548 EXPERIMENT STATION RECORD. [Vol. 41 



The family name of the American wood warblers, H. C. Oberholser {Proc. 

 Biol Soc. Wash., S2 {19 lU), p. 46). 



A dangerous snail introduced in California, G. R. Gorton (Mo. Bui. Cal. 

 Com. Hort., 8 (1919), No. 1, pp. 7-10, figs. 5). — The author records the occur- 

 rence of Helix- pisana at La JoUa in San Diego County, where it is confined al- 

 most entirely to a small canyon extending upward from the ocean about three 

 city blocks in length, and to some level ground contiguous thereto. Because of 

 its known destructiveness in the Mediterranean region, where it attacks both 

 field and orchard crops, especially the buds and blossoms of citrus fruits, foliage 

 of olives, loquats, etc., attempts are being made to eradicate it. 



In an appended note H. S. Smith calls attention to a report by De Stefani' on 

 the status of the pest in Sicily. 



Report of entomolog'ist, J. R. Watson (Florida Sta. Rpt. 1918, pp. 56-61). — 

 In control work with cyanamid for root-knot nematodes, in continuation of the 

 work previously noted (E. S. R., 39, p. 461), very serious burning resulted, not 

 only to the first crop of celery set out one month after application but to an- 

 other set out three months after treatment at Sanford and Bradentown. The 

 only explanation of the diversity of results obtained in the two years is that 

 there was a difference in the cyanamid used. Thus it appears that a ton per acre 

 is too heavy a dose to be always safe. No such results were noted in the plats 

 at the station farm even when the material was applied at the rate of 3 tons 

 per acre. 



In the experimental work during the year sodium cyanid was used at the rate 

 of 100 to 800 lbs. per acre, followed at once by the application of ammonium 

 sulphate in solution, using 1.50 per cent of the weight of the sodium cyanid. 

 The results are said to parallel quite closely those obtained with cyanamid and 

 the cost to be considerably greater than that of the latter. " Even 800 lbs. per 

 acre did not entirely exterminate the nematodes, but did reduce their numbers 

 to such an extent that they did not again reach desti'uctive abundance for 

 nearly a year. On the plats receiving 300 lbs. or less iier acre there was no 

 noticeable decrease in the number of nematodes." 



In experiments with summer fallow for nematode control the results were 

 about equal to those obtained by the use of 600 lbs. of cyanid or a ton of cyana- 

 mid per acre. 



It was found that the hibernation of Nezara viridida is incomplete. Many 

 individuals, however, truly hibernate while others remain all winter on green 

 plants, usually actively feeding although they are quiescent during the coldest 

 weather. 



The importation of Delphasius caialinw from California was continued dur- 

 ing the year, and in at least three groves the beetles maintained themselves 

 throughout the winter and increased at a satisfactory rate. 



Other insects of the year mentioned are a plant bug (Adelphocoris rapidus), 

 which attacked cotton squares; the sweet-potato cateii^illar (Prodenia sp.) ; 

 the woolly white fly (AJenrothrixiis hoivardii), reported for the first time from 

 St. Lucie County; the broad-nosed weevil (Epicwriis fonnidulosus), received 

 from Jensen ; a slug (Tagimdus floridensis), which was a source of considerable 

 damage to tomatoes at Dania ; the big yellow plant bug Corecoris conflnentus, 

 which severely injured tomatoes at Bokelia ; the Colorado potato beetle re- 

 ceived from Panama City, which is the first report from the Gulf coast of 

 Florida though recorded from many of the northern tier of counties ; the boll- 

 worm, which mined in the buds of geraniums at Vero; a tree hopper (Platy- 

 corus Jf-vittata), which infested oaks, especially live and water oaks, and was 



^ Helix pisana and the Damage Which It is Capable of Doing to Agriculture (Palermo, 

 Sicily, 1913). 



