Your apple trees are growing well and producing healthy fruit in early summer, but your grape vines look wilted and have little holes all over them. You also notice a preponderance of moth larvae and Japanese beetles have started to emerge. What could you do to protect your investment?

Use pesticides.

Explanation:

I use pesticides to protect my grapes field because pests such as moth larvae and Japanese beetles etc attacked on my grapes field and to protect this field from further destruction, spray of pesticides is compulsory in order to kill the pests present on grapes. There are also some other methods such as mechanical and biological method to control the population of these pests in the field but these methods takes a lot of time to be effective.

answer; i believe the answer is hydraulic action;

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.