Trichoderma harzianum

About: Trichoderma harzianum is a research topic. Over the lifetime, 4731 publications have been published within this topic receiving 96796 citations.

Fatal case of Trichoderma harzianum infection in a renal transplant recipient.

Abstract: We describe the second known case of human infection by Trichoderma harzianum. A disseminated fungal infection was detected in the postmortem examination of a renal transplant recipient and confirmed in culture. The only other reported infection by this fungus caused peritonitis in a diabetic patient. The in vitro antifungal susceptibilities of the clinical strain and three other strains of Trichoderma species to six antifungal drugs are provided. This case illustrates the widening spectrum of opportunistic Trichoderma spp. in immunocompromised patients and emphasizes the problems in diagnosing invasive fungal diseases.

Effect of culture conditions on spore shelf life of the biocontrol agent Trichoderma harzianum

Abstract: The influence of pH, carbon:nitrogen (C:N) ratio, carbon content and harvesting time on spore attributes of the biocontrol agent Trichoderma harzianum was evaluated. The effect of these culture parameters on viability, shelf-life and ultrastucture was also assessed. pH was a key parameter to manipulate for both growth and sporulation, while carbon concentration and C:N ratio strongly affected spore production time. At fixed pH, the C:N ratio had a limited influence on production yield, but was critical for spore shelf-life. The highest spore longevity was found in a medium with a C:N ratio of 14 and a pH of 7.0, when most resulting spores were still alive after 45 d storage. These spores also remained viable during storage under a broad range of relative humidities, indicating that they would be more sustainable in the field.

Trichoderma spp. from rhizosphere soil and their antagonism against Fusarium sambucinum

Abstract: One hundred and forty six (146) isolates of Trichoderma spp. were obtained from rhizosphere soils of potato plants in the middle areas of Gansu Province, China. By means of dual culture method, they were examined for antagonism against Fusarium sambucinum , which causes potato dry rot. Ten of the isolates were found to be evidently antagonistic to the pathogen. Based on morphological characteristics and molecular analyses, the antagonistic isolates were identified as Trichoderma harzianum Rifai , Trichoderma longibrachiatum Rifai, Trichoderma atroviride Karsten and Trichoderma virens. Among these isolates, D-3-1 (T. longibrachiatum ) showed the strongest inhibition of the growth of Fusarium sambucinum . Key words: Trichoderma , potato, dry rot, biological control, Fusarium sambucinum.

Seed-borne Fungal Diseases of Onion, and their control

Abstract: Aspergillus niger, Botrytis aclada and Fusarium oxysporum f. sp. cepae are relevant seed-borne fungi of onion (Allium cepa L.) and are known as causal agents of black mould, neck rot and basal rot diseases, respectively. These pathogens can be transmitted from infected seeds to seedlings, sets or bulbs. They eventually kill the entire plant through degradation of the tissues. Different principles are suggested for their control. Botrytis squamosa, Cladosporium allii-cepae and Stemphylium vesicarium, which cause several lesion on the onion leaves, can also occur on seeds but they are not able to demonstrate disease transmission to the plant parts. The role of other seed-borne fungi (namely, Alternaria alternata, Aspergillus alutaceaus, A. flavus, Beauveria bassiana, Cladosporium cladosporioides, Colletotrichum dematium, Curvularia lunata, Drechslera australiensis, Humicola fuscoatra, Stemphylium botryosum, Trichoderma harzianum, T. pseudokoningii and Trichothecium roseum) on development of onion diseases is not known.