Listening to Public Broadcasting on station WNYC this morning, there was a news item "Largest Plague Of Locusts In A Quarter Century Hits Africa And Middle East" which is referenced at this URL:
https://www.wnyc.org/story/largest-plague-of-locusts-in-a-quarter-century-hits-africa-and-middle-east/
The person being interviewed made two statements. One, the number of locusts is increasing by forty-fold every three months and two, the number of locusts is increasing by ten-thousand-fold every nine months.
Given these two datums, one can derive the Nfold multiplication factor versus time in months as follows:
This result may help put the crisis in its proper perspective, a multiplication by approximately 2½ each month.