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D M Benson - One of the best experts on this subject based on the ideXlab platform.
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biocontrol of Damping off of catharanthus roseus caused by pythium ultimum with trichoderma virens and binucleate rhizoctonia fungi
Plant Disease, 2000Co-Authors: J R Burns, D M BensonAbstract:ABSTRACT Four isolates of Trichoderma (Gliocladium) virens (G-45, G-65, G-85, and G-93) and two isolates of binucleate Rhizoctonia spp. (BNR621 and P9023) were evaluated for biocontrol of preemergence Damping-off of Catharanthus roseus (vinca) caused by Pythium ultimum. Putative biocontrol agents were amended to a soilless mix 1, 3, or 6 days prior to seeding and pathogen infestation to determine if colonization of the mix before infestation was important for biocontrol efficacy. Biocontrol of preemergence Damping-off of vinca with the four isolates of T. virens was variable. Only isolate G-93 gave control of preemergence Damping-off (10 to 18% disease) regardless of the length of time the mix was amended prior to seeding and infestation compared to the infested control (43% disease). In contrast, preemergence Damping-off was 10 to 15% with SoilGard (based on isolate GL-21 of T. virens). For isolate G-65, preemergence Damping-off of vinca was 0% in lots of mix amended 1 day prior to seeding, but over 60% ...
M.h. Ryder - One of the best experts on this subject based on the ideXlab platform.
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Suppression of Damping-off caused by Rhizoctonia solani, and growth promotion, in bedding plants by binucleate Rhizoctonia spp
Soil Biology & Biochemistry, 1994Co-Authors: A.r. Harris, D.a. Schisler, S.m. Neate, M.h. RyderAbstract:Abstract Nine isolates of binucleate Rhizoctonia spp, from potting media and nursery plants, were screened for their ability to control Damping-off disease caused by Rhizoctonia solani Kuhn AG 4 and AG 8. Seedlings of Capsicum annuum L. were grown in a pasteurized potting medium in growth chambers. All isolates prevented Damping-off caused by R. solani AG 4, and most isolates increased shoot weights in the presence of either AG 4 or AG 8. Two isolates were tested further on seedlings grown in pasteurized potting medium in a glasshouse. In two experiments, both isolates controlled Damping-off in Capsicum caused by AG 4. In another experiment, both isolates reduced Damping-off caused by AG 4 in Capsicum, Celosia and Viola seedlings, and increased shoot weights of Capsicum and Celosia. One isolate also reduced Damping-off in Petunia. Each isolate promoted shoot growth of seedlings in two of four experiments when no pathogen was added. As these binucleate Rhizoctonia isolates also control Pythium, they have potential for use as biological control agents in plant nurseries.
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Bacteria suppress Damping-off caused by Pythium ultimumvar. Sporangiiferum, and promote growth, in bedding plants
Soil Biology and Biochemistry, 1994Co-Authors: A.r. Harris, D.a. Schisler, M.h. Ryder, P.g. AdkinsAbstract:Abstract Fifteen isolates of bacteria, from potting media collected from South Australian plant nurseries and potting mix suppliers, were screened for ability to control Damping-off disease caused by Pythium ultimum var. sporangiiferum. The screening was by two bioassays on seedlings of Capsicum annuum grown in a pasteurized potting medium in a glasshouse or controlled environment growth chamber. Ten isolates reduced Damping-off and increased shoot weights, at least as well as the fungicide propamocarb, in both experiments. Eight isolates also reduced Damping-off in seedlings of Celosia argentea in another glasshouse experiment, and all 14 isolates tested increased shoot weights, but propamocarb had no significant effect on Damping-off or shoot weight. In another glasshouse experiment, four bacterial isolates were applied at five different doses to pasteurized potting medium with or without P. u. sporangiiferum. Capsicum seedlings were assayed for shoot growth and suppression of Damping-off. In the presence of Pythium, only one bacterial isolate showed a dose-response in seedling survival and shoot weights, but another isolate reduced Damping-off equally at all doses. In the absence of Pythium, all bacterial isolates increased shoot dry weights, but there were no responses to increased doses of bacteria. Bacillus subtilis A13 suppressed Damping-off in only one of four experiments.
A.r. Harris - One of the best experts on this subject based on the ideXlab platform.
