69 



Some evidence was obtained that Fuller's Earth washes have 

 certain advantages over lime washes, and attention is dra^n to the 

 advisability of further tests of washes containing naphthaUne. 



Stearns (L. A.) . Parasitism and Nicotine in the Control o£ the Oriental 

 Peach Moth : A Second Report. — //. Econ. Ent., Geneva, X.Y., 

 xiv, no. 4, August 1921, pp. 336-341. [Received 5th December 

 1921.] 



The oriental peach moth [Cydia molesta, Busck] is becoming 

 increasingly abundant in Virginia ; the lowest infestation recorded 

 for 1920 was 37 per cent., and in individual trees the injury reached 

 81 per cent, in some cases. Damage to late peach fruit was much 

 greater than in preceding years. A species of Macrocentnis is the 

 most abundant parasite and is apparently beginning to have as many 

 broods as its host, although up to the present no parasites have been 

 reared from overwintering larvae. This may be one of the causes of 

 the greater abundance of the pest in the summer of 1920. The list 

 of parasites reared was much the same as in previous years {R. A.E., 

 A, vii, 478]. During the summer of 1920 the tests with nicotine 

 [R. A.E., A, viii, 354] were continued on a larger scale, and the results 

 substantiate those obtained in earher experiments. Nicotine used 

 alone at a strength of 1-1,600 produced practically no check on the 

 hatching of the eggs, but its effectiveness was slightly increased by 

 the addition of a spreader composed of caseinate at the rate of 1 lb., 

 or sea moss at the rate of 2 lb., to 50 U.S. gals, water. A 1-800 dilu- 

 tion of nicotine reduced the hatching by about two-thirds, and a 

 1-500 dilution reduced it by about three-fourths. 



Experiments with a view to kilHng the young larvae by the addition 

 of an arsenical to the nicotine spray were not satisfactory, probably 

 owing to the larval habit of rejecting the first few mouthfuls of food 

 when entering twigs or fruit. 



Further observations show that the dates given in the previous 

 report [R.A.E., A, viii, 355] for the chief oviposition periods are 

 correct within seasonal variations. The last two broods overlap to 

 such an extent that the fixing of a date for a single spraying would 

 be impossible. 



MozNETTE (G. F.). U.S. Bur. Ent. Some Insect Problems confronting 

 the Avocado Grower. — //. Econ. Ent., Geneva, N . Y ., xiv, no. 4, 

 August 1921, pp. 341-344. [Received 5th December 1921.] 



A brief account is given of some of the more injurious pests of avocado 

 occurring in Florida and of remedial measures against them. The 

 pests dealt with are Tetranyclms yotJiersi, McG. (avocado red spider), 

 and Heliothrips hemorrhoidal is, Bch., against which spraying with 

 liquid lime-sulphur 1 to 50 with the addition of nicotine sulphate 

 (40 per cent.) at the rate of 1 to 900 to the diluted lime-sulphur, or with 

 nicotine sulphate, at the same rate, to 2 lb. of powdered lime-sulphur 

 to 50 U.S. gals, water, is advocated ; Frankliniella cephalica, Crawf., 

 which may be controlled by the addition of 2 to 3 lb. of soap to every 

 100 U.S. gals, of the above nicotine sulphate solution ; and Trialeiirodes 

 floridensis. Quaint, (avocado whitefly), Chrysomphalus dictyospermi, 

 Morg., and Pulvinaria {Protopidvinaria) pyriformis, Ckll., which may 

 be controlled with oil emulsion sprays [R.A.E., A, ix, 104]. For 

 T. floridensis two applications should be made, one in the spring 

 at a strength of 1 to 80, and another in the autumn at 1 to 70. 



