1917] ECONOMIC ZOOLOGY ENTOMOLOGY. 761 



were also tested, and all individuals of the former were dead in less than 48 

 hours, but the latter was not susceptible to the disease. 



The azalea lace bug, Stephanitis pyrioides, E. L. Dickekson and H. B. 

 Weiss {Ent. News, 28 {1911), No. S, pp. 101-105, pi. 1).—A report of studies of 

 the morphology and biology of this tingitid which has recently become abundant 

 and widespread enough in New Jersey to do considerable damage to azaleas. 



This species, which was originally described by Scott from Japan in 1874, 

 is said to have been introduced into New Jersey in the egg stage on evergreen 

 azaleas from that country. It is also known to occur at Bala, Pa., and Wash- 

 ington, D. C, and in Holland. Tlie nymphs and adults feed on the uudersurface 

 of the leaves, abstracting the sap and causing a discoloration of the foliage on 

 the upper surface. In severe infestations the leaves become almost white, 

 many of them drying completi-ly and dropping off. The underside of the leaves 

 is disfigured by the insect's excrement. 



In central and southern New Jersey, the egg. in which stage the winter is 

 passed, hatches the latter part of May. The length of each of the five nymphal 

 stages varies from three to six days. The appearance of the adults the latter 

 part of June is closely followed by oviposition which lasts for a period of two 

 weeks. These eggs require on an average two weeks for hatching. Growth is 

 completed by the last week in July and the first week in August and many 

 new adults are present. During the first two weeks of August eggs are again 

 laid and by the middle of and last week in September many adults of this brood 

 are present, the overwintering eggs being deposited at this time and during 

 the first part of October. Thus there are three broods in southern New Jersey, 

 the average length of each being about one month. In the central and northern 

 parts of the State, however, there are only two and a partial third. 



The lace bug on azaleas may be controlled by spraying with whale-oil soap 

 at the rate of 5 or 6 lbs. to 50 gal. of water, preferably shortly after the over- 

 wintering eggs have hatched. 



The Cicadellidae of Wisconsin, with description of new species, J. G. 

 Sanders and D. M. DeLong (Atm. Ent. Soc. Amer., 10 {1917), No. 1, pp. 79-97, 

 figs. 49). — The authors list 206 species and varieties representing 38 genera, of 

 which 13 species are described as new. 



Spraying for apple sucker (Psylla mali), F. R. Petherbrirge {Ann. Appl. 

 Biol., 2 {1916), No. 4, pp. 280-234). — " These experiments indicate that lime and 

 salt [lime 150 lbs., salt 30 lbs., and water 100 gal.] may be effective la pre- 

 venting a large proportion of apple sucker eggs from hatching. Lime wash was 

 also fairly effective. Soft soap and nicotin, or treacle and nicotin, were the 

 most effective after the suckers had hatched. Spraying to prevent the eggs 

 from hatcliing is not sufficient to keep this pest under control, but should be fol- 

 lowed by an application of nicotin and soft soap, or treacle and nicotin, to 

 kill those which have hatched." 



Some observations on the egg of Psylla mali, A. H. Lees {Ann. Appl. Biol., 

 2 {1916), No. 4, pp. 251-257, figs. 9).— A brief report of a morphological and 

 embryological study. 



Plant lice on potatoes, W. R. Brown {Rural New Yorker, 76 {1917), No. 

 4446, p. 1055, fig. 1). — This records serious injury to the potato in Hampshire 

 County, Mass., by the potato aphis during the summer of 1917. 



An instance is cited of a promising 8-acre field which was killed by the plant 

 lice before the tops were half grown. The first application of blackleaf 40 was 

 inefficient due to too great a dilution. The second application killed the apliids, 

 but the plants had been so weakened by the lice and the turning of the potato 

 tops with a hand rake in order that the spray might hit the underside of the 

 leaves that they died in a short time. 