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Suppression of Damping-off caused by Rhizoctonia solani, and growth promotion, in bedding plants by binucleate Rhizoctonia spp
Soil Biology & Biochemistry, 1994Co-Authors: A.r. Harris, D.a. Schisler, S.m. Neate, M.h. RyderAbstract:Abstract Nine isolates of binucleate Rhizoctonia spp, from potting media and nursery plants, were screened for their ability to control Damping-off disease caused by Rhizoctonia solani Kuhn AG 4 and AG 8. Seedlings of Capsicum annuum L. were grown in a pasteurized potting medium in growth chambers. All isolates prevented Damping-off caused by R. solani AG 4, and most isolates increased shoot weights in the presence of either AG 4 or AG 8. Two isolates were tested further on seedlings grown in pasteurized potting medium in a glasshouse. In two experiments, both isolates controlled Damping-off in Capsicum caused by AG 4. In another experiment, both isolates reduced Damping-off caused by AG 4 in Capsicum, Celosia and Viola seedlings, and increased shoot weights of Capsicum and Celosia. One isolate also reduced Damping-off in Petunia. Each isolate promoted shoot growth of seedlings in two of four experiments when no pathogen was added. As these binucleate Rhizoctonia isolates also control Pythium, they have potential for use as biological control agents in plant nurseries.
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Bacteria suppress Damping-off caused by Pythium ultimumvar. Sporangiiferum, and promote growth, in bedding plants
Soil Biology and Biochemistry, 1994Co-Authors: A.r. Harris, D.a. Schisler, M.h. Ryder, P.g. AdkinsAbstract:Abstract Fifteen isolates of bacteria, from potting media collected from South Australian plant nurseries and potting mix suppliers, were screened for ability to control Damping-off disease caused by Pythium ultimum var. sporangiiferum. The screening was by two bioassays on seedlings of Capsicum annuum grown in a pasteurized potting medium in a glasshouse or controlled environment growth chamber. Ten isolates reduced Damping-off and increased shoot weights, at least as well as the fungicide propamocarb, in both experiments. Eight isolates also reduced Damping-off in seedlings of Celosia argentea in another glasshouse experiment, and all 14 isolates tested increased shoot weights, but propamocarb had no significant effect on Damping-off or shoot weight. In another glasshouse experiment, four bacterial isolates were applied at five different doses to pasteurized potting medium with or without P. u. sporangiiferum. Capsicum seedlings were assayed for shoot growth and suppression of Damping-off. In the presence of Pythium, only one bacterial isolate showed a dose-response in seedling survival and shoot weights, but another isolate reduced Damping-off equally at all doses. In the absence of Pythium, all bacterial isolates increased shoot dry weights, but there were no responses to increased doses of bacteria. Bacillus subtilis A13 suppressed Damping-off in only one of four experiments.
J R Burns - One of the best experts on this subject based on the ideXlab platform.
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biocontrol of Damping off of catharanthus roseus caused by pythium ultimum with trichoderma virens and binucleate rhizoctonia fungi
Plant Disease, 2000Co-Authors: J R Burns, D M BensonAbstract:ABSTRACT Four isolates of Trichoderma (Gliocladium) virens (G-45, G-65, G-85, and G-93) and two isolates of binucleate Rhizoctonia spp. (BNR621 and P9023) were evaluated for biocontrol of preemergence Damping-off of Catharanthus roseus (vinca) caused by Pythium ultimum. Putative biocontrol agents were amended to a soilless mix 1, 3, or 6 days prior to seeding and pathogen infestation to determine if colonization of the mix before infestation was important for biocontrol efficacy. Biocontrol of preemergence Damping-off of vinca with the four isolates of T. virens was variable. Only isolate G-93 gave control of preemergence Damping-off (10 to 18% disease) regardless of the length of time the mix was amended prior to seeding and infestation compared to the infested control (43% disease). In contrast, preemergence Damping-off was 10 to 15% with SoilGard (based on isolate GL-21 of T. virens). For isolate G-65, preemergence Damping-off of vinca was 0% in lots of mix amended 1 day prior to seeding, but over 60% ...
Walter F Mahaffee - One of the best experts on this subject based on the ideXlab platform.
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compost tea as a container medium drench for suppressing seedling Damping off caused by pythium ultimum
Phytopathology, 2004Co-Authors: Steven J Scheuerell, Walter F MahaffeeAbstract:ABSTRACT Compost tea is being used increasingly in agricultural production to control plant diseases. However, there has been limited investigation relating disease control efficacy to various compost tea production methods, particularly compost tea produced with active aeration and additives to increase microbial population densities in compost tea. Aerated compost tea (ACT) and nonaerated compost tea (NCT), produced with or without additives, was investigated for the suppression of Damping-off of cucumber caused by Pythium ultimum. Compost tea was used to drench soilless container medium inoculated with P. ultimum; effect on Damping-off ranged from not suppressive to consistently suppressive depending on the method used to produce the tea. The most consistent formulation for Damping-off suppression was ACT produced with kelp and humic acid additives. Producing ACT with a molasses-based additive inconsistently suppressed Damping-off; evidence suggests that residual nutrients can interfere with disease su...
