260 EXPEEIMEKT STATION RECORD. 



Eradication of the southern cattle tick, B. H. Ransom (Ad^mnce print from 

 Proc. 7, Internat. Zool. Cong. 1907, pp. 8 [puh. 1910]).— A brief account of the 

 work of eradication of Margaropus annulatus being carried on by this 

 Department, 



[Observations upon Filaria (Microfilaria) philippinensis], P. M. Ashbtjrn 

 and C. F. Craig {Abs. in Jour. Trop, Med. and Hyg. [London], 12 {1909), No. 

 11, pp. 167, 16S, fig. 1; Bui. Inst. Pasteur, 8 (1910), No. IJf, pp. 633, 634).— 

 The authors have found that no development of this fllaria takes place in 

 Stegomyia calopus. In CuJex fatigans, its complete development was observed 

 up to the time it became lodged in the mosquito's labium. 



Fumigation dosage {Massachusetts Sta. Rpt. 1909, pt. 1, pp. 214-2Jf7)j — 

 Greenhouse fumigation experiments with hydrocyanic-acid gas conducted under 

 the direction of and including introductions and notes by H. T. Fernald are 

 here reported. A general summary of the conclusions has been previously 

 noted (E. S. R., 22, p. 259). 



Tomatoes, by W. V. Tower (pp. 214-227). The details of 16 experiments 

 conducted to determine the effect, under varying conditions of light, tempera- 

 tui-e, and humidity, of hydrocyanic-acid gas upon tomatoes grown under glass 

 are reported. It is concluded that prolonged exposures to weak strengths of 

 the gas are more liable to cause injury to the plants than are shorter exposures 

 to greater strengths. Until it is determined whether short exposures to greater 

 strengths would be effective against the greenhouse white fly and thrips, it is 

 thought that the best treament for the white fly on tomato plants is to fumigate 

 them with a strength of 0.015 gm. of potassium cyanid per cubic foot for a 

 period of from 45 minutes to 1 hour, on a dark — moonlight, or perfectly 

 cloudy — night, in a house where the humidity is below 70° F. at the beginning 

 of the treatment. 



Cucumbers, by C. W. Hooker (pp. 227-247). The same general plan was 

 followed in the experiments with cucumbers, and the details are presented for 

 a total of 37 experiments in each of which 4 plants, 2 of Rawson Hothouse and 

 2 of White Spine varieties, were used. The best results wore obtained by 

 fumigating on clear, starlight nights with little or no moonlight, and on dry, 

 cloudy nights. A small amount of potassium cyanid with a longer exposure 

 seemed preferable to a large amount for a shorter exposure. 



A comparison of the results of the experiments on cucumbers with those on 

 tomatoes indicates that the former are much the hardier, successfully resisting 

 more cyanid and longer exposures. 



Papers on deciduous fruit insects and insecticides. — The one-spray method 

 in the control of the codling moth and the plum curculio, A. L. Quaintance 

 ET AL. (C7. S. Dept. Agr., Bur. Ent. Bui. 80, pt. 7, pp. U6, pis. 2, figs. 5).— The 

 authors here report in detail upon investigations conducted during the season 

 of 1909 to determine the relative value in the control of the codling moth and 

 plum curculio, under eastern conditions, of the one-spray method in compari- 

 son with a schedule of applications requiring a total of from 3 to 5 treatments 

 according to locality and representing practically the method of spraying con- 

 sidered best for the localities in question. " The so-called one-spray method 

 of spraying for the codling moth on apples consists essentially in making the 

 application following the dropping of the petals so thorough that it will result 

 in the practical extermination of the first brood of larvae, subsequent treat- 

 ments, therefore, becoming unnecessary." The work was carried out in Vir- 

 ginia, Ai-kansas, and ISIichigan, and included 4 orchards, with a considerable 

 range in climatic conditions. 



