Fungal and biochemical impacts of the best fungal isolate against the adult cabbage aphid insect Brevicoryne brassicae (Hemiptera:Aphididae) and the white garden snail Theba pisana (Gastropoda: Helicidae)

Abstract

Several fungal species were isolated from various samples of soil and cabbage aphids in this investigation using Czapek-dox agar conditions, tested its toxicity, and compared Trichoderma asperellum with accession number (OQ616502) against cabbage aphids and white garden snail, which gave the high biocontrol effect against cabbage aphid, Brevicoryne brassicae (L.) (Hemiptera: Aphididae), while giving the lowly effect against the white garden snail, Theba pisana (Müller) (Gastropoda : Helicidae) at 10⁸ spore suspension after 5 days as 89.42% and 28 days as 26.67%, respectively. On the other hand, for an enzyme (three and seven days of treatment), biochemical studies revealed a very high decrease in the concentrations of amylase and invertase enzymes at the highest concentration of 10⁸ spore/ml, which caused the highest reduction compared to the control recording (-39.94, - 40.32, - 41.16%) and (-26.48, - 27.34, -28.32%) of the amylase enzyme (-16.53, -17.37, -34.19%) and (-24.42, -29.31, - 45.76%) of the invertase enzyme of T. pisana and B. brassicae, respectively.