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• Studies on Damping-off Diseases Caused by Rhizoctonia solani Kühnof Some Crops in Hanoi, 2011-2012

  Do Tan Dung

  Date Received: 29-05-2013 / Date Accepted: 15-08-2013 / Date Published: 13-06-2025

   Abstract PDF (VIETNAMESE)

  Rhizoctonia solani Kühnis a soil-borne fungus that causes root rot disease on a wide range solanaceous, cucurbitaceous and fabaceous plants such as tomato, soybean, cucumber, yard long bean and groundnut. Field surveys conducted during 2011-2012 in Hanoi showed that the damping-off disease occurred on all host plants in the Hanoi region. However, the disease incidences varied from crop to crop, ranging from 2.8% on tomato, 4.55% on groundnut, 7.6% on cucumber to 7.46% on yard long bean. The morphological, biological studies and particularly pathogenicity tests of five R. solani isolates from five above-mentioned diseased plants showed that all isolates were identical in morphological, biological and pathogenic features. Bio-tests of the R.solani isolates on artificial medium showed that the antagonistic fungus (Trichoderma viride) is effective in controllingl R. solani. In the dual culture test (Petri disks test), the inhibition efficacies of T. viride to two isolates of R. solani isolated from tomato and cucumber were 79.1% and 79.8%, respectively. Potting test, in which plants were grown in sterilized soil in the greenhouse showed that the control efficacies of T. viride to these two R. solani isolates were 73.2% on tomato and 76.2% on cucumber..

  DOI: https://doi.org/10.31817/tckhnnvn.2013.11.4.

• Production and Application of Fungal Antagonists Trichoderma to Control Some Soil-borne Fungal Diseases of Potato, Ground-nut and Soybean

  Nguyen Van Vien, Nguyen Thi Tu, Bui Van Cong

  Date Received: 05-06-2025 / Date Published: 13-06-2025

   Abstract PDF (VIETNAMESE)

  The present experiment was conducted to determine the effectiveness of fungal antagonist formulations derived from Trichoderma viride (CP2, CP3 and CP4) in controlling some soil-borne fungal diseases of potato, ground-nut and soybean. The T. viride  was isolated from the soybean soils at Phu Thi – Gia Lam and some other locations.  For potatoes, tuber treatment  with 50 g CP2,  200g CP4 and mixed with 100 kg manures per 10 kg tubers  gave the highest control efficiency against southern blight disease (58.3%),  For soybean, spraying CP3 at a concentration of 15g in 3 litters  per 30 m2 at seedling stage gave good control efficacy after 21 days (75.5% for the damping-off  and 67.7% for the southern blight ). Peanut seed treatment with 5g CP3 or CP2 per kg seeds gave good control of damping-off disease (80,8% and 79.4%, respectively.  In field demonstration plots potato, soybean and peanut yield increased by 9.7% , 12.2 %. and 15.6 %, respectively in comparison with the control.

  DOI: https://doi.org/10.31817/tckhnnvn.2012.10.1.