150 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 14 



in twenty-five to twenty-nine days at which time it pupates within the 

 nut. The nuts are usually webbed together by the larvae and the pupal 

 stage is passed in nuts which are tied fast in this way on the tree. Altho 

 there are three generations very little damage is done except by the first 

 generation. Due to the fact that the nuts are so small at this time, the 

 damage is little noticed. Sometimes the second generation destroys a 

 considerable number of nuts but as a rule it is the first which does the 

 major portion of the damage. 



It was estimated last year (1919) that there were produced in Texas 

 about one thousand cars of pecans. The past season (192U) there was 

 almost an absolute failure of the pecan crop. Nearly all pecan growers 

 are of the opinion that the failure was due to frost. The same opinion 

 is given in reports of the United States Bureau of Markets. That such 

 was not the case may be seen by examining the following tables. The 

 following series of experiments were conducted at Corsicana, Texas, in 

 an orchard of about six hundred trees. This place was admirably 

 suited for such an experiment because all the trees are Halberts and 

 about ten years old. A portion of the orchard comprising fifty trees 

 were used in this experiment. These trees were about of the same size 

 and age and according to the owner, Mr. J. M. Blackburn, of about 

 the same bearing capacity. These trees were arranged as nearly as 

 possible in plots of fours according to their size. Four were sprayed 

 and the next set of four were not sprayed. Once each week the nuts 

 from each tree which had fallen to the ground were collected and coimted. 

 The number which had fallen because of the attacks of the case bearer 

 larva were tabulated in one column and those which had fallen from 

 other causes were tabulated in another. 



In spraying pecans it is necessary to use a first-class power sprayer 

 which will maintain at least two hundred and fifty pounds pressure. 

 One which will keep a pressure of three hundred and fifty pounds is 

 better. One of the standard makes of spray gims is also desirable as 

 more efficient work can be done with a spray gun than with a nozzle. 

 The orchard was first sprayed May 8 with arsenate of lead at the rate of 

 three poimds per fifty gallons of water. A second spraying was made 

 May 22. These two applications were made for the first brood larvae. 

 A third spraying was made on June 26 for the second brood of larvae. 

 Some years it is necessary to make this application but the past season 

 it was unnecessary since the number of larva of the second generation 

 was so small that they did very little damage. In 1919 however, the 

 second generation of larv^ae did considerable damage and this application 

 was necessary. The control of the insect can best be accomplished in the 

 first generation. 



