Document zoekQQvX8agMg2v5Mp2b6XR07

iiarasn^TftiL kskhmce. sss. 9. 1S5.CH MAY 13 1969 _ Some Bird Species Milwaukee sehkei Called DDT Victims ~3 TET ' By QUINCY DADISMAN Sentinel Staff Writer drocarbon compounds widely, used In Industry. PCB's show-, MAY 1 4 1953 '-Madison, Wij, - A Califor tip in some test equipment in a t nia biochemist testified Mon* way that makes separation of' I day that his studies have con .DDT ia analysis much moie_ vinced him that DDT and not difficult another commonly found con taminant "the Cause-hf thift - Only Few Found *' eggsheiEsT whieS He Relieves 'Risebrough said that while By QUINCY DADISMAN some cases, he said, but they to control in New Jersey, he and had set out to see wh will wipe out certain predatory bird species. . J>CB'3 arc found in large amountsTn many marine birds,. he had found only a few in-, Robert Riscbrmigh, Berke which there were more PCB's.. ley, Calif., was called as an ad than DDT or its metabolites. verse witness by fat attorney (forms into which it changes in* defending thc-pctficidc at a passing through living tissue). natural fcsource department He said that tests with eggs, hearing bn a petition catling for banning DOT in Wisconsin. containing up to one part per, million (p.p.m.) of*PCB's and . . Testified EarUcr up to six p.p.m. of DDT in all Sentinel Staff Writer are not dependable for control said. He said mosquito control was wrong with the reports. Madison, Wis. - A New Jer ling crop pests. That method, was very important there be As a result, he said, he at sey entomologist told the \Vv he said, has been in use at least cause a reservoir of a mosquito several other scientists m t consin natural resource board since 1903. borne encephalitis exists with WARF laboratory perso hearing on a proposed ben on He said that the use of in the use of DDT Tuesday that he knew of no substitute for sect disease organisms had been tried but that cultures DDT for certain uses. could become contaminated Bailey B. Pepper. Edison, N. with other diseases and. in J.. who has headed the entc-, fact, one such material, used among New Jersey animals. It affects primarily horses and pheasants, he said, but human eases and deaths were report ed in 1S33, 1953, 1964 and 196S. n?i last January to work o ways of testing for polychlo nated biphenyls. The nc method, he said, rakes it ?: -ible to distinguish active the chemicals. mology department at Rutgers against Japanese beetles, was Pepper said he had heard of Risebrough had testified in December for the petitioners forms showed mathematically, -- Citizens' Natural Resource by correlation with eggshell association and the Wisconsin thickness that DDE and not chapter of the Izaak Walton PCB's,. were to "b Pam e.' The*" league -- about DDE. a form tests were made mathematical- ' into which DDT changes In liv ly. he said, with a statistical ing bodies and his conviction accuracy of 99.9%. ' that DDE causes a metabolic He said that damage to disturbance in birds which eggshells from DDT can **e leads to thin eggshells. . traced not only to the DDE in. The thin shell cracks easily, the bird's body fat. but also to causing the death of the em the amount present in .the food i bryo inside the egg. it eats. -* ,, Risebrough was called by "DDT may be comparatively 'Willard S. Stafford. Madison Inactive in the body fat." he , attorney who is conducting the concluded, explaining that per- i defense of DDT for the Nation c g r I n e falcons from Arctic al Agricultural Chemicals asso- areas seem to be sustaining ciatHm. . their numbers better than Stafford questioned RI s e- those from more temperate cli university since 19-11 andisa withdrawn from the market re outbreaks of St. Louis enceph former president of th? En*o- cently because the culture may alitis in the upp*r Mississippi rr.oiogiczl society of America, have been infected with an- valley, but he said he did not was called by opponents cf the thracnosc. a plant disease. believe the eastern variety of ban. He said he had worked with The cotton boll worm -- known as the tomato worm in the disease was found midwest. in the the-DDT since its introduction gardens and the corn ear worm Testing Explained in 1944 and still considered it :n cornfields -- is almost im an ''important weapon in the possible to control except by arsenal of insecticides." DDT, he said, although earlier Robert Risebrough.. a Cali fornia biochemist, returned to the stand briefly to explain his Pepper said he was familiar with all the methods proposed to combat insects -- insecti cides. biological, environmen witnesses said Sevin is used by most Wisconsin com growers. Sevin. however, poses hazards to nearby bee colonics. method of analyzing samples: for small amounts of po'y- chlorinated bipheejis^ chernic a 1 compounds which some tal and physical control'-, lam Although some insects have times interfere -with analyses practices and repellent' -- and developed a resistance to DDT, for DDT and its relatives. all pose problems. Pepper said it could be urd "Some Not Dependable" The use of biological con trols. principally predator/ in agamst them after several gen erations had passed and the re sistance had been diluted. Riscbrouc'i s;v'd that he had become dissatisfied with anal yses provided by tisc Wiscon sin Alumni Research Founda brough about work he his mates because the food they sects. has been succcr-fi'l in DDT is important in mosqui tion (WARF) Institute, Inc., done with polychlorinated bi- cat while rearing a second. phenyis (PCB). a of by- dutch of eggs is "dean.** | / HONS 031620