Physical incompatibility of mixing of insecticides and fungicides

Abstract

The objective of this study was to evaluate the physical interaction between simulated tank mixtures
of different classes of pesticides. The treatments consisted of mixtures of six insecticides (methomyl,
chlorpyrifos, teflubenzuron, triflumuron, cypermethrin and cyhalothrin + thiamethoxam) with six
fungicides (pyraclostrobin/epoxiconazole, trifloxystrobin/tebuconazole, carbendazin, flutriafol,
azoxystrobin/cyproconazole, flutriafol/tiofanato- methyl) in the absence and presence of two pH
reducers (Pyroligneous acid and boric acid) with four replications. We used a scale from 1 to 5
to evaluate the degree of mismatch, where 1 is the immediate separation of the mixture and it is
recommended not to apply is 5 and the homogeneity of the mixtures without restrictions apply.
The major physical incompatibilities in mixtures of insecticides and fungicides were observed in
the presence of the insecticides chlorpyrifos, cypermethrin, thiamethoxam/lambda-cyhalothrin
and the insecticides physiological teflubenzuron, triflumuron and the fungicide pyraclostrobin/
epoxiconazole, azoxystrobin/cyproconazole and flutriafol/thiophanate-methyl. Pyroligneous acid
and boric acid showed to be good alternatives such as reducing the pH in the preparation of spray
mixtures spraying of insecticides with fungicides. Should be avoided tank mixtures of chlorpyrifos,
and teflubenzuron triflumuron with all fungicides tested.