JOURNAL OF ECONOMIC ENTOMOLOGY 
182 
[Vol. 11 
bined have a total record of 748 hoppers where no molasses was used 
and 588 where molasses was included. 
In Series G, a bait made according to the standard formula modified 
by using one extra lemon and omitting the molasses, was applied to one 
fifth acre of alfalfa and a similar bait including molasses at the usual 
rate was applied to a nearby plot of the same size where the grasshoppers 
appeared to be equally numerous. After three days the dead hoppers 
were counted in a square area of 100 square yards located centrally in 
the fifth acre plot. A total of 234 dead hoppers were found where no 
molasses was included in the bait and only 68 in the plot where the 
bait contained molasses. 
Owing to the movement of the adult grasshoppers after eating a fatal 
dose, the figures for Series F and G cannot be given full value except 
as evidence that the use of molasses in the baits for the differential 
grasshopper did not increase the effectiveness. 
Sawdust 1 
A summary of the tests in which bran may be compared with pine 
sawdust in the several combinations shows that the sawdust was 
inferior to bran. For the sawdust combinations 405 hoppers were 
recorded whereas 781 were recorded for the corresponding bran com¬ 
binations. The former therefore gave only 52 per cent efficiency as 
compared with the latter. When mixed with bran in half and half 
mixtures, however, results were obtained which were practically the 
same as for the straight bran combinations, the half and half mixture 
having 724 hoppers recorded while the bran combinations have 697 
or approximately 4 per cent less. 
Sawdust and Canteloupe in Field Tests 
A cotton grower located near Phoenix whose crop was being damaged 
by the differential grasshopper, at the writer’s suggestion substituted a 
pound of canteloupe for the lemons ordinarily used with 25 pounds of 
bran. The results were reported to be entirely satisfactory, the grower 
finding dead hoppers in large numbers while few live ones remained. 
The report was convincing in its detail but was not verified by the 
writer. On August 19 Mr. Fisk, one of the writer’s assistants, pois¬ 
oned a thirty-acre alfalfa field using the 4-25 bran-lemon formula 2 in 
comparison with two mixtures containing half and half bran and saw¬ 
dust. One of these (B) was identical with the 4-25 formula except that 
the half and half bran and sawdust mixture was substituted for the 
1 The testing of sawdust was suggested by experiments conducted in Canada in 
1915. Forty-sixth Ann. Rept. Ent. Soc. Ontario. 
2 Bran 25 lbs., lemons 4, molasses 2, Paris green 1, water as needed. 
