REPORT OF STATE ENTOMOLOGIST 1899 



545 



was reported very abundant at Union Springs by J. Jay Barden and as 

 present at Auburn by Joseph Foord. Much damage was said to have 

 been caused in the former locality, but later this report was modified as 

 the injury proved to be less than was at first supposed. Livingston 

 county: W. R. Houston reported the cicada to be in numbers at 

 Geneseo, present at Groveland and very abundant at Avon. Monroe 

 county: Lewis Hooker found it at Rochester and M. S. Baxter sent in 

 specimens from Penfield. Onondaga county : Miss A. M. Armstrong 

 found it in large numbers at Syracuse. Yates county : Cyrus Crosby 

 reported the cicada present in greater or less numbers at Dresden, 

 Bellona, Long Point and Mays Mill. 



Drepanosiphum acerifolii Thos. The drouth, specially in the 

 western part of the state, has apparently been very favorable to this 

 beautiful species. At Onondaga Valley, Syracuse, in early September 

 many maple leaves had fallen, those in the upper portions of the trees were 

 badly curled and much honeydew was seen on the foliage. The trees 

 proved to be badly infested with this plant louse, which was doubtless at 

 least partly responsible for the bad condition of the trees. At Batavia 

 many infested maples were seen but the injury was not so great as at 

 Syracuse. The work of this species was also observed at Amsterdam 

 and in Albany, but it was doing less damage in the latter place. A few 

 Syrphid larvae were found on the infested trees. 



Experiments with arsenical poisons. Comparative experiments 

 with a few of the more important arsenical poisons were conducted last 

 spring in connection with field observations. Vigorous elm leaf beetles, 

 Galerucella luteola Mull., were collected May 4 and 10 placed 

 in each of six breeding cages. All were provided with twigs of English 

 elm bearing tender leaves. The ends of the twigs were placed in small 

 bottles of water in order to keep the foliage fresh. All were treated 

 alike, except that the leaves in cages no. 1-5 were thoroughly sprayed 

 with poisons as given in the table below. An atomizer was used for 

 spraying and whenever it was found necessary to renew the leaves, 

 because of their wilted condition, the foliage was treated as at first and 

 the spray allowed to dry before the fresh food was placed in the cage. 

 This prevented any disturbance in feeding owing to the leaves being 

 wet. In starting the experiment, the sprayed leaves were placed in the 

 cages wet because that would be their condition after spraying outdoors, 

 though in most cases the water would evaporate much more quickly 

 than in the cages. 



