992 I. M. Haw ery 
sprayed with a mixture of 3 pounds of powdered arsenate of lead to 50 
gallons of water. No difference could be noticed between the sprayed and 
the check plots when they were examined some time later. Slugs were 
placed also on sprayed plants in cages. Feeding was noticed on the leaves 
but the animals were not killed. In the greenhouse, in December of 
1917, a slug devoured two heavily sprayed plants and lived for many 
days. From these data it seems evident that ordinary doses of arsenate of 
lead do not kill Agriolimaz agrestis. 
The experiments summarized in table 7 were carried on in the insectary 
at Ithaca during the winters of 1917 and 1918. The slugs were sprayed 
with the liquid or were dusted lightly with the powder, after which they 
were returned to natural conditions, on moist earth in an open jar. 
It may be seen from table 7 that under insectary conditions many dusts 
proved effective. Copper-sulfate solution also showed strong killing power. 
It was noticed at this time that a 10-per-cent copper sulfate solution, sprayed 
on a piece of paper and allowed to dry, was very irritating and sometimes 
fatal to a slug that crawled across the paper. Lime, chloride of lime, and 
washing soda were more effective in the form of dust than in the liquid 
form. Approximately ten slugs were used in each test. 
The experiments summarized in table 8 were likewise conducted in the 
insectary during the winters of 1917 and 1918. Bean plants growing in 
a bench, and also the ground close to them, were treated with the various 
liquids and dusts, and a cylinder open at the top was placed over them. 
TABLE 8. Controt EXPERIMENTS AGAINST AGRIOLIMAX AGRESTIS 
Material applied Effect on slugs 
Hydrated lime water (1 pound to 3 gallons)...... 1 killed, 1 kept from plant for cne week 
Stone lime (1 pound in 2 gallons of water)........| Killed in trying to reach plant 
Bordeauxi(454= 50) eee esa eee ee ee es Sees goes | Chose unsprayed in preference to 
' sprayed leaves 
Arsenate of lead (2 pounds in 50 gallons of water) .| Alive after eating two plants 
Arsenate of lead, as above, sweetened with | 
INlOIASSESIs.A isis ne eee ie ete eee Me ga pn, Sas Molasses injured plant 
Calcium arsenate (1-50) and sulfocide............| Slug not killed; little feeding 
Calcium arsenate (1-50) sweetened.............. Molasses injured plant 
Sodium arsenate (10 grams in 1 gallon of water). .| Slug alive; plant killed 
Check (sprayed withswater))....)..5....:.-..-:.-; Slug alive 
iKansasiorasshoppenibaltweer rence ee roeer aoe 3 of 4 slugs alive 1 week later 
Salt and: limed(lSlO): Bases ys he og es Slug killed in 24 hours 
Tron sulfate (10-per-cent solution)...............) Plant killed 
Arsenate of lead and lime (1-8)................. | Slug kept frem plant for 1 week 
iHelleborevandvlimey((l=25) ners ca ee Slug killed in 2 hours 
