AND OTHKR INJURIOUS INSIiCTS OF I907 AND I908. 



97 



Remedies: Some repulsive wash, eoiitaiitiiKj arsenate of lead, 

 four to six pounds for ez'ery fifty gallons, applied to trunks and larger 

 branches in the early fall zvould be beneficial. Cutting dozvni and burn- 

 ing of badly infested trees during the ziHuter or early spring. Some 

 compound containing whale oil soap or other soap ivith the ad- 

 dition of a liberal supply of powdered sulphur or crude carbolic acid 

 or both, and zuhitezcash, might be used as a repcllant, to zvhich thc\ 

 arsenate of lead could be added as indicated. The poison is added in 

 order to kill young borers as they enter the tree, should any beetle 

 venture to lay her eggs in crevices of the bark in spite of the presence 

 of the repcllant wash. The fact that tlie adult beetles frequent golden- 

 rod in the fall would prompt one to keep this plant away from the 

 proximity of locust trees. It has been suggested that, in coating the 

 trunks of trees in parks and on private grounds with anything of the 

 nature of whitewash, lamp black or some similar coloring matter could 

 be added to the wash, making the latter harmonious in color with the 

 bark of the treated tree, and thus avoid the glaring effect of a zvhite- 

 washed trunk. 



THE BOX ELDER MAPLE BORER. 



A new pest of the Box Elder in Minnesota, aft'ecting the young 

 twigs. This was frequently complained of dur- 

 ing the summer of 1908. 



This insect was reared in the in sectary, and 

 proves to be a Tortricid. 



It was first collected upon the Station 

 grounds on July 2nd, 1908. On July 17th pupae 

 were found in numbers, some in cocoons outside 

 of the twigs, and some inside of the burrows in 

 the twigs. Moths emerged between July 21st 

 and lulv 30th. Some of these were transferred 

 to a small Box Elder in breeding cage, and al- 

 though no eggs were observed, we found on 

 August 4th small caterpillars were feeding upon 

 the leaves, later boring into the top of the plant, 

 and at this date appear to be working down the 



Fig.4-J. Box Elder Twig in- , 

 jured by the Maple Borer, a ^i^*-'"- 



r;"e?riTa;Kiiat"s?age7of Manifestly collecting and burning infested 

 Injury. Original. twigs the latter part of June and during July 



would be a desirable way to lessen their numbers. From examination 

 of females sent him, C. H. Eernald believes this to be Froteoteras 



aesculanuni Riley. 

 7 



