175 



gen3ration a year. It should be possible to control the pest by dusting 

 with powdered lead arsenate and sulphur in the ratio of 1 to 10. 



Phorodon hmmli, Schrank (hop aphis) in the eastern United States 

 has been found to winter only in the egg-stage on plum. On the hop 

 the winged forms are found on the under-side of the topmost leaves, 

 the wingless descendants from these also Hving on the underside oi 

 the tender foliage. A\nien the young hops are formed the Aphids 

 migrate to them in large numbers. Two spe'cies of ants have been 

 found associated with P. humuli, viz. : — Formica fusca var. subsericea, 

 Say, and Prenolepis imparis, Say. Injury to the hop consists in the 

 weakening of the vines and the stunting of the hop cones, and in the 

 attack of a fungus [Cladosporium) in the honeydew coatmg the plant. 



Predatory natural enemies include the Coccinellids, Adalia 

 bipunctata, L., Hippodaniia convergens, Guer., H. parenthesis, Say, 

 Coccinella trifasciuta, L., C. novemnotaia, Hbst., C. sanguinea, L., 

 and Anatis quinqxedecimpunctata, Oliv. ; the Syrphids, AllograptM^ 

 obliqua, Say, and Syrj^hus aniericanus, Wied. ; and Chrysopa oadatu, 

 Say, and Hemerobius stigmaterus, Fitch. One Braconid parasite, 

 Praon sp., has been bred from the hop aphis. 



The control recommended for this Aphid consists in spraying in the 

 last week of June or the first in July with nicotine sulphate (r-2,000, 

 or I pint to 100 gals.) and soap (4-100). The soap should be melted 

 in quantity, a large iron kettle being convenient for this purpose. 



Tetranychus telarius, L., has occasionally appeared on hops in New 

 York, but has never caused serious damage, and in view of the short 

 growing season and the cold winters it is not hkely to become a serious 

 pest. 



The butterflies, Polygonia interrogation is, F., and P. comma, Harris, 

 are not of economic importance, only shghtly injuring the leaves, 

 and they are held in check by a Chalcid, Pferomalus vanessae, Harris. 

 Other minor insect pests of the hop are Empoasca flavescens, F., and 

 E. flavescens birdi, Goding (leaf-hoppers) ; Agromyza sp. (leaf-mmer) ; 

 Psylliodes pufictidata, Melsh., and other flea-beetles ; Tortrix {Archips) 

 rosaceana, Harr., and T. {A.) argyrospih, Wlk. (leaf -rollers). 



Dudley (F. H.). Report of State Horticulturist. Insects and Diseases 

 of Fruit and Tree. — 16th Ann. Rept. Commissioner Agric. State of 

 Maine, 1917 ; Waterville, 1918, pp. 45-54, 1 plate, 5 figs. 

 [Received 10th February 1919.] 



Tortrix {Cacoecia) cerasivorana (cherry-tree ugly-nest Tortricid) 

 is a very destructive pest that occurs from the 1st to 15th July upon 

 choke-cherry and sometimes upon cultivated cherry. The larvae 

 fasten together all the leaves and twigs of a branch and feed upon 

 them, an entire brood occupying a single nest, within which they 

 pupate. All nests should be cut and burnt, and all foliage sprayed 

 with lead arsenate paste, 2 to 3 lb. to 40 U.S. gals, water. The young 

 larvae of Pissodes strobi (white-pine weevil) bore into the tender tops 

 of the trees and eat downwards, rendering it necessary to cut away 

 and burn the infested part. The apple curculio [Anthonomus 

 quadrigibhus\ which hibernates in the adult stage, punctures the 

 yomig apple and feeds on the pulp, causing great injury and deformity 

 of the fruit. To control this pest 2 or 3 applications of lead arsenate 



