Document N2xBVavYond2L43xnwJ5G2XvR

________ WLWAHKEE SElinHEL NUMUXEE. WSC. a KMit. t , MAY 13 1969 ................. - ' - .. Some Bird Species Called DDT Victims ` MILWAUKEE SEJiMEL MILWAUKEE, WSC. a mon By QUINCY DAIHSMAN drocaiboa compounds widely':: ScntinW Staff Writer used In industry. PCS'* show* w Madison, Wta. - A Califor up hi some test equipment tii W, nia biochemist testified Mon- way that makes separation of* j day that his studies have coo .DDT in analysis much more, . voiced him that.DDT and oot difficult * -*-# another ^""Hy f?"**1 Only Few Found * MAY 14 1969 ^ pJPJDT Invaluable, Scientist Se eggshells which be believes Risebrough said that whfle By QUINCY DADISMAN some cases, he said, but they to control in New Jersey, he and had se. will wipe out certain predatory PCB' are found In large Sentinel Staff Writer are not dependable for control-1 said. He said mosquito control was wrong - bird species. . umountS in many marine birds,. he had found only a few In Robert Risebrough, Babe* which there were more PCB's., ley, Calif., was called as ao ad* than DDT or its metabofittes. versa witness by thd attorney (forms Into which It changes far defending t h o.flcftfeidc at a passing through bring tissue).' natural fesource-fepartment hearing Oa a petition caling He said that tests with eggs, for banning DOT in .Wisconsin. containing op to one part per million (p.pjn.) of PCB's and. Testified Earlier up to six p.pjn. of DDT in all Risebrough had testified hi December for the petitioners forms showed mathematically, . -- Citizens' Natural Resource by correlation with eggshell association and the Wisconsin thickness that PDF, and not chapter of the Izaak Walton PCfili. were to blame. The league -- about DDE, a form tests were made mathematical* ' into which DDT changes In liv ly, he said, with a statistical Madison, Wis. - A New Jer ting crop pests. That method,, was very important there be As a res^ sey entomologist told the Wis* he said, has been in use at least; cause a reservoir of a mosquito several otre consin natural resource board since 1908. borne encephalitis exists with WAR F hearing on a proposed ban .on the use of DDT Tuesday that he knew of no substitute for DDT tor certain uses. Bafley B. Pepper, Edison, N. X, who has headed the ento He said that the use of in sect disease organisms had been tried but that cultures could become contaminated with other diseases and, in fact, one such material, used among New Jersey animals. It affects primarily horses and pheasants, he said, but human cases and deaths woe report ed in 1933, 1959, 1964 and 1968. _ nel last Jar ways of tes . nated bip method, he ^ sible to d:;the chemicc mology department at Rutgers against Japanese beetles, was Pepper said he had heard of university since 1941 and is a withdrawn from the market re outbreaks of St Louis enceph former president of the Ento cently because the culture may alitis in the upper Mississippi mological society of America, have been infected with an- valley, but he said he did not was called by opponents of the thracnose, a plant disease. believe the eastern variety of Kan The cotton boll worm -- the disease was found in the He said he had worked with known as the tomato worm in midwest ing bodies and his conviction that DDE causes a metabolic disturbance in birds which leads to thin eggshells. . The thin shell cracks easDy, causing the death of the em* I bryo Inside the egg. / Risebrough was catted by ! Willard S. Stafford. Madison attorney who Is conducting the defense of DDT for the Nation* al Agricultural Chemicals asso ciation. . Stafford quBHfsocdRIse- accuracy of 99.9%. . He said that damage to eggshells from DDT caa '* traced not only to the DDE in, the bird's body fat but also to the amount present in the food Heats. 1-- **DDTmaybe comparatively inactive m the body fat." bo concluded, explaining that per* e g r I a c falcons from Arctic seem to be sustaining g' m b e r s better than s from more temperate cU-' the DDT since its introduction gardens and the corn ear worm in 1944 and still considered It ; m cornfields -- is almost im an "important weapon in the possible to control except by arsenal of insecticides." DDT, be said, although earlier Pepper said he was familiar witnesses said Sevin is used by with all tiie methods proposed most Wisconsin com growers. to combat Insects -- insecti Sevin, however, poses hazards cides, biological, environmen to nearby bee colonies. - tal and physical controls, farm Although some insects have practices and repelIants -- and developed a resistance to DDT, all pose problems. , Pepper said it could be used I "Some Not Dependable** against them after several gen I The use of bioiogical con erations had passed and the re trols, principally predatory in sistance had been diluted. Testing Explained Robert Risebrough. a Cali fornia biochemist returned to tiie stand briefly to explain his method of analyzing samples for small amounts of poly chlorinated biphenyls, chemt811 Ofonpoupos wnicn some times interfere .with analyses for DDT and its relatives. Risebrough said that he had become dissatisfied with anal yses provided by the Wiscon sin Alumni Research Founda MCi bmugh*j.bout work he has t because the food they sects, has been successful in DDT is important in mosqui tion (WARE) Institute, Inc., done with polychlorinated bi r h 11 c rearing a second. phenyls (PCB), a gbiip of by- i of egg* is "dean." * | J