6 BULLETIN 263, IT. S. DEPARTMENT OF AGRICULTURE. 



dead ones. Another bog, in which the insects were found to have 

 reached the pupal stage, was renowed May 28 and 29 for a period of 27^- 

 hours. Soon after the water was drawn from this bog a second inves- 

 tigation was made which revealed no dead pupae and 49 live pupae. 

 Renowing the bog when the beetles have emerged from the ground 

 and before egg laying has commenced would undoubtedly carry some 

 of the beetles ashore where they could be killed with kerosene, but 

 this operation would have to come at a time when the young berries 

 are forming, and the use of water at that time is apt to be disastrous 

 to the setting of the crop. 



Carbon bisulphid was given a trial to determine its effect on larvae 

 and pupae in the soil. Used in holes at varying strengths of the 

 liquid and varying depths and" distances apart, negative results were 

 obtained in each plat. In plat 1 the holes were made a foot apart 

 and 4 inches deep and into each was poured one-half fluid ounce of 

 carbon bisulphid. The liquid nearly filled each hole and all holes 

 were covered with soil and tamped with the foot. Larvae found 

 within 2 inches of some of the holes were unaffected by the gas. 

 The failure of this substance to kill is thought to have been due to 

 the wetness of the bog which prevented the fumes from penetrating 

 the soil. No injury resulted to the vines except where drops of the 

 liquid were spilled on them from above. 



Observations of two seasons' spraying on a bog near New Egypt, 

 N. J., have shown that an arsenical, added to the customary 

 Bordeaux and resin-fishoil soap used to control the fungous diseases 

 of the cranberry, is of value in killing the beetles which feed on the 

 foliage. Arsenite of lime at the rate of 1 pound of white arsenic per 

 200 gallons of Bordeaux mixture per acre was the poison applied 

 by the owner of the bog the first year. Two applications were made, 

 the first beginning July 1 and the second July 14. In 1914 the bog was 

 sprayed more frequently owing to the presence of an infestation of 

 fireworms (Rliopobota vacciniana Pack.) . The dates of spraying were 

 June 11, June 18, June 30, July 9, and July 20. Arsenite of lime was 

 used in each instance, bu t beginning with the third application a differ- 

 ent method of preparing it was employed, as follows — 1 pound of 

 caustic soda was dissolved in 2 quarts of water and while this was dis- 

 solving, 2 pounds of white arsenic were added. It is essential in pre- 

 paring arsenite of soda after this formula that a very good grade of 

 caustic soda be secured, otherwise some of the arsenic may remain 

 uncombined and produce injury to the foliage or fruit. In five min- 

 utes the arsenic was completely dissolved, leaving a clear solution if 

 the crystalline variety of arsenic was used, or a silt-colored solution if 

 the amorphous arsenic was employed. The presence of a small 

 amount of lead in the amorphous arsenic seemed to account for the 

 cloudiness of the solution. Mr. F. S. Chambers, of J. J. White (Inc.), 



