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Most pesticides work better under PH4-6 conditions

Question: Are pesticides more effective under acidic or alkaline conditions?

Answer: Commonly used pesticide ph stability table is as follows :

Paraquat: It is stable under the condition of pH value 3 and decomposes quickly under the alkaline medium.

Glyphosate: Under acidic conditions, it is more stable than alkaline medium.

Trichlorfon: Degradation time:510d (pH4),46h (pH7), < 30min (pH9)

2,4-DAmine: More stable under acidic conditions.

Chlorothalonil: More stable under acidic conditions, unstable in neutral and alkaline conditions.

Benomyl: Degradation time:PH7, 1h; pH5-6, >30h.

Chlorpyriphos: With the pH increasing, the degradation speed increases.

Mevinphos: Degradation time:1.4h(pH11),120d(pH5).

Propargite: Degradation time:1h(pH9), 331h(pH6).

Methamidophos:More stable under acidic conditions.

Acephate: Degradation time:pH9 (16hrs), pH3 (710hrs), pH5 activity.

Beta-cyfluthrin: Degradation time:25d(pH4); 11d(pH7); 5d(pH9).

Cyfluthrin:All isoforms stabilized under pH4 conditions.

Flucythrinate:Under the basic conditions, it is quickly resolved.

Tau-fluvalinate:Degradation time:48d(pH5), 1.1d(pH9) .


Bifenthrin: Stable under acidic media.

Fenpropathrin:Dissolve under alkaline conditions.

Dimethoate:1.2d (pH9) Stable between pH 2-7.

Endosulfan:In the acidic condition, it is more stable than the alkali condition.

Chlorsulfuron: Stable under pH5.5-7 conditions.

Chlorimuron-ethyl :More stable under pH5 conditions.

Cypermethrin:Stability of drug efficacy between pH 3-5.

Fenvalerate:Under the basic conditions, the solution is very fast.

Deltamethrin:Under the conditions of acidity, it is more stable than under the conditions of alkalinity.

Ethephon: it's stable under<pH5.

Rimsulfuron:Degradation time:0.3d(pH9),4.6d(pH5).

Bacillus thuringiensis: pH4-7 stable; pH7 easy to decompose, pH>10 only 1h100% dissociation.

In summary, we can draw a conclusion that most pesticides are more stable under acidic conditions and have better results. The optimal pH condition range is 4-6.

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