Desert locusts are devastating to agriculture because
a. they eat insects that play important roles in maintaining crop 6
b. small swarms can eat the same amount of vegetation in one day as an elephant
c. they require massive pesticide use that also harms or destroys crops
d. they create dust storms that blanket crops under desert sands

The correct answer is - b. small swarms can eat the same amount of vegetation in one day as an elephant.

The desert locusts are a true nemeses to the agriculture. They create swarms, be it large or small, they have millions of locusts in them, and for their size, they can eat a lot. A small swarm, can indeed eat as much as an elephant in one day, so when they do get to the plants they consider as food they are destroying them in a very rapid manner, and if it is a big swarm in question, in only few hours they can massacre hundreds of acres.