ENTOMOLOGY. 467 



Cottonwood-leaf beetle; green arsenite, V. H. Lowe {Neiv York 

 State Sta. Bui. 143, pp. 23, pis. 6). — The results of a study of Linascripta 

 in its relation to the willow industry of the State during the last 2 

 years. During this time and the 2 years preceding the beetle in both 

 adult and immature stages caused very serious injury to the willow 

 industry by attacking the willow whips, causing them to branch and 

 thus making them untit for bavsket purposes. In experimental fields 

 the willows were successfully, protected by 3 applications of green 

 arsenite in the proportion of 1 lb. to 100 gal. water. Other mixtures 

 were also tried, among them green arsenite and whale oil soap, 1 lb. of 

 the latter being added to each 20 gal. of the mixture of the former. 



Machines are figured and described which consist of a boat-like 

 receptacle in which water is placed and covered with a film of kerosene; 

 tbe beetles and larvae are knocked into this receptacle as the machines 

 are pushed or dragged between the rows of willows. The author 

 recommends spraying the young trees until they are large enough for 

 the machines, and using the machines after the trees are too high for 

 thorough spraying by ordinary means. The importance of united 

 efforts by willow growers is pointed out. 



Green arsenite or Scheele's green, with which the experiments were 

 made, is thought superior to Paris green ; for in addition to its low cost 

 it remains in suspension longer. When Paris green is mixed with water 

 at the rate of 1 lb. to 150 gal. it sinks to the bottom within about 5 

 minutes, but green arsenite will remain in suspension for over 2 hours. 

 The use of lime with the poison is recommended. 



Plant lice — descriptions, enemies, and treatment, V. H. Lowe 

 {New York State Sta. Bui. 139, pp. 646-664, pis. 4). — The bulletin dis- 

 cusses the classification and life history of plant lice, how they obtain 

 their food, their natural enemies, remedies used in combating them, etc. 

 The species of plant lice which were under observation are Hyalopterus 

 pruni and Myzus ribis. The former are abundant on the plum and the 

 latter on the currant. These are described, their distribution, life his- 

 tory, and food habits are noted, and partial bibliographies of each are 

 given. Other species of plant lice attacking the plum and current 

 are noted. 



Among the natural enemies of plant lice the author considers the 

 following predaceous insects: Anatis oeellata, CoceineUa 9-notata, Ad alia 

 bipiinctata, Megilla maculata, an undetermined beetle, larva 1 of the 

 syrphus fly, and aphis lions, and the following parasitic insects: 

 Aphidiu8 polygonaphia, Pachyneuron aphid ivo) us, and Isocratus vulgaris. 



Experiments were conducted in spraying with whale-oil soap, on 

 which the following recommendations are based: 



"Do not wait for the leaves to become curled, but spray thoroughly as soon as the 

 first few lice are observed. Much depends upon the thoroughness of the first appli- 

 cation. Direct the spray from below so as to drench the under surface of the leaves. 

 Use a solution of good whale-oil soap, not weaker than 1 11>. to 7 gal. of water. 



