336 Annual Report Agricultural Experiment Station 



4. A mixture composed of wheat and corn bran (not over 50 

 percent of the latter) is as good as straight wheat bran. 



5. Canteloupes are fully equal to lemons as ingredients of 

 poisoned baits. 



6. Molasses does not add to the value of the bait. 



7. London purple as the poisonous ingredient in baits is in- 

 ferior to Paris green. 



Owing to the shortage of wheat bran, barley middlings was 

 extensively used in Arizona in 1918 as a substitute in grasshopper 

 baits. It was necessary to use sawdust with the barley middlings 

 to prevent lumping, the proportion used and advised being from 

 two-fifths to one-half sawdust. In the experiments here considered 

 in which combinations of barley middlings were used approximately 

 120 acres of infested lands were treated. The results were not as 

 satisfactory as observed in many other cases where barley middlings 

 and sawdust mixtures were used on large areas in demonstrations 

 and in subsequent work by alfalfa and cotton growers. Fortunately 

 it is probable that hereafter there will rarely if ever be any occasion 

 for the use of barley middlings as a substitute for wdieat bran. 



Horse manure has been recommended by the writer and suc- 

 cessfully used in Arizona in grasshopper baits, mixed according to 

 the formula known as "Criddle mixture," but this has not been 

 tested particularly against the differential grasshopper as far as 

 known. Outbreaks of the differential grasshopper occurred in 1918 

 in localities where neither wheat, bran, barley middlings or sawdust 

 were available. In one instance it was reported that a farmer used 

 dry horse manure in the place of bran with good results. Tests 

 made in the Salt River Valley in 1918 with dry horse manure in 

 various combinations did not give very satisfactory results but 

 more work with this material is very desirable and is planned for 

 next season. 



Corn bran alone appeared inferior to barley middlings and saw- 

 dust but the conditions were such in the tests of this that even 

 tentative conclusions could not be drawn. A wheat and corn bran 

 mixture was used with almost perfect results. This mixture was 

 purchased as wheat bran but was apparently nearly one-half corn 



bran. 



Of the nine series of experiments in 1918. six gave results re- 

 lating to the use of molasses. In four series in which molasses was 

 omitted in one or more tests this did not appear to reduce the effec- 

 tiveness of the baits. In one experiment in which the molasses was 

 increased two-thirds over the usually recommended amount no 



