INSECTS AND OTHER ANIMAL Pests INJURIOUS To FiELD BEANS 991 
Slugs are very often trapped by placing cabbage leaves, straw, culled potas 
toes, turnips, sacking, or shingles near their favorite haunts in the evening. 
In the morning they may be easily found and destroyed under these traps, 
where they have crawled to avoid the daylight. Poison baits of bran, 
chopped green leaves, drippings, and potatoes, mixed with arsenate of 
lead, white arsenic, arsenite of zinc, arsenate of calcium, or paris green, 
as the poison, are said to help in slug control. Fertilizers such as land 
plaster, nitrate of soda, potassium sulfate, and iron sulfate have been recom- 
mended, especially in European countries. 
For killing A. agrestis by contact or for controlling the slug by a repel- 
lent, it has been advised that plants be sprayed with blue vitriol solution, 
with bordeaux mixture, with pyrethrum, or even with hot water; and as a 
poison, a spray of arsenate of lead or calcium arsenate is suggested. 
It is thus evident that many methods of control have been advised, 
some of which may work well inasmail garden. Ina bean field of ten acres 
or more, with an even infestation thruout, the problem is one of greater 
complexity. 
Experimental work 
When this study was begun, in the summer of 1917, the easiest method of 
control appeared to be the application of a poison spray to the plants. 
Experiments along this line were started on July 17. Several rows were 
TABLE 7. Controt EXPERIMENTS AGAINST A GRIOLIMAX AGRESTIS 
_ Material applied | Effect on slug's 
Wrerye tien bOWACCOMMUSt Hi. cveine cis sine Sos ttes) d coe Nu de eeekbitelisteal a | Dead in 15 minutes 
Coarse tobacco dust.............. Aegis (On AMIR EON opened Wren | Not killed 
TECH OWEIEAS IIUTGYEA 6 hich oh tay Gt Pp ter Seer cei an aE ae ee Pee | Dead in 5 to 15 minutes 
Dry powdered bordeaux (dust)........0...........0.000. Dead in 5 to 60 minutes 
Tobacco dust, sulfur, arsenate of lead ( [5 aril) ehh car ete et Dead in 15 minutes 
Sulfur (finely ’ ground) Ap atl epi reese Soe hy ss Nth Le PA aaa Not killed 
Copper sulfate (10-per-cent solution)..................... | Dead in 15 minutes 
Copper sulfate (5-per-cent solution)...................... | Dead in 40 minutes 
Copper sulfate (2-per-cent solution)...................... | Not killed 
Simliocide (See. to 500 ce: of water)... 0/0 62.00. eel dh | Not killed 
iime-sultiums (I —2O}solution) a. esse ee ele ee ee es oe | Not killed; irritation caused. 
Black-leaf-40 (1 ce. to 500 cc. of water).................. Dead in 2 hours 
Quassia solution (hop-aphis formula).................... | Not killed 
Pinnvem (ainsi ale cl pve utes pauiietsyatd ais aveele Sins al siatiliontieteien's (edle- Dead in 3 to 20 minutes 
Wits bincysodan(GUSt) nme teie eee aa el aaeigaleis alas | Dead in 10 minutes 
Chloridezolalimel (dust) ih s:) elses ein enieate eek soe es Dead in 15 minutes 
Washing soda (1 pound in 3 gallons of water).............. | Not killed 
Chloride of lime (1 pound in 3 gallons of water)..........., Dead in 2 hours 
