. Report of the State Entomologist of Connecticut for the year ... . 2 Ethylene dibromide, 10 per cent in a naphtha carrier. 56 lavae died within 10 days to three weeks even when stored in fresh soil fol-lowing exposure. Death appears to occur much sooner, usually in ahouteight to 10 days, when larvae are kept in treated soil continuously. With one pound of technical benzene hexachloride per acre as a start-ing point, field dosages were scattered about this point so as to include arange of from one-third to six pounds technical benzene hexachloride peracre. Four methods of application were sel
. Report of the State Entomologist of Connecticut for the year ... . 2 Ethylene dibromide, 10 per cent in a naphtha carrier. 56 lavae died within 10 days to three weeks even when stored in fresh soil fol-lowing exposure. Death appears to occur much sooner, usually in ahouteight to 10 days, when larvae are kept in treated soil continuously. With one pound of technical benzene hexachloride per acre as a start-ing point, field dosages were scattered about this point so as to include arange of from one-third to six pounds technical benzene hexachloride peracre. Four methods of application were selected for this preliminary work:row treatment, broadcast, seedpiece treatment and poison baits. Row Treatment The most effective method of application was row treatment in whichdilute dusts were placed in the open furrow by means of a rotary hand dusterprior to dropping the seedpieces. Dosages ranged from one-third to sixpounds of benzene hexachloride per acre. All treatments containing ormore pounds of material per acre resulted in almost perfect commercial. Figure 2. A. Typical tubers from untreated soil. B. Tubers grown on soil treated with approximately three pounds of benzenehexachloride, applied in the row. C. Peeled tubers from treated and untreated plots, showing the feeding channelsin the tuber flesh. 57 control in contrast with 71 per cent total injury and over 50 per cent out ofgrade tubers in untreated soils. Treatments containing less than pounds ofbenzene hexachloride per acre gave less control, in proportion to the amountof material applied, but in all cases were distinctly better than where notreatment was made. The field on which this test occurred was far moreseriously infested than average so that under more normal conditions thelower dosages might be expected to result in commercial control; that is, ona crop in which not more than 6 per cent by weight of the tubers are in-jured to the point of being thrown out of grade U. S. No. 1. Row treatment, th
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