Thermal storage effect on some of non fumigant nematicides

الملخص EN

The effect of thermal storage on the degradation of fenamiphos ,oxamyl and ethoprophos under trade names nematop 40% EC, hidet star 24% SL and nemavet 20% EC, respectively, were studied .The results showed that the difference of the degradation rate for fenamiphos ,oxamyl and ethoprophos active ingredients in its formulation during storage stability test ,where the calculated half-life T 0.5 were 615.6, 744.6 and 350.5 dayes, respectively.

It meanes that velocity decomposition can be arranged as ethoprophos > fenamiphos> oxamyl .

Also, N.

nitroseamine (impurity) in oxamyl was not detected during 30 days at 54±2°C.

On the other, gas chromatography/mass spectrometry (GC-MS) was used to compare the fragmentation of three nematicides formulation (fenamiphos ,oxamyl and ethoprophos ) and resultes showed that breakdown of phenol-3- methyl-4-methylthio (fenamiphos phenol) and methyl (2- dimethyl amino)-N-hydroxy-2-oxoethanimidothioate (oximino oxamyl)as main equivalent product for fenamiphos and oxamyl, respectively.

While ethoprophos less stability than fenamiphos and oxamyl.