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RECORD NUMBER: 5 OF 11

Main Title Development of a Selective Algaecide to Control Nuisance Algal Growth.
Author Prow, Bernard L. ; McIlhenn, William F. ;
CORP Author Dow Chemical Co., Freeport, Tex. Texas Div.
Year Published 1973
Report Number EPA-68-01-0076; EPA-16010-EDJ; 00702,; 660/3-73-006
Stock Number PB-225 027
Additional Subjects ( Algicides ; Tests) ; ( Pesticides ; Algae) ; Economic analysis ; Safety ; Production ; Aquatic weeds ; Water quality ; Water supply ; Protozoa ; Anabaena cylindrica ; Microcystis aeruginosa ; Ochromonas ovalis ; Biological weed control
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NTIS  PB-225 027 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 137p
Abstract A compound which would effectively and economically control the growth of nuisance species of blue-green algae with a minimum impact on desirable forms of life in the aquatic environment was searched for. A computerized structure search of more than 100,000 compounds was made to select the analogs of the following four Phase I prime candidates: 2,5-Dichloro-3,4-dinithrothiophene; (5-Chloro-2-(p-nitrophenoxy)phenyl)phenyliodoniumchloride; 4-Amino-2,5-dibromophenylthiocyanate; and 1,1-Dimethyltetradecylamine, hydro-chloride. Through this endeavor 1309 compounds were selected, 41 of which emerged from a rapid, agar-plate screening as candidates for final laboratory screening tests. A golden-brown flagellate, Ochromonas ovalis, which exhibited phagocytic activity against the blue-green alga, Microcystis aeruginosa, was discovered during Phase I. Further research and development of biological-chemical control system included studies involving several species of Ochromonas and conditions which would enhance their phagocytic activity against Microcystis aeruginosa, with Ochromonas ovalis proving to be the most voracious feeder.
Supplementary Notes Supersedes report No. PB-218 273.
Availability Notes Paper copy available from GPO $1.50 as stock no. EP1.23:660-73-006.
NTIS Title Notes Ecological Research series.
PUB Date Free Form Aug 73,
Category Codes 6F; 57P; 57H
NTIS Prices PC-GPO/MF A01-NTIS
Document Type NT
Cataloging Source NTIS/MT
Control Number 326568673
Origin NTIS
Type CAT