34
Table 2.1 List of s-triazine pesticides
s-Triazine
herbicides
X
R 1
R 2
Soil
halflife
(days) Applications
WHO
classification
Atrazine
-Cl
-NHC 2 H 5
-NHC 3 H 7
(iso)
14–
150
Corn, sorghum,
sugarcane,
pineapple,
conifers,
forestry
Slightly
hazardous
Atratone
-OCH 3 -NHC 2 H 5
-NHC 3 H 7
(iso)
30
Nonagricultural
areas,
sugarcane, corn
Obsolete
substance
Ametryn
-SCH 3 -NHC 2 H 5
-NHC 3 H 7
(iso)
37–
250
Sugarcane,
corn, pineapple
Moderately
hazardous
Cyanazine
-Cl
-NHC(CN)
(CH 3 ) 2
-NHC 2 H 5
12–25 Vegetables,
onions,
potatoes,
sweetcorn
Moderately
hazardous
Desmetryn
-SCH 3 -NH 2 CH 3
-NHC 3 H 7
(iso)
9–50 Brassicas,
onions and
leeks, fodder
rape
Slightly
hazardous
Dimethametryn -SCH 3 -NHC 2 H 5
-NHCH(CH 3 )
C 3 H 7 (iso)
37–
250
Sugarcane,
corn, pineapple
Slightly
hazardous
Prometryn
-SCH 3 -NHC 3 H 7
(iso)
-NHC 3 H 7
(iso)
41–60 Cotton, celery,
dill, potatoes,
sunflowers,
carrots, peanuts
Slightly
hazardous
Prometone
-OCH 3 -NHC 3 H 7
(iso)
-NHC 3 H 7
(iso)
500
Non-cropland
Slightly
hazardous
Propazine
-Cl
-NHC 3 H 7
(iso)
-NHC 3 H 7
(iso)
45–
131
Corn, sorghum,
carrots, fennel,
ornamentals,
greenhouse use
Unlikely to
present an
acute hazard
Simazine
-Cl
-NHC 2 H 5
-NHC 2 H 5
60–
102
Corn, fruit and
nut crops
Unlikely to
present an
acute hazard
Simetryn
-SCH 3 -NHC 2 H 5
-NHC 2 H 5
60
Rice, corn,
bean, pea,
cereals, cotton
Slightly
hazardous
Terbutryn
-SCH 3 -NHC 2 H 5
-NHC(CH 3 ) 3 14–74 Sugarcane,
cereal,
sorghum,
sunflowers,
peas, potatoes
Slightly
hazardous
(continued)
K. Rajendran et al.