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- Title
THE EFFECT OF FLUOMETURON ON THE BEHAVIOUR OF CITRUS LEAVES.
- Authors
Goren, R.
- Abstract
The application of fluometuron, a phenylurea herbicide, at rates of up to 80 kg/ha a.i., to Shamouti orange, Washington Navel orange and Marsh Seedless grapefruit trees; and in rates of up to 16 kg/ha a.i. to young Sour orange seedlings, did not affect photosynthesis, respiration (as measured using the Warburg apparatus), dry weight and chlorophyll content of the leaves. Leaf-disc experiments showed that when application is given more directly to the site of action, photosynthesis can be inhibited up to about 70% by 80 mg/l of fluometuron. The level of inhibition is related to the application technique (shaking or infiltration), age of leaves and size of discs. The ability to inhibit photosynthesis was decreased in the demethylated derivatives of fluometuron. Translocation studies with 14C-fluometuron indicated that most of the radioactivity is accumulated in the root system and in the lower part of the stem. The citrus tree can be considered to be resistant to fluometuron; either the lack of translocation, or demethylation, or both may be the cause.
- Subjects
HERBICIDES; ORANGES; GRAPES; PHOTOSYNTHESIS; RESPIRATION in plants; CHLOROPHYLL
- Publication
Weed Research, 1969, Vol 9, Issue 2, p121
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1969.tb01461.x