Control of damping-off and root rot diseases of Acacia tree using some biological control agents and plant extracts

2020 ◽  
Vol 21 (1) ◽  
Keyword(s):  
Biological Control ◽  
Plant Extracts ◽  
Root Rot ◽  
Biological Control Agents ◽  
Damping Off ◽  
Acacia Tree

scholarly journals Effect of Plant Extracts and Biological control agents on Rhizoctonia solani Kuhn

2021 ◽  
Vol 735 (1) ◽  
pp. 012079
Author(s):  
Muneer Saeed M. Al-Baldawy ◽  
Ahed A A H Matloob ◽  
Mohammed K. N. Almammory
Keyword(s):  
Biological Control ◽  
Rhizoctonia Solani ◽  
Plant Extracts ◽  
Biological Control Agents

The in vitro inhibition of Phytophthora clandestina by some rhizobia and the possible role of Rhizobium trifolii in biological control of Phytophthora root rot of subterranean clover

1999 ◽  
Vol 50 (8) ◽  
pp. 1469 ◽  
Author(s):  
S. Simpfendorfer ◽  
T. J. Harden ◽  
G. M. Murray
Keyword(s):  
Biological Control ◽  
Root Rot ◽  
Subterranean Clover ◽  
Trifolium Subterraneum ◽  
Root Disease ◽  
Rhizobium Trifolii ◽  
Biological Control Agents ◽  
Control Activity ◽  
Phytophthora Root Rot

The interaction between 29 isolates of Rhizobium and the in vitro growth of 3 strains of Phytophthora clandestina was investigated to determine the potential of these bacteria as biological control agents against root rot of subterranean clover (Trifolium subterraneum L.). The biological control activity of Rhizobium on the severity of root disease in seedlings was also investigated under glasshouse conditions. Thirteen of the 29 Rhizobium isolates caused significant reductions in the hyphal growth of the 3 P. clandestina isolates examined. Inoculation of seedlings with Rhizobium trifolii reduced the severity of root disease by 14–58% with corresponding increases in dry matter production of 20–73%. These results indicate that Rhizobium species have potential as biological control agents against the root rot of T. subterraneum seedlings caused by P. clandestina.

scholarly journals Application of plant extracts and Trichoderma harzianum for the management of tomato seedling damping-off caused by Rhizoctonia solani

2020 ◽  
Vol 116 (11/12) ◽  
Author(s):  
Mapula T.P. Hlokwe ◽  
Mapotso Kena ◽  
David N. Mamphiswana
Keyword(s):  
Biological Control ◽  
Rhizoctonia Solani ◽  
Plant Extracts ◽  
Trichoderma Harzianum ◽  
Moringa Oleifera ◽  
Plant Diseases ◽  
Yield Reduction ◽  
Biotic Factors ◽  
Damping Off ◽  
Tomato Seedling

Seedling production under smallholder farming systems can be negatively affected by both abiotic and biotic factors. Seedling damping-off caused by Rhizoctonia solani is one of the major biotic factors which causes significant yield reduction. Management is mainly based on the application of synthetic fungicides and cultural practices. However, both methods have limitations which result in their inefficiency. Several studies have reported on the use of plant extracts and biological control to manage plant diseases. The aim of this study was to formulate an effective and practical approach to manage tomato seedling dampingoff using extracts of Monsonia burkeana and Moringa oleifera and a biological control agent Trichoderma harzianum. The efficacy of both extracts was investigated under laboratory conditions to determine the most suppressive concentration to R. solani growth. Methanolic extracts from both plants significantly suppressed pathogen growth at different concentrations. M. burkeana significantly reduced R. solani growth at 8 g/mL (71%) relative to control whilst Moringa oleifera extract reduced pathogen growth by 60% at a concentration of 6 g/mL. The highest suppressive concentrations were further evaluated under greenhouse conditions to test their efficacy on seedling damping-off. In damping-off treatments, both plant extracts and T. harzianum also significantly reduced (p=0.5) pre- and post-emergence dampingoff incidence. M. burkeana recorded the highest suppression at 78%, followed by M. oleifera at 64%. Trichoderma harzianum reduced incidence of damping-off by 60% and this was higher than both plant extract treatments.

