Behaviour

Herbivorous grasshoppers can fall as prey to other arthropods, particularly spiders, and also to the carnivorous bush-crickets - their orthopteroid cousins.

Many grasshoppers are parasitized by the Sarcophagid fly Blaesoxipha laticornis (Meigen). A single egg is laid in each grasshopper and the resulting larva feeds on its host’s body tissues, chewing its way out when ready to pupate.

Occasionally, dead or dying grasshoppers are found clinging to vegetation with their legs wrapped around the stems - often they have been attacked by the fungus Entomophthora spp.

http://www.ipmimages.org/browse/TaxImages.cfm?fam=183

The recent widening of field margins in southern England has benefited grasshoppers, but when these margins are cut in summer many grasshoppers die. Surveys of the meadow grasshopper and the field grasshopper, Chorthippus brunneus, are continuing.
http://www.essexfieldclub.org.uk/portal/p/Essex+Grasshopper+Recording