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Trichoderma harzianum
About: Trichoderma harzianum is a research topic. Over the lifetime, 4731 publications have been published within this topic receiving 96796 citations.
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TL;DR: Trichoderma harzianum reduced the severity of symptoms, expressed as ‘rhizoctonia stem lesion index’ (RSI), during the first 7 days post-inoculation when the inoculum of R. solani was placed at certain distances (30‐60 mm) from the host.
Abstract: Stem canker and black scurf are diseases of potato caused by the fungus Rhizoctonia solani . Spatiotemporal experimentation and empirical modelling were applied for the first time to investigate the effect of antagonistic Trichoderma harzianum on the dynamics of soilborne R. solani on individual potato plants. Trichoderma harzianum reduced the severity of symptoms, expressed as ‘rhizoctonia stem lesion index’ (RSI), during the first 7 days post-inoculation when the inoculum of R. solani was placed at certain distances (30‐60 mm) from the host. For example, with inoculum at 40 mm from the host, RSI was 6 and 40 with and without T. harzianum , respectively. At later observation times, the antagonistic effect was overcome. Trichoderma harzianum reduced the severity of black scurf on progeny tubers. Furthermore, the mean number of progeny tubers per potato plant was reduced by the biocontrol treatment (means of 6·5 ± 1·1 and 9·9 ± 2·7 tubers per plant with and without T. harzianum , respectively), as was the proportion of small (0·1‐20·0 g) tubers (48% and 66% with and without T. harzianum , respectively). Additionally, there were fewer malformed and green-coloured tubers in pots treated with T. harzianum than in those without T. harzianum .
50 citations
TL;DR: A chitinolytic enzyme was purified from the culture filtrate of T. harzianum by precipitation with ammonium sulphate followed by affinity binding to swollen chitin and release with 10% (v/v) acetic acid, demonstrating that the enzyme was an exochitinase releasing N-acetylglucosamine only.
50 citations
TL;DR: Biological control agents did not change significantly throughout the season, which may be the reason for their effectiveness, and reduced the disease severity index (DSI) and the number of sclerotia of Sclerotiorum in the soil by 95%.
50 citations
TL;DR: Disease control declined as Trial 2 progressed with over 95% of the plants infected in all treatments at trial completion, but strategies for field application of the best biological control agents for control of onion white rot are discussed.
Abstract: The fungal species Chaetomium globosum, Coniothyrium minitans, Trichoderma harzianum, T. koningii, and T. virens were confirmed as antagonists of Sclerotium cepivorum, the causal agent of onion white rot in two glasshouse trials. In Trial 1, all fungal treatments afforded disease control equivalent to the fungicide procymidone (1 g a.i./ 100 g seed) when applied to the soil as a soil additive (sand:bran:fungal mix, 1:1:2) at the time of planting. Applications of T. harzianum (C52) and T. koningii (C62) significantly reduced disease incidence from 39.8% in the control to 7.7 and 5.4%, respectively. When treatments were applied 2 weeks before planting, only T. harzianum (C52) gave disease control equivalent to the fungicide. In Trial 2, disease incidence was significantly less when T. harzianum (C52, D73) and T. virens (GV4) were applied as soil additives at planting (34, 40, and 43.1 %, respectively) compared with that in the control treatment (66.5%) 8 weeks after planting. However, disease contr...
50 citations
TL;DR: Trichosetin, a tetramic acid-containing metabolite produced in the dual culture of Trichoderma harzianum and Catharanthus roseus (L.) G. Don callus, was subjected to phytotoxicity assays.
49 citations