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Influence of Irrigation Methods and an Adjuvant on the Persistence of Carbaryl on Pakchoi
Author(s) -
Marutani Mari,
Edirveerasingam Veronica
Publication year - 2006
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2005.0484
Subject(s) - carbaryl , irrigation , pesticide , adjuvant , persistence (discontinuity) , brassica , chemistry , toxicology , biology , horticulture , zoology , agronomy , immunology , geotechnical engineering , engineering
Influence of irrigation methods and use of an adjuvant on the persistence of the carbaryl (1‐naphthyl N ‐methylcarbamate) on pakchoi [ Brassica rapa L. subsp. chinensis (Rupr.) Olsson] was studied using a commercial enzyme linked immunosorbent assay kit. After applying carbaryl at a.i. 10.6 g L −1 with or without an adjuvant (Latron B‐1956) to leaves, plants were provided water daily by either overhead or basal application. Pesticide residue on leaf tissues was examined immediately after pesticide application and on 2, 4, 6, and 8 d after pesticide application. Use of the adjuvant did not affect the initial deposit of the pesticide, however pesticide persistence was improved with the adjuvant regardless of irrigation. Overhead irrigation contributed to rapid loss of the pesticide by washing carbaryl from the leaf surface. The longest half‐life of carbaryl (6.5 d) was detected on plants receiving basal irrigation plus the adjuvant while the shortest half‐life (2 d) was observed when plants were treated with overhead irrigation and no adjuvant.