118 INJURIOUS INSECTS OF 1904. 



Arnold Arboretum, and that it had been known about Boston and 

 Cambridge for many years, and Vol. VIII of Psyghe, 1899, states that 

 it was very abundant about Boston in 1896. In 1898 and 1899 it be- 

 came so injurious to Balm of Gilead Poplar and Willows in Massa- 

 chusetts as to seriously threaten the business of nurserymen in these 

 particulars. A report reaches us of the finding of one specimen in 

 Montana in 1899, but this report lacks confirmation. A few years 

 ago Burgess found it in Ohio. Dr. Howard reports receiving half- 

 grown larvae this summer from Detroit, Michigan. The above, with 

 the specimens which we received from Bowbells in the northwestern 

 part of North Dakota, indicate the westward march of this unwelcome 

 foreigner. 



Unfortunately, from the nature of the work of this insect, 

 which is not very evident until the resulting injury is seen, 

 most remedies or means of prevention are of but little avail ; never- 

 theless something can be done in alleviation, and in view of its recent 

 introduction into this part of the Northwest, radical measures should 

 be resorted to in order to prevent such a destructive insect getting a 

 foothold in this state. 



Eleanor Ormerod, in her report of 1899, advised her constituents 

 in England, where, by the way, the beetle has been known for a long 

 time as "The Mottled Willow Beetle," to apply repellant washes to 

 the trunks and branches of young trees, also to jar the trees, and 

 the destruction of infested branches in the spring. 



The writer has recommended the examination of nursery stock 

 and young door-yard trees in June, if the presence of this pest is sus- 

 pected, and the cutting off of the affected branches (or affected trunk 

 if it is a small tree) and burning the same with the culprit inside. A 

 possibly good preventive to young stock in the nursery or elsewhere 

 would be a whitewash on trunks and larger branches, containing a 

 liberal allowance of Paris green, applied two or three times during 

 May and early June, and again, since egg-laying has been observed 

 in the fall, in September. Jarring the trees during these two months, 

 May and June, in the morning, causing the beetles to drop on a 

 sheet below, is also suggested. The Agricultural Department recom- 

 mends putting newspapers about the bases of trees, and above these, 

 deterrent washes. Two parasites have been bred from this pest ; an 

 Ichneumon Fly, Ephialtes irritator, Fab., and Ermogastra hartii, Ashm. 



