REPORT OF THE STATE ENTOMOLOGIST 363 



Drepanosiphum acerifolii TIws. This beautiful species occurred 

 quite commonly in small numbers on the tender leaves and growing tips 

 of the silver or white maple, Acer dasycarpum. It was rarely sufficiently 

 abundant to cause any material harm., and is mainly interesting on account 

 of its beauty and comparative rarity. 



Aphis mali Fabr. The apple-tree aphis was extremely abundant in 

 many localities in the state, early in the season, but in most cases the 

 ravages of this pest were checked by its natural enemies before any 

 extensive damage was caused. In the nursery center of Rochester and 

 vicinity, the unusual multiplication of this insect imposed a large amount 

 of work on those starting young trees. In some instances it was found 

 necessary to treat the young stock growing from grafts two or even three 

 times with kerosene emulsion, whale oil soap solution or tobacco water in 

 order to keep the pests under control. Most of the nurserymen found 

 the dipping of the slender trees into a vessel of the insecticide an easier 

 and more effective method than spraying. 



Myzus cerasi Fabr. The cherry-tree aphis was reported as very 

 injurious in several localities in the state, causing the leaves to curl and 

 shrivel. 



Myzus ribis Linn. The currant aphis Avas brought to notice early 

 in June in several localities, through complaint made of its abundance 

 on the leaves of currant bushes. 



Rhopalosiphum species. An aphid was found June 14 thickly 

 infesting some of the leaves and fruit of a plum-tree belonging to Mr H. 

 A. Unger of East Greenbush, N. Y. They swarmed on the leaves and 

 literally covered portions of the young fruit. Examples were sent to 

 Washington for identification, where they were examined by Mr Pergande. 

 He was unable to refer them to any known species, but thought that they 

 might possibly be an undescribed species of Khopalosiphuni. 



Thrips tabaci Lind. 

 The work of this insect, commonly known as the onion thrips, was 

 observed in August last at Newark, N. Y. The leaves of the infested 

 onions were badly blasted, and the crop, it was thought, would be 

 reduced one third. This pest was also found on the lower leaves of an 

 adjoining cabbage field, but not in very large numbers. 



