University of Arizona 337 



effect could be detected. In one series in which a medium Hght 

 grade of molasses was used instead of the usually recommended 

 darker grade the results were almost perfect, tending to show, inde- 

 pendent of all other experiments, that a darker grade, particularly 

 "Black Strap," is not necessary. 



Baits for use against the differential grasshopper which can be 

 tentatively recommended as a result of two seasons' work reduce 

 the cost of the materials from approximately 50 cents to less than 

 35 cents. When cull canteloupes are available the cost runs as 

 low as 30 cents per acre. This is on the basis of one pound of 

 Paris green to 5 acres of land. 



Poisoned baits are the principal means of combatting cutworms. 

 The regular grasshopper baits are generally recommended thruout 

 the United States at present, altho a few years ago the simple 

 combination of bran and Paris green with or without water was 

 considered satisfactory. As far as know^n to the writer there are 

 no published results of cutworm experiments showing the value of 

 either lemons or molasses in combination wath the bran and Paris 

 green. An excellent opportunity for testing the bran, Paris green, 

 and water combination against a common alfalfa pest (Feltia annexa 

 'JV.) was afforded in the fall of 1918 with apparently perfect results. 

 No live worms could be found in the treated field three weeks after 

 the application altho they remained in destructive numbers in a 

 nearby field which had not been poisoned. Cutworm poison con- 

 sisting of half a sack of bran (32^ pounds) and one pound of Paris 

 green costs at the present time at the rate of 36 cents per acre as 

 compared with 50 cents or more per acre for the usual grasshopper 

 bait containing molasses and lemons. It seems reasonable to as- 

 sume until actual tests prove the contrary that molasses and lemons 

 are unnecessary and of no value in baits for cutworms. 



In connection with investigations of grasshoppers and cotton 

 square daubers (Lygiis clisiis var. hesperus Knight and L. pratensis 

 ohlincatus Say) it was discovered that many cotton fields suffer from 

 these pests as a result of the insects being driven out of adjoining 

 alfalfa fields when the alfalfa crop is cut. As a result of observa- 

 tions made on this point an article was prepared and published in 

 leading publications in cotton growing districts of the State recom- 

 mending a system which helps to protect cotton from injury from 

 this source. Alfalfa cutting and raking in fields adjoining cotton 

 fields should be started on the sides and continued toward the cen- 

 tral land or a land near to it on which alfalfa should be left 

 standing temporarily. The grasshoppers and cotton square dau- 

 bers aie thus concentrated near the center of the field. The grass- 



