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Ecotoxicological information

Toxicity to terrestrial plants

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Administrative data

Endpoint:
toxicity to terrestrial plants
Type of information:
experimental study
Adequacy of study:
other information
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Study meets generally accepted scientific principles

Data source

Reference
Reference Type:
publication
Title:
N,N'-dibutylurea from n-butyl isocyanate, a degradation product of benomyl. 1. Formation in benlate formulations and on plants. J
Author:
Moye HA, Shilling DG, Aldrich HC, Gander JE, Buszko M, Toth JP, Brey WS, Bechtel B, Tolson JK (1994).
Year:
1994
Bibliographic source:
Agric. Food Chem. 42, 1204-1208.

Materials and methods

Principles of method if other than guideline:
Method: other: Phytotoxicity test method developed by the authors (Moye et al., 1994)
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
IUCLID4 Test substance: other TS: n-Butyl isocyanate, purity > 99 %

Test organisms

Species:
other: other terrestrial plant: fern (Nephrolepis exaltata) and cucumber (Cucumis sativus L.)

Results and discussion

Any other information on results incl. tables

RS-Freetext:
After 24 h both sets of plants showed phytotoxic symptoms.
Dibutylurea was detected in extracts of all treated plants.
Whether the plant phytotoxicity was due to n-butyl
isocyanate or its hydrolysis products dibutylurea or
butylamine was not analyzed. 
The following observations were made:
FERN: 
- After 24 h the ferns showed brown spots on the leaves 
- After 72 h they were totally brown and died off 
CUCUMBER: 
- After 24 h spotted browning of the cotyledons followed by
a browning of the guttation water 
- By 72 h browning to the mature leaves had increased but
had not covered the entire leaves 
- After 72 h the mature leaves exhibited intravenal
yellowing and a yellowing around the edges

Applicant's summary and conclusion

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