Survival of Pochonia chlamydosporia on the soil surface after different exposure intervals at ambient conditions.

Autor: Fernandes RH; Universidade Federal de Viçosa - Campus Rio Paranaíba (UFV-CRP), Instituto de Ciências Agrárias, Caixa Postal 22, Rio Paranaíba, Minas Gerais 38810-000, Brazil., Lopes EA; Universidade Federal de Viçosa - Campus Rio Paranaíba (UFV-CRP), Instituto de Ciências Agrárias, Caixa Postal 22, Rio Paranaíba, Minas Gerais 38810-000, Brazil. Electronic address: everaldolopes@ufv.br., Borges DF; Universidade Federal de Viçosa - Campus Rio Paranaíba (UFV-CRP), Instituto de Ciências Agrárias, Caixa Postal 22, Rio Paranaíba, Minas Gerais 38810-000, Brazil., Bontempo AF; Universidade Federal de Viçosa - Campus Rio Paranaíba (UFV-CRP), Instituto de Ciências Agrárias, Caixa Postal 22, Rio Paranaíba, Minas Gerais 38810-000, Brazil., Zanuncio JC; Universidade Federal de Viçosa - Campus Viçosa, Departamento de Entomologia, Viçosa, Minas Gerais 36570-900, Brazil., Serrão JE; Universidade Federal de Viçosa - Campus Viçosa, Departamento de Entomologia, Viçosa, Minas Gerais 36570-900, Brazil.
Jazyk: angličtina
Zdroj: Revista iberoamericana de micologia [Rev Iberoam Micol] 2017 Oct - Dec; Vol. 34 (4), pp. 241-245. Date of Electronic Publication: 2017 Sep 27.
DOI: 10.1016/j.riam.2017.04.001
Abstrakt: Background: Exposure of the nematophagous fungus Pochonia chlamydosporia to solar radiation and elevated temperatures before being incorporated into the soil can reduce its survival and efficiency as biocontrol agent.
Aims: A field experiment was carried out to assess the effect of the exposure period on the viability of P. chlamydosporia applied on the soil surface.
Methods: A commercial bionematicide based on P. chlamydosporia was sprayed on soil, and soil samples were collected before and at 0, 30, 60, 90, 120, and 150min after fungal application. Relative humidity (RH), the irradiance (IR), air temperature (AT), and soil temperature (ST) were recorded. The number of P. chlamydosporia colony forming units (CFUs) was evaluated after 20 days of incubation.
Results: P. chlamydosporia survival decreased over the time of exposure on the soil surface. Overall, the number of CFUs decreased by more than 90% at 150min after application. Exposure to RH ≥61%, ST and AT between 25-35°C and 19-29°C, and IR between 1172 and 2126μmol of photons m -2 s -1 induced a negative exponential effect on the survival of the fungus over the time.
Conclusions: Exposure to climatic conditions on the soil surface reduces P. chlamydosporia viability.
(Copyright © 2017 Asociación Española de Micología. Publicado por Elsevier España, S.L.U. All rights reserved.)
Databáze: MEDLINE
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