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General
Information
- Metalaxyl is a colorless,
odorless crystal and it is very soluble in water.
- Metalaxyl is moderately
stable under normal environmental conditions. I
- Metalaxyl is a phenylamide
fungicide with systemic function.
- Its chemical name is
methyl N-(methoxyacetyl)-N-(2,6-xylyl)-DL-alaninate.
- Metalaxyl is sold in a
combination with mancozeb, chlorothalonil, pentachloronitrobenzene,
captan, and triadimefon.
Uses
- Metalaxyl is a
systemic, benzenoid fungicide used in mixtures as a foliar spray for
tropical and subtropical crops, as a soil treatment for control of
soil-borne pathogens, and as a seed treatment to control downy
mildews.
- Metalaxyl may be used
on many different food crops, including tobacco, ornamentals,
conifer, and turf applications.
- It can be used to
control Pythium in a number of vegetable crops, and Phytophthora in
peas.
- Metalaxyl is
registered for use on over 100 agricultural crops (including more
than 30 seed treatment uses).
Metalaxyl is also registered for ornamental and turf uses.
- More than 90% of the
total poundage of metalaxyl used domestically is used in the
following ten crops/sites: tobacco, turf, potatoes, ornamentals,
soybean (seed treatment), onions, citrus, cucurbits, tomatoes, and
cotton.
Technology
- Metalaxyl
biodegradation was analyzed during 63 days by means of
radiometric techniques to verify biomineralization and
degradation product formation from the applied C-metalaxyl.
- A simple bioassay
was developed for quantifying the fungicide metalaxyl in small
samples of potato leaf tissue.
- It is important to
find a novel technique that is effective in the remediation of
metalaxyl in environment.
- Four
microorganisms, Pseudomonas sp., Aspergillus niger, Cladosporium
herbarum and Penicilluim sp., were isolated from cucumber leaves
previously treated with metalaxyl using enrichment technique.
These isolates were evaluated for detoxification of metalaxyl at
the recommended dose level in aquatic system.
Report
- This is the
first report of metalaxyl resistance following its use as a
pea seed dressing for downy mildew control in Australia.
- The proposed
MRLs for metalaxyl in Canada are the same as corresponding
tolerances established in the United States for root and
tuber vegetables and leaves of root and tuber vegetables.
- Metalaxyl is
an agricultural fungicide. It is registered for use in New
Zealand, and is available in a variety of formulations, many
of which include other active ingredients such as mancozeb,
thiabendazole, cymoxanil and fludioxonil.
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