It is like being in a thick snow storm but instead of snow flakes there are millions of locusts. The crops over an area of a million hectare can be devastated. It has been going on since biblical times and is still taking place today.
Modern insecticides have little effect on the migrating locusts.
It is necessary to find their breeding ground and attack them there before their numbers increase and they start migrating. Unfortunately research in insect physiology and the development of safe new insecticides has been drastically reduced over the last decade. DDT was a very good insecticide. Unfortunately DDT made the shell of bird eggs thinner and many pelican chicks in California died. DDT was being used to eradicate the malaria carrying mosquito in Africa.