A fost apreciată, în condiţii de câmp, influenţa extractului din specia Veratrum lobelianum Bernh. asupra speciilor benefice: Chrysopa carnea Steph. (Neuroptera, Chrysopidae), Coccinella septempunctata Linnaeus. (Coleoptera, Coccinellidae), Zicrona caerulea L. (Hemiptera: Pentatomidae). A fost demonstrat, că densitatea populaţiei speciilor benefice pe parcelele tratate cu extractul vegetal e considerabil mai înaltă(1,2–3,0 ori) decât pe parcela etalon şi se afla la acelaşi nivel cu martorul.

On carrying out the field tests there was estimated the influence of special extracts of Veratrum lobelianum Bernh on useful entomophagous potatoes, in particular on Chrysopa carnea Steph. (Neuroptera, Chrysopidae), Coccinella septempunctata Linnaeus. (Coleoptera, Coccinellidae) and Zicrona caerulea L. (Hemiptera: Pentatomidae). As a result there was revealed that on the bushes of the potatoes, treated by tested extracts, the number of entomophagous insects remains at the same level, as in the control and it is considerable (in 1,2-3 times) exceeds the number of entomophagous in the chemical standard.