232 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 13 
In respect to control measures, we have tried soil treatments, 
fumigations and sprays. As yet, we are not satisfied with any of the 
results. Hydrocyanic acid gas was used in August at the rate of one 
and one-half ounces for twenty minutes. A very serious burning of 
the foliage and young growth occurred and only a small per cent of 
the adults were killed. The burned plants were set back to such an 
extent that they did not fully recover that season. Dusting with a 
lead, sulfur and lime mixture when the plants are in the drought 
period (June and July) gives considerable promise for control. 
At the present time, Mr. May, who is the owner of this greenhouse, 
employs a beating method. When the adults are abundant in the 
morning, he puts his force to work beating the bushes. The men 
hold pans under the bushes and catch the adults as they fall. When 
the bushes are jarred, the adults will fall from them. This seems to 
be a very crude and an expensive method. The adults have been 
caught in large numbers and the infestation has been reduced to such 
an extent that this past season the injury produced by the adults was 
by no means as serious as in previous seasons. 
President W. C. O’Kane: The next paper on the program is 
“Poison Baits for Grasshoppers,” by W. P. Flint. 
ft 
POISON BAITS FOR GRASSHOPPERS 
By W. P. Flint, Urbana , III . 
Under Illinois conditions at least 75 per cent of the damage by grass¬ 
hoppers occurs in fields of clover, alfalfa, soy beans, cowpeas, and other 
legumes. This is not due so much to the fact that the hoppers hatch 
from eggs deposited in such fields as that they congregate in them dur¬ 
ing the summer. It would seem that under our conditions legumes are 
distinctly attractive to grasshoppers and it was thought that a poison 
bait with a strong legume odor might possibly prove more attractive 
than the standard bran-molasses-lemons bait. So far as known to the 
writer, no tests with such mixtures have been made, with the excep¬ 
tion of the alfalfa meal mixture which has been used to some extent in 
the west and very little in the states east of the Mississippi. The odor 
from the alfalfa meal, however, differs from that of freshly ground 
legumes, and has not been found particularly attractive to grasshop¬ 
pers. To test the effect of adding freshly ground legumes a series of 
experiments was carried out, using the standard bran bait in compari¬ 
son with a bran-Paris green bait containing the same amount of poison, 
but in which a certain amount of freshly ground legumes had been 
mixed. 
The inner bark of the black locust, Robinia pseudacacia, has the 
strongest characteristic legume odor to be found in any plant known to 
