Pesticide Half-Life Chart |
| Adjusting
the pH of the spray solution can reduce pesticide decomposition and make the spray more
effective. The Following chart shows the Pesticide Half-Life or the time it takes for half
the amount of chemical to be decomposed (made inactive) at various pH levels. |
Pesticide
Product
|
Buffering*
|
Optimum
pH
|
Half-Life at pH indicated (50% decomposition)
|
9.0
Alkaline |
8.0
Alkaline |
7.0
Alkaline |
6.0
Acidic |
5.0
Acidic |
4.5
Acidic |
2,4-D
Amine |
|
6.0 |
|
|
Stable
at pH 4.5-7.0 |
Acclaim® |
|
6.5 |
|
|
Stable
under acidic conditions |
Actellic® |
|
7.0 |
|
12
days |
35
days |
|
7
days |
|
Aliette® |
|
6.0 |
|
Stable
at pH 4.0-8.0 |
Ammo® |
x |
4.0 |
35
hrs. |
|
More
stable in acidic conditions |
Asana® |
x |
4.0 |
|
|
More
stable in acidic conditions |
Atrazine |
|
7.0 |
|
|
|
|
|
|
Avenge® |
x |
5.0 |
Decomposes
in strong alkaline |
|
|
|
Balan® |
|
7.0 |
Not
effected by pH |
Banner® |
x |
7.0 |
Stable
over wide range of pH |
Banol®
|
|
6.0 |
Subject
to alkaline hydrolysis |
|
|
Banvel® |
x |
5.5 |
|
|
|
Stable
at pH 5-6 |
|
Bayleton® |
|
7.0 |
Stable
over wide range of pH |
Benlate® |
x |
5.0 |
|
|
1
hr. |
7
hrs. |
80
hrs. |
|
Betamix® |
x |
5.0 |
10
min. |
|
17
hrs. |
|
60
days |
|
Bravo® |
|
7.0 |
Stable
over wide range of pH |
Broadrange™ |
|
6.5 |
|
|
|
|
Avoid
pH below 4.0 |
Buctril® |
x |
5.0 |
Hydrolysis
above pH 7.0 |
|
|
|
Captan® |
x |
5.0 |
|
10
min. |
8
hrs. |
|
32
hrs. |
|
Carzol® |
x |
5.0 |
3
hrs. |
|
14
hrs. |
|
4
days |
|
Chipco®
26019 |
|
7.0 |
Rapid
hydrolysis at pH>8 |
|
7
days |
|
Classic® |
|
5.0 |
|
12
days |
35
days |
|
7
days |
Stable
in pH 5 |
Daconil®
2787 |
|
7.0 |
Stable
over wide range of pH |
Dacthal® |
|
7.0 |
Hydrolized
in strong acid and alkaline |
Des-i-cate® |
x |
5.0 |
|
|
|
|
Stable
at pH 4-5 |
Di-syston® |
x |
5.0 |
7.2
hrs. |
|
|
32
hrs. |
60
hrs. |
|
Diazinon |
|
7.0 |
29
days |
3
weeks |
10
weeks |
|
14
days |
8
days |
Dibrom® |
x |
5.0 |
Hydrolized
in 48 hrs. in pH>7 |
|
|
|
Dimethoate
|
x |
5.0 |
48
min. |
|
|
12
hrs. |
|
20
hrs. |
Dipel®
(Bt) |
|
6.0 |
Unstable
in pH>8 |
|
|
|
|
Diquat®
|
|
6.0 |
|
|
Stable
in neutral or acid solutions |
Dursban
|
|
6.0 |
|
1.5
days |
35
days |
12
hrs. |
|
63
days |
Dylox®
|
x |
5.0 |
|
63
min. |
6.5
hrs. |
3.7
days |
|
|
Dyrene®
|
|
6.5 |
22
hrs. |
|
33
days |
|
|
|
Embark®
|
|
6.5 |
Hydrolized
under alkaline conditions |
|
|
Ethrel®
|
|
5.0 |
Neutralized
in slightly alkaline water |
|
|
Funginex®
|
|
7.0 |
Stable
to pH 10 or 11 |
Furadan®
|
|
5.0 |
78
hrs. |
|
|
8
days |
|
|
Fusilade®
|
|
7.0 |
17
days |
|
21
weeks |
|
|
65
weeks |
Gallery®
|
|
7.0 |
Stable
over wide range of pH |
Glean®
|
|
7.0 |
Do
NOT lower pH of water |
|
|
|
Goal®
|
|
7.0 |
|
|
Stable
in neutral pH |
|
|
Gramoxone
Extra® |
|
6.5 |
Not
stable pH>7 |
|
|
|
|
