Long-term activity of bio-priming seed treatment for biological control of faba bean root rot pathogens

2008 ◽  
Vol 37 (5) ◽  
pp. 464 ◽  
Author(s):  
N. S. El-Mougy ◽  
M. M. Abdel-Kader
Keyword(s):  
Biological Control ◽  
Faba Bean ◽  
Root Rot ◽  
Seed Treatment ◽  
Bean Root

scholarly journals Essential Oils and Trichoderma Harzianum as an Integrated Control Measure Against Faba Bean Root Rot Pathogens

2011 ◽  
Vol 51 (3) ◽  
pp. 306-313 ◽  
Author(s):  
Mokhtar Abdel-Kader ◽  
Nehal El-Mougy ◽  
Sirag Lashin
Keyword(s):  
Essential Oils ◽  
Faba Bean ◽  
Trichoderma Harzianum ◽  
Root Rot ◽  
Mycelial Growth ◽  
Control Measure ◽  
Disease Incidence ◽  
Integrated Control ◽  
Yield Increase ◽  
Bean Root

Essential Oils andTrichoderma Harzianumas an Integrated Control Measure Against Faba Bean Root Rot PathogensCarnation, caraway, thyme, peppermint and geranium essential oils have been found to have inhibitory effects against the mycelial growth ofFusarium solani,Rhizoctonia solani,Sclerotium rolfsiiandMacrophomina phaseolinaunderin vitroconditions. Complete inhibition of fungal growth was observed with the use of 4% carnation and geranium oils. Mycelial growth of the tested fungi showed more sensitivity to high concentrations of thyme than to caraway and peppermint oils. Moreover, essential oils used to coat seeds resulted in a significant reduction of root rot incidence of bean, at both pre- and post-emergence stages under greenhouse conditions. Under field conditions seeds coated with essential oils at a concentration of 4% sown in soil treated with the bio-agentTrihoderma harzianum, gave pronounced protection to emerged bean seeds against the invasion of root rot pathogenic fungi. Compared to the control, the above treatment resulted in a reduction of disease incidence at the pre-emergence stage. This reduction was calculated to be between 47.3 and 55.4% compared with a 16.1% reduction with the use of the Rizolex-T treatment. At the post-emergence stage, all applied treatments were able to reduce the percentage of root-rot incidence. Reduction ranged between 41.4 and 47.1% over the untreated control. Reduction in disease incidence was reflected in a yield increase of 15.1-28.8% and 40.1-50%, in seeds coated with one of the different essential oils, or combined withT. harzianumsoil treatments, in the respective order. Seeds coated with the fungicide Rhizolex-T caused a yield increase estimated as 11.3% over the check treatment. These results show that application of essential oils in integration with the bio-agentT. harzianummay be considered as an applicable, safe and cost-effective method for controlling such soilborne diseases.

scholarly journals Burkholderia SP. Strain TNAU-1 for Biological Control of Root Rot in Mung Bean (Vigna Radiata L.) Caused by Macrophomina Phaseolina

2011 ◽  
Vol 51 (3) ◽  
pp. 273-278 ◽  
Author(s):  
Vijayalakshmi Satya ◽  
Ayyathurai Vijayasamundeeswari ◽  
Vaikuntavasan Paranidharan ◽  
Rethinasamy Velazhahan
Keyword(s):  
Biological Control ◽  
Root Rot ◽  
Vigna Radiata ◽  
Mung Bean ◽  
Seed Treatment ◽  
Macrophomina Phaseolina ◽  
Bacterial Suspension ◽  
Seedling Vigour ◽  
Soil Application ◽  
Powder Formulation

BurkholderiaSP. Strain TNAU-1 for Biological Control of Root Rot in Mung Bean (Vigna RadiataL.) Caused byMacrophomina PhaseolinaThe potential ofBurkholderiasp. strain TNAU-1 for the management of mung bean (Vigna radiataL.) root rot caused byMacrophomina phaseolinawas evaluated under greenhouse conditions.Burkholderiasp. strain TNAU-1 inhibited the mycelial growth ofM. phaseolina in vitroand produced an inhibition zone of 18.8 mm. Mung bean seeds when treated with the bacterial suspension, showed significant increase in root length, shoot length and seedling vigour. A talc-based powder formulation ofBurkholderiasp. strain TNAU-1 was developed and evaluated for its efficacy in the management of mung bean root rot under greenhouse conditions. Seed treatment or soil application of the powder formulation ofBurkholderiasp. strain TNAU-1 significantly reduced the incidence of root rot and increased the germination percentage and plant height. Seed treatment with the powder formulation ofBurkholderiasp. strain TNAU-1 alone was effective in controlling root rot disease; but the combined seed treatment and soil application ofBurkholderiasp. strain TNAU-1, increased the efficacy. Seed treatment and soil application withBurkholderiasp. reduced the root rot incidence from 52.6 per cent (with non-bacterized seeds) to 16.7 per cent. Control of root rot with the application ofBurkholderiasp. by seed treatment and soil application was not statistically different from that obtained with seed treatment with carbendazim. The endophytic movement ofBurkholderiasp. in the stem, roots and leaves of mung bean was confirmed through PCR usingBurkholderiasp. specific primers which resulted in the amplification of a 417 bp product.

scholarly journals Factors Affecting Root Rot Control in Mulched Avocado Orchards

2002 ◽  
Vol 12 (4) ◽  
pp. 601-605 ◽  
Author(s):  
Jim Downer ◽  
Ben Faber ◽  
John Menge
Keyword(s):  
Biological Control ◽  
Enzyme Activities ◽  
Root Rot ◽  
Phytophthora Cinnamomi ◽  
Soil Water Potential ◽  
Persea Americana ◽  
Long Term Effects ◽  
Short Term ◽  
Cellulase Enzyme

Mulches can exert positive (disease controlling) or negative (disease enhancing) potential when applied to young avocado (Persea americana) trees. Regulation of root disease in avocado is a complicated process that is affected by host resistance, inoculum density, temperature, soil salinity and soil water potential. There are short-term immediate effects from mulching and subtle long-term effects that regulate disease caused by the root rot pathogen Phytophthora cinnamomi. Short-term effects include increased soil moisture and soil temperature moderation. Long-term effects include increases of: soil mineral nutrients, soil aggregation and drainage; microbial activity; and cellulase enzyme activities. Biological control of Phytophthora in mulched soil is partially regulated by cellulase enzyme activities. This soil enzyme concept of biological control is discussed in regard to the classical Ashburner method of biological control.

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