It looks somewhat strange that the order was centered into sparrows, rats, flies and mosquitoes, although all of those things have a point into the objectives the campaign had, I guess problems with locusts had to be way bigger than with sparrows in crops devastation before the campaign started. I mean, I hardly know about agriculture and I know how much of a threat they can be, even nowadays, much more it would be known on those times, that without considering the countless historical records about crops devastation by locusts.
So what's the reason they were left out in the campaign? It makes no sense that what was likely the biggest threat referring to crops devastation was left out intentionally, the most logical thing would have been a 5 pests campaign including the locusts according to the logic of the campaign.
Maybe it's just as simple as that it looked like they weren't the biggest problem and my guess is incorrect.
Thanks for your time.