A handbbok on Weed Control in Rice.pdf

Surfactants are often added to
herbicide formulations by the manu-
facturer, but additional surfactants
may be needed for some postemer-
gence herbicides or in some environ-
mental conditions (e.g., bentazon
under low temperatures). The herbi-
cide label indicates how much
surfactant to use when an additional
surfactant is required. When surfac-
tants are not recommended, their use
with foliage-applied herbicides can
result in loss of selectivity.
Herbicide labels
The best source of information con-
cerning safe and effective herbicide use
is the product label (Fig. 4.1) printed
on or attached to the herbicide con-
tainer. It gives directions on effective,
safe use of the herbicide. The label
should be read carefully and under-
stood before any herbicide is used. The
herbicide label is a legal document that
in many countries has government
approval. Every herbicide product
label should contain the following
information:
Trade or brand name. The trade or
brand name identifies a herbicide of
one company and differentiates it from
those of other companies. Like com-
mon weed names, trade names of
herbicides may change from country to
country. Thus, the trade name is not
always adequate for identifying a
herbicide or determining correct rates
of application. When an application
rate is recommended with a trade
name, the rate normally refers to the
amount of formulated product, and
not the rate of active ingredient or the
acid equivalent.
Chemical and common names. Herbi-
cides have complex chemical names.
Rules for selecting suitable chemical
names are given by appropriate
chemical associations (e.g., the Interna-
54 Weed control handbook
tional Union of Pure and Applied
Chemistry [IUPAC]). The chemical
name refers to the active ingredient. In
addition to the chemical name, each
herbicide is given a common name
which also applies to the active ingre-
dient. The common name is not the
same as the trade name of the same
herbicide. Common names for herbi-
cides are approved by appropriate pro-
fessional bodies, such as the Interna-
tional Standardization Organization
4.1 All herbicide labels are required to
provide important information. Users should
read and understand the label before opening
any herbicide container.