Efficacy of organic disease control products on common foliar diseases of tomato in field and greenhouse trials

Egel, Dan; Hoagland, Lori; Davis, Jerry W.; Marchino, Curtis; Bloomquist, Mark

doi:10.1016/j.cropro.2019.04.022

Cited by 20 publications

(13 citation statements)

References 38 publications

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“…In this regard, emergence of multiple A. solani isolates 62 , with enhanced resistance against fungicides such as azoxystrobin, pyraclostrobin 63 , mancozeb and chlorothalonil 64 , ignites the need for the development of sustainable disease management strategies duly harmonized with the environment. Therefore, the current study was conducted with the aim of developing a novel, sustainable and economically viable approach to enhance crop productivity by reducing pathogen induced losses without damaging the diversity of life around 65 .…”

Section: Discussionmentioning

confidence: 99%

Role of biochar, compost and plant growth promoting rhizobacteria in the management of tomato early blight disease

Rasool

Akhter

Soja

et al. 2021

Sci Rep

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The individual role of biochar, compost and PGPR has been widely studied in increasing the productivity of plants by inducing resistance against phyto-pathogens. However, the knowledge on combined effect of biochar and PGPR on plant health and management of foliar pathogens is still at juvenile stage. The effect of green waste biochar (GWB) and wood biochar (WB), together with compost (Comp) and plant growth promoting rhizobacteria (PGPR; Bacillus subtilis) was examined on tomato (Solanum lycopersicum L.) physiology and Alternaria solani development both in vivo and in vitro. Tomato plants were raised in potting mixture modified with only compost (Comp) at application rate of 20% (v/v), and along with WB and GWB at application rate of 3 and 6% (v/v), each separately, in combination with or without B. subtilis. In comparison with WB amended soil substrate, percentage disease index was significantly reduced in GWB amended treatments (Comp + 6%GWB and Comp + 3%GWB; 48.21 and 35.6%, respectively). Whereas, in the presence of B. subtilis disease suppression was also maximum (up to 80%) in the substrate containing GWB. Tomato plant growth and physiological parameters were significantly higher in treatment containing GWB (6%) alone as well as in combination with PGPR. Alternaria solani mycelial growth inhibition was less than 50% in comp, WB and GWB amended growth media, whereas B. subtilis induced maximum inhibition (55.75%). Conclusively, the variable impact of WB, GWB and subsequently their concentrations in the soil substrate was evident on early blight development and plant physiology. To our knowledge, this is the first report implying biochar in synergism with PGPR to hinder the early blight development in tomatoes.

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Section: Discussionmentioning

confidence: 99%

Role of biochar, compost and plant growth promoting rhizobacteria in the management of tomato early blight disease

Rasool

Akhter

Soja

et al. 2021

Sci Rep

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“…The biocontrol efficiency of the isolate rosea 2 (formerly identified as NCR61) against grey mould disease of rose, strawberry, and tomato was known from previous reports (Cota et al, 2008; Morandi et al, 2003). Efficient biocontrol of tomato early blight, caused by A. solani , in greenhouse trials and in organic farm plots was achieved using the bioproduct Prestop (Egel et al, 2019), which is composed of conidia from strain J1446 of “ Gliocladium catenulatum ”, an obsolete name for C. rosea f. catenulata (Schroers, 2001).…”

Section: Discussionmentioning

confidence: 99%

“…These characteristics make early blight a good target for biocontrol aiming towards either the protection of plant surfaces or eradication of inoculum in the field. Biofungicides containing Bacillus strains capable of producing antifungal compounds are registered for the biocontrol of Alternaria species causing potato early blight and other foliar diseases in the field (Egel et al, 2019; MAPA, 2020). Fungal biocontrol agents possess different modes of interaction with plant pathogens and host plants, such as mycoparasitism, which may add to the effects provided by bacteria.…”

Section: Introductionmentioning

confidence: 99%

Biocontrol of potato early blight and suppression of Alternaria grandis sporulation by Clonostachys spp.

et al. 2021

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Early blight, caused by Alternaria solani and A. grandis, severely affects potato crops around the world, and few management options apart from intensive fungicide use are available. In this work, we tested whether biocontrol treatments with different species of the mycoparasitic fungus Clonostachys could reduce early blight severity on the foliage of pot‐grown potatoes of cultivar Ágata, and affect the survival and sporulation of the causal pathogen A. grandis. Twenty isolates from five Clonostachys species were screened in a preliminary biocontrol trial, and nine of them were selected and tested further in two confirmation trials. Treatments with three isolates from three species (C. chloroleuca, C. pseudochroleuca, C. rhizophaga) resulted in a significant reduction in disease severity in both confirmation trials, with control efficacy ranging from 88.7% to 92.9% in the first trial, and from 83.1% to 84.7% in the second trial. All Clonostachys isolates used in the confirmation trials survived on potato leaf tissues for at least 15 days, and resumed growth when subjected to high humidity, resulting in mycoparasitic overgrowth and significant reduction of the pathogen sporulation. Our results provide evidence that different species of Clonostachys, not only the ubiquitous C. rosea, are sources of useful candidates for the biocontrol of potato early blight and possibly other plant diseases caused by fungal pathogens.

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“…The highest reduction in lesion size in greenhouse trials was observed in plants treated by Serenade ® alone or in combination with other treatments. According to the literature, B. subtilis can control a wide variety of pathogens in different plants (Collins and Jacobsen, 2003;Lahlali et al, 2013;Abbasi and Weselowski, 2014;Egel et al, 2019). B. subtilis can colonize the leaf surface and compete with A. solani for space and nutrients and physically prevent penetration of the pathogen into the leaves (Abbasi and Weselowski, 2014) Secondary metabolites and lipopeptides have also been found to reduce the lesion size of A. solani in potato (Abbasi and Weselowski, 2014).…”

Section: The Efficiency Of Bcas For the Control Of Early Blightmentioning

confidence: 99%

“…Treatments with Serenade MAX also significantly reduced early blight infection in field trials for tomatoes conducted in 2009. Egel et al (2019) studied the effect of Serenade ® in the management of A. solani on tomato plants in greenhouse and two field sites, where the field sites had different climatic conditions. In the greenhouse studies, Serenade ® was used alone as a treatment and it significantly decreased early blight disease levels in two out of three greenhouse trials.…”

Section: Introductionmentioning

confidence: 99%

Reduced efficacy of biocontrol agents and plant resistance inducers against potato early blight from greenhouse to field

et al. 2022

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Early blight in potato, caused by Alternaria solani, is mainly controlled by frequent applications of synthetic fungicides. Reducing the use of synthetic fungicides in agriculture is desired to reach an overall sustainable development since the active components can be harmful for humans and for the ecosystem. In integrated pest management, IPM, the idea is to combine various measures, including optimized crop management, crop rotation, use of resistant cultivars, biological control agents (BCAs), plant resistance inducers, and fertