ECONOMIC ZOOLOGY ENTOMOLOGY. 555 



bei* of these insects including Tipula oleracea, Traina troglodytes, Gortynn 

 ochracea, Vanessa cardiii, etc. 



A new species of Tyroglyphus injurious to onions, A. A. Elenkin (Zhur. 

 Bolyezni Rast., 1 {1901), Xu. 1-2, pp. 52-69, figs. 2).— Under thie name Tyro- 

 glyphns pUii the author describes as new a species of mite which attacks onions 

 but can not be reared on other bulbs or on cheese. The mites feed on the 

 whole interior of the onion bulb. No remedy is suggested. 



The sweet-potato borer, A. F. Conradi (Texas Sta. Bui. 93, pp. 16, figs. 6). — 

 CyJas formlvdvius was first reported in Texas in 1890. It has gradually spread 

 northward although the adults are readily destroyed by low temperatures 

 esitecially if unprotected. The insect is described in its various stages. On the 

 northern limit of the infested area there are four or more broods, while in south 

 Texas there are seven or more broods annually. The insect feeds upon sweet 

 potatoes, common species of morning glory, and to a less extent on other 

 plants. 



No evidence was obtained that the sweet-potato weevil ever uses its wings. 

 Its spread is, therefore, slow and gradual. Rotation of crops assists to some 

 extent in controlling the pest provided other measures of eradication are 

 adopted. Deep planted tubers are less infested than shallow planted tubers 

 but no variety has been found to be immune. Some of the weevils, but appar- 

 ently not all, may be destroyed by fumigation with carbon bisulphid in bins. 

 Storage bins at any rate should be made clean and clean tubers should be 

 separated from infested tubers. 



Infested tubers should not be fed raw to stock since the remnants may con- 

 tain enough larviB to cause serious infestation of the next crop of sweet potatoes. 

 The adults feed upon the vines to some extent and may be destroyed by spraying 

 with arsenicals. 



Codling' moth investigations during' 1903 and 1904, F. GARcfA (New 

 Mexico Sta. Bui. 65, pp. 20, clgins. 3). — Extensive records kept by the author 

 show that the first brood from the overwintering larvae and the partial third 

 brood are very small while the second brood is large. The period for each 

 brood is about 50 days. The different broods overlap one another greatly. 

 The weat-her had little effect upon the time of appearance of the moths. The 

 first brood of moths appears about the same time as the blossoms. 



The codling moth in eastern Washington, A. L. Melander and E. L. Jenne 

 (Washington Sta. Bill. 81, pp. 2-'i, figs. 1). — In previous experiments at the 

 station it was shown that arsenate of lead was the most effective of the 

 arsenicals tried in combating the codling moth and that 4 sprayings were as 

 effective as 12. During the past summer different brands of arsenate of lead 

 have been tested on 125 acres of commercial orchards. The total cost of making 

 4 applications to 1 orchard of 20 acres was $116. All of the brands of arsenate 

 of lead were found to be quite efficient. 



It is recommended that arsenate of lead be applied at the rate of 1 lb. to 

 40 gal. of water. Four applications are recommended, the first just after the 

 blossoms fall, the second 3 weeks later, the third at some time from July 15 to 

 August 10, and the fourth about a month later. The first application is the 

 most important but the others are also necessary. Thorough cultivation is of 

 much importance and the spraying must be done thoroughly and at times when 

 the poison will be effective in destroying the larvae. 



Report of the commissioner for the suppression of the g'ipsy and brown- 

 tail moths, 1906, A. E. Stene (Providence, R. I., 1907, pp. SO, pis. 28, maps 

 3). — A general historical account is given of the introduction of the gipsy moth 

 into Massachusetts and its spread to other States. The moth is described and 

 25729— No. G— 08 5 



