During heavy grasshopper infestations, even these barriers may be damaged by hungry grasshoppers. It may be necessary to apply insecticides to the fabrics before they are used to cover the plants.
Some plants that require insect pollination may require hand pollination when covered by row covers. These fabrics may be obtained through some garden centers and via mail order catalogs.
The following list of plants, which are preferred and not preferred by grasshoppers, was created by extension horticulture agents, master gardeners and others. The plants listed were observed under heavy feeding pressure from grasshoppers. As with all lists, results may differ as a result of various conditions and different breeds of grasshoppers.
Preferred by grasshoppers:
Liriope & Mondo Grass
Not preferred by grasshoppers:
Bridal Wreath Spirea
Dwarf Mexican Petunia
Perennial thrift and dianthus
Cultural Tips: Control summer weeds in fallow fields. Short grass fields are less attractive to egg-laying adults and also there is nothing for the nymphs to eat when the eggs hatch. Eliminate tall grasses and weeds from around any plants you wish to protect (crops, trees and gardens). This makes the area less attractive to grasshoppers and makes it easier for birds to prey on grasshoppers.