PINK BOLL WORM OF COTTON IN MEXICO. 55 
Cleaning Gins, Oil Mills, and Seed Warehouses. 
In Mexico, where the infestation grows to be very intensive, thou- 
sands of live larvaB have been observed to come from the cleaners with 
the trash. It is the common practice there merely to collect this 
trash containing the large number of worms and place it in piles. 
The " cleanings" should be caught in a receptacle rather than allowed 
to fall on the ground, because the larvae will crawl and secrete them- 
selves in cracks, crevices, and rubbish of various kinds. This trash 
should be either burned or subjected to some treatment insuring the 
death of the insects contained therein. If the trash does not contain 
too much dirt to make it unburnable, the best plan is to burn it in the 
boilers. A very good plan was devised by Mr. T. M. Fairbairn foi 
handling the unburnable material. The end was knocked out of 
an oil barrel and a small steam line run into the barrel, almost to the 
bottom. The trash from the cleaners fell into the steaming barrel 
and all larvae were quickly killed. 
After the season is over the gin plant or oil mill should be thor- 
oughly cleaned. All seed and rubbish should be removed from every 
nook and crevice of the machinery and buildings and burned. If 
the structure of the buildings permits they should also be fumigated 
after cleaning. 
It is the usual custom to keep enough seed on the plantations for a 
second planting in case it is necessary. This seed should be as care- 
fully fumigated as the seed that is planted, and as an additional pre- 
caution should be stored in a moth-proof screened room. It was very 
noticeable that the infestation always began earlier in the season 
and was heavier in the fields nearest the gins and seed warehouses. 
Fumigation. 
All seed used for planting or kept on the plantation after the 
first of March should be fumigated. An air-tight room is necessary 
for a successful fumigation, and it is better to build a special fumi- 
gation house at least a hundred yards from the other buildings, so 
that there will be no danger from fire. Carbon bisulphid is highly in- 
flammable, and no fire should be allowed around the house while 
fumigation is being done. The ordinary adobe construction is 
satisfactory, but precautions should be taken to see that plenty of 
mud is used and all cracks between the adobes well filled. A brick 
floor set in mortar should be provided and the inside plastered. The 
plastering not only makes the building more air-tight, but prevents 
absorption of the gases by the walls. The doors should be of matched 
wood, and paper should be plastered over the cracks when closed. 
Seed may be fumigated in sacks or in bulk, but in either case should be 
packed as little as possible. In no case should the seed to be fumigated 
be over 5 feet deep. One pound of carbon disulphid should be used 
