Not only the target will be affected. You can think of the spraying as a extinction event. This single event will probably cause an abrupt shrink in biodiversity and subsequently a different community will occupy the empty niches.

The locust should be harvested and consumed (both as feed for livestock and/or nutritious food for people), instead of spraying them with poisonous insecticides.

A very bad idea, like building a sand castle against a rising tide. It is not like the locusts are an invasive exotic insect, these are the natural natives? We think we can eliminate nature in areas for our own uses, but sometimes we need to let nature have those areas, like Professor E.O. Wilson is suggesting, at https://eowilsonfoundation.org/half-earth-our-planet-s-fight-for-life/

where he is suggesting that humans give up half of the planet for wildlife?

I think the Kenyan government's focus now is just to contain the locust surge

However it should not be done at the detriment of the environment and biodiversity

May definitely or somewhat impact on biodiversity and some species. Must becarefully planned in a way that would ensure ecological harmony without severe consequences

There is always a win-win possiblity

Of course, the effect will be harmful to biodiversity

When you remove a bolt or two of the biological boat that all of the species of the planet we are traveling in, you selfishness of wanting all of the boat for our own species, may doom the rest of the passengers of the boat, when you sink that part of the boat.

That part of our boat has already been sunk in the one billion acres of deserts in the northern hemisphere, where the development of domesticated grazing animals 6,000 years ago, changed those areas from grassland savannah to barren deserts so quickly, that whole civilizations had to abandon their 1,000 cities in the Indus Valley for example.

All they had to do is cut down the trees that were creating the rainfall for the five million people living there, to fire the bricks for their cities, then, the rain stopped, and every one of their 1,000 cities were abandoned in an area covering 1/3 million square miles.

The locusts are trying to teach us an important lesson, that we have to give nature room in the tiny boat we all are trying to survive on, so we can thrive--and they can thrive also, unmolested by our own needs for land and space?