http://www.pbs.org/wgbh/amex/influenza/peopleevents/pandeAMEX86.html
Within the camp were thousands of horses and mules that produced a stifling nine tons of manure each month. The accepted method of disposing of the manure was to burn it, an unpleasant task made more so by a driving wind. On Saturday, March 9, 1918, a threatening black sky forecast the coming of a significant dust storm. The dust, combining with the ash of burning manure, kicked up a stinging, stinking yellow haze. The sun was said to have gone dead black in Kansas that day.
Some, looking for a point of origin of the so-called Spanish influenza that would eventually take the lives of 600,000 Americans, point to that day in Kansas. Shortly before breakfast on Monday, March 11, the first domino would fall signaling the commencement of the first wave of the 1918 influenza...
What a bunch of crap.
My roses consider this the very best gourmet food. I can imagine burning it would make for an unpleasant stench though.