Effect of new broad spectrum fungicide amistar on soil microorganisms in field conditions

Abstract EN

A field experiment was conducted at the Demonstration Farm of Moscow Agricultural Academy in 1999 to investigate the effect of the fungicide Amistar (active ingredient-azoxystrobin) on soil microorganisms where potato plants were double sprayed by azoxystrobin (0.72L / ha).

The fungicide inhibited soil fungi by up to 30 % within the period of 35 days however, it did not render conspicuous effect on soil microorganisms that use organic or mineral forms of nitrogen, but stimulated the growth of actinomycetes and soil microorganisms capable of growing on poor media.

The residual quantities of azoxystrobin in potato were not marked.

Under these conditions small quantity of azoxystrobin was found in soil (0.26 mg / kg) that degraded by 98.2 % in 47 days.