부산대학교 도서관

The use of biopesticides formulated from entomopathogenic fungi is a strategy utilised in integrated pest management programmes. The microorganisms used in these biopesticides are isolated from terrestrial organisms and ecosystems. However, bioprospecting in marine environments may lead to the discovery of promising fungi for pest control. In this study, marine fungi were identified and evaluated for the control ofBrevicoryne brassicae. The effects of the most virulent isolate so identified on the mortality of aphids were compared to the effects of bioinsecticides that were formulated from fungal strains ofBeauveria bassiana(Bovemax®) andMetarhizium anisopliae(Methamax®). Moreover, lethal and sublethal effects of this isolate onB. brassicaebiological parameters were also examined. The isolates were identified asAspergillus versicolor,Aspergillus sydowii(isolates 1 and 2),Penicillium dipodomyicola, andTrichoderma harzianum. The fungal strainA. versicolorwas the most virulent fungal species, causing 85.9% mortality inB. brassicaeat 24 h. The mortality rate caused byA. versicolorwas similar to that caused by Bovemax® and Methamax® at concentrations of 105conidia mL−1, and superior to that caused by Methamax® at a concentration of 109conidia mL−1. The exposure ofB. brassicaeto CL25(0.32 × 103) ofA. versicolordid not affect the net reproductive rate (Ro), average generation time (T), intrinsic rate of population growth (rm), and finite rate of population increase (λ). This is the first study to demonstrate thatA. versicolorisolated from a marine environment is a promising candidate for the biological control of agricultural pests. [ABSTRACT FROM PUBLISHER]