Document RknNMaEj21egzZeEXQ2bbpjn

BETTIE SMITH staff associate PUBLIC AFFAIRS DEPARTMENT ) BORDEN INC 030 M STREET N W. ^WASHINGTON, D. C. 2003* 2QZ-29S-330B 1 BOR 007187 4 DDT EFFECTIVE ON TUSSOtK MOTH0 NIOSH RECOMMENDS SUBSTITUTE PESTICIDE `PROMISING' JOB CRITERIA FOR The recent treatment with DDT of population did not develop as ex BENZENE, AMMONIA nearly 410.000 acres of Pacific North pected. Occupational exposure limits for west fir forests infested with tussock However, entomologists are contin benzene and ammonia have been rec moths is a resounding success, ac uing to watch the region to forestall ommended by the National Institute cording to the U.S. Forest Service. a new outbreak. for Occupational Safety and Health to The agency also reports encouraging According to Mr. Graham, all for the Occupational Safety and Health results from its tests for a DDT sub ests treated had high insect popula Administration. stitute. tions that were quickly and effectively For benzene, a maximum exposure David Graham, tri-state coordinator reduced by the DDT. of 25 parts per million in a sampling for the massive undertaking, says al Areas dosed with DDT were com time of 10 minutes is suggested, with most all affected areas have been pared with other infested forests left 10 ppm as a time-weighted average sprayed. The Environmental Protec untreated for environmental and re recommended for a 10-hour workday. tion Agency relaxed its ban on DDT search reasons. NIOSH's criteria document for am last spring when other methods failed The number of insects was deter monia recommends limits of 50 ppm to control the moths. mined on check trees in both treated in a five-minute period. Preplacement A continuous surveillance system and untreated timberlands 24 to 72 medical examinations would be re made it unnecessary to treat several hours before spraying and four days quired for anyone who might be ex thousand acres on which the insect afterwards. Preliminary data shows: posed to ammonia concentrations ex- Larvae per 1000 square inches of foliage ceedinq 50 pom Treated Trees Untreated Trees PLASTICS ENGINEERS PLAN VC CONFERENCE Acres The Society of Plastics Engineers Area Trested Pre-Spray Post-Spray Pre-Spray Post-Spr will host a conference for vinyl chlo Colville, Wash. Pomeroy, Wash. La Grande, Ore. Halfway, Ore. Wallowa, Ore. St. Joe, Idaho Sawtooth, Idaho 176,000 16,400 27,500 34,900 78,300 75,300 1,100 69.7 17.0 25.7 28.0 49.0 27.0 10.1 2.0 0.2 0.3 0.5 0.5 0.5 0.4 44.6 6.0 23.1 15.6 49.0 10.5 10.0 25.2 3.0 8.8 11.3 26.8 9.4 4.2 ride monomer processors on the his tory and current aspects of the chem ical October 31-November 1, in New York City. The program will include a review of government regulations on VCM as applicable to industry, methods of de tection and monitoring and techniques Total 409,500 32.4 0.6 22.7 12.6 to reduce exposure. Medical aspects Natural predators and biologies factors account for the decline c moths in untreated areas. Further evaluations of effectivenes will be made in the fall when all insee will not be discussed in detail. Interested parties should contact A. \E. Whitney Jr., Goodyear Tire & Rub ber Co., P.O. Box 2023, New Bruns- wick, N.J. 07102. r feeding has ended. Preliminary observations indicate that all treatments! were applied early and effectively enough to prevent most of the damage that would have otherwise occurred in 1974. No adverse environmental damage has been observed, the Forest Service says. Unless new moth populations develop in different areas, no addi tional treatments will be necessary in 1975. Testing of degradable chemical substitutes for DDT, now complete, HYGIENISTS MEET The American Industrial Hygiene Association will present a special course on industrial hygiene measure ments in five locations during the next nine months. Jointly sponsored by the National Institute of Occupational Safety and Health, the course is intended tor in-, dustrial hygienists, chemists, engi-J neers and safety personnel who want! additional training in air sampling! techniques and measurements. has turned up at least one candidate. The course will be offered at: Sevin 4 Oil, the Forest Service says, Philadelphia Oct. 7-18. 1974 f has considerable promise. Final eval Chapel Hill, N.C. Nov. 11-22, 1974 uations of the tests will be completed Houston Jan. 13-24,1975, during the next several months. San Francisco Feb. 10-21,1975* Chicago Mar. 10-21,1975 Rutgers University's computer center Tuition is S600. Classes will be lim will pe used in a national research ited to 30 students. For more informa project on possible health effects of tion, contact William E. McCormick, Helicopters spray DDT on tussock moths in Malheur National Forest. Ore. pesticide residues in fruits and vege tables. managing director, AIHA, 66 SoutP Miller Road, Akron, Ohio 44313. BOR 007188