6B2 EXPERIMENT STATION BECORD. 



Cleonus punctiventris and means of combating it, V. Pospyelov (VyestniJ: 

 Sakh. Proiiiuish., 1906, No. 6-S; abs. in Zliiir. Oimitn. Agron. [Rvss. Jour. Ecpi. 

 Landic], 8 (1901), No. 1, pp. 102-105).— The beetle hibernates in the soil to a 

 depth of 14 in. or less. According to the author's observations beetles which 

 appear in the fall do not deposit eggs the same year. A number of natural ene- 

 mies of Cleonus are known but the chief reliance must be placed on artificial 

 remedies such as hand collecting, spraying with Paris green and barium chlorid, 

 and trapping beetles in ditches. 



Note on the cotton failure on account of bollworm in the Central and 

 Southwest Punjab in 1905, and on the results of the measures taken to 

 prevent a recurrence in 1906, W. Renouf (Dcpt. Agi: Punjab BiiJ. 1, 1907, 

 pp. 13). — The most injurious bollworm in Punjab is Earkis insulana. A system- 

 atic attempt is being made to control this pest. The remedial measures which 

 have given favorable results are destruction of old cotton stalks, plowing the 

 cotton fields, the use of Hibiscus esciilentus as a trap crop, and the introduction 

 of parasites. 



The potato plant louse, Edith M. Patch {Maine 8ta. Bui. llfl, pp. 235-257, 

 figs. 9). — During the summers 11X)4-190G, Nectaropliora solanifolii caused great 

 injury to potatoes, especially in Aroostook County, Maine. Badly infested stems 

 were killed for a distance of 4 to 6 in. at the tips. In some seasons predaceous 

 and parasitic insects and fungi hold the potato plant lice in check. If this 

 should not occur it is possible that an application of kerosene emulsion or a 

 similar insecticide would destroy them. The effect of this treatment upon 

 potatoes, however, is not known, and it was thought desirable, therefore, to 

 study the life history of the insect with the view of learning some ocher means 

 of control. 



It was found that the plant lice appear in July, become most numerous toward 

 the last of August, and begin to migrate toward the middle of Sejtteuiber. The 

 alternate host is the shepherd's purse aud possibly other related plants are 

 utilized for this purpose. It is recoumiended, therefore, that such weeds be 

 destroyed in potato fields by fall plowing or other meaus and that the precau- 

 tion be taken of removing all belated potato tops which may serve as food for 

 the plant lice. Notes are given on the natui'al enemies of the potato plant louse 

 and the insect is described in its various stages. 



The codling moth, R. S. Woglum (.A^ C. Dcpt. Agr. Ent. Circ. 20, pp. 16, 

 figs. 7). — In North Carolina as in many other States the codling moth is the 

 most destruclive insect pest of the api)le. There are 2 broods annually, the 

 second being the more injurious. The first brood may be controlled by spraying 

 immediately after the blossoms fall with arsenate of lead or Paris green in 

 water or in Bordeaux mixture. The best results have been obtained from the 

 use of arsenate of lead in Bordeaux mixture. The numbers of the second brood 

 may be considerably reducetl by the use of bands which should be examined 

 every 10 days and by supplemental spraying with the insecticides reconnnended 

 for the first Itrood. 



Petroleum emulsion for the San Jose scale, C. D. Jarvis {Connecticut Storrs 

 Sta. Bui. .'i9, pp. 12). — Excellent results have been obtained from the use of 

 lime-sulphur wash in controlling San Jose scale, but it was thought desirable to 

 carry on experiments with soluble oils since these insecticides offer fewer ditti- 

 culties in their application. The jn-oprietary soluble oils cost, when diluted, 

 about 3 cts. a gallon and are, therefore, considered too expensive. An attempt 

 was made to prepare a soluble oil at a more reasonable cost. 



For this purpose an emulsifier is made containing carbolic acid, fish oil, 

 caustic potash, kerosene, and wiiter, the first three being heate^l to a tempera- 

 ture of 300° F., after which the kerosene and water are immediatelv added. 



