I haven't had to use the de. Good luck!

Hoop supported fabric row covers might work for you. Make sure you hand pick as many bugs as possible then put the row covers on to exclude the bugs.

Jon

Tabasco sauce ,a few drops in a 500ml spray bottle of water spray the veggies fruit trees pot plants ferns . The hoppers and moths take off like a jet .it works for us in cairns

Grasshoppers will eat Tabasco peppers so it would probably be more
efficient to use a cider or wine vinegar solution as that is one of the ingredients that can be found in hot sauce. Last year grasshoppers ate approximately 1/4 of my pepper crop.

Blast the hoppers off and put bug cloth - a fine mesh - over them.