Efficacy of Chemical and Biological Agents to Suppress Fusarium and Pythium Damping-Off of Container-Grown Douglas-fir Seedlings

2008 ◽  
Vol 9 (1) ◽  
pp. 20 ◽  
Author(s):  
Robert G. Linderman ◽  
E. Anne Davis ◽  
Charles J. Masters
Keyword(s):  
Biological Control ◽  
Douglas Fir ◽  
Biological Agents ◽  
Biological Control Agents ◽  
Damping Off ◽  
Pythium Irregulare ◽  
Plant Soil ◽  
Container Nurseries ◽  
Steam Pasteurization ◽  
Conifer Seedling

Douglas-fir seedlings are susceptible to Fusarium or Pythium damping-off that currently is controlled by pre-plant soil fumigation in bareroot nurseries and steam pasteurization or chemical drenches of soilless media in container nurseries. However, because few chemical or biological agents are registered for use on conifer seedlings, we tested several on greenhouse-grown seedlings and found that over-seed applications of Cleary's 3336, Strike, Compass, Compass + Strike, Cygnus, Endura, Medallion, Medallion + Strike, Thiram, and Enzone effectively suppressed pre-emergence damping-off by Fusarium oxysporum, but only Cleary's 3336WP and Medallion + Strike also reduced post-emergence damping-off. Compass, Medallion, and Thiram reduced post-emergence damping-off, but not to a statistically significant level. Pre-emergence damping-off by Pythium irregulare was reduced only by Ranman, but post-emergence damping-off was reduced by Thiram, Hurricane, Ranman, and Subdue MAXX. Over-seed drenches of biological control agents Companion, Kodiak, Subtilex, Taegro, Primastop, SoilGard, Actinovate, Mycostop, RootShield, and Green-Releaf were ineffective in suppressing either Fusarium or Pythium diseases, and combining several agents with chemicals did not improve efficacy. These results provide data in support of registration of some of the effective chemicals, but no biological control agents, for the control of conifer seedling damping-off. Accepted for publication 14 January 2008. Published 17 March 2008.

scholarly journals Biological Control of Damping-Off of Tomato Seedlings and Cucumber Phomopsis Root Rot by Bacillus subtilis RB14-C

2005 ◽  
Vol 39 (2) ◽  
pp. 109-114 ◽  
Author(s):  
Nobuhiro KITA ◽  
Takeshi OHYA ◽  
Hidetoshi UEKUSA ◽  
Ken NOMURA ◽  
Masahumi MANAGO ◽  
...  
Keyword(s):  
Biological Control ◽  
Bacillus Subtilis ◽  
Root Rot ◽  
Damping Off ◽  
Tomato Seedlings

scholarly journals Effect of Potting Mix Microbial Carrying Capacity on Biological Control of Rhizoctonia Damping-Off of Radish and Rhizoctonia Crown and Root Rot of Poinsettia

2001 ◽  
Vol 91 (11) ◽  
pp. 1116-1123 ◽  
Author(s):  
Matthew S. Krause ◽  
Laurence V. Madden ◽  
Harry A. J. Hoitink
Keyword(s):  
Biological Control ◽  
Carrying Capacity ◽  
Root Rot ◽  
Biocontrol Agents ◽  
Pine Bark ◽  
Damping Off ◽  
Indigenous Microorganisms ◽  
Sphagnum Peat ◽  
Trichoderma Hamatum ◽  
Crown And Root Rot

Potting mixes prepared with dark, highly decomposed Sphagnum peat, with light, less decomposed Sphagnum peat, or with composted pine bark, all three of which were colonized by indigenous microorganisms, failed to consistently suppress Rhizoctonia damping-off of radish or Rhizoctonia crown and root rot of poinsettia. Inoculation of these mixes with Chryseobacterium gleum (C299R2) and Trichoderma hamatum 382 (T382) significantly reduced the severity of both diseases in the composted pine bark mix in which both biocontrol agents maintained high populations over 90 days. These microorganisms were less effective against damping-off in the light and dark peat mixes, respectively, in which populations of C299R2 declined. In contrast, crown and root rot, a disease that is severe late in the crop, was suppressed in all three types of mixes. High populations of T382 in all three mixes late during the cropping cycle may have contributed to control of this disease.

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