Impact of UV-B radiation on Clonostachys rosea germination and growth

Abstract

Sensitivity to UV-B radiation is one of the main limitations of biological control of plant pathogens in the field. The effect of UV-B radiation on germination and leaf tissue colonization by the biological control agent Clonostachys rosea was evaluated. There were variations among C. rosea strains in sensitivity to UV-B radiation. The most tolerant strain (LQC62) had relative germination of about 60 % after irradiation of 4.2 kJ m(-2). The deleterious effects of UV-B radiation on C. rosea colonization were overcome by higher conidial concentration. In addition, the tolerance of C. rosea conidia was higher when irradiated over leaf disks compared to agar media, and this is very important information to determine the dose and spray strategies for applying C. rosea in the field.

Effect of Ultraviolet Radiation on Fungi <i>Beauveria bassiana</i> and <i>Metarhizium anisopliae</i>, Pure and Encapsulated, and Bio-Insecticide Action on <i>Diatraea saccharalis</i>

“…For filamentous fungi, most studies present reduction in germination and/or growth when these have been exposed to UV radiation, which is more significant and evident when the exposure time was increased [24] [25]. This same trend was observed in this study for unformulated conidia.…”

Predatory activity of Butlerius nematodes and nematophagous fungi against Haemonchus contortus infective larvae

“…Some species of the genus Trichoderma (Hypocreales, Hypocreaceae), which are considered important nematode bio-regulator, can be used on agricultural soils without causing environmental problems (MARTÍNEZ et al, 2013). Other genera/species of fungi such as Clonostachys rosea (Hypocreales, Bionectriaceae) are considered mycoparasites that produce invasive hyphae, nematicidal toxins and induce resistance in their hosts (SCHROERS, 2001;COSTA et al, 2012).…”

Effects of UV-B radiation on Lecanicillium spp., biological control agents of the coffee leaf rust pathogen

“…UV-B and UV-A radiations can cause cellular membrane disorganization, protein denaturation, oxidative stress, and damage to DNA, RNA, and ribosomes (Griffiths et al, 1998), and possibly cause damage to several organisms, such as plant pathogens, insects pests, plants and beneficial organisms, impacting the agroecosystems (Caldwell et al, 2003). UV-A and UV-B radiation can inactivate the structures of biological control agents due to genetic and morphological changes, resulting in lower efficacy of the biocontrol agent (Braga et al, 2001c), and is considered one of the main limitations for applying these organisms in the field (Braga et al, 2001b;Costa et al, 2012;Costa et al, 2013).…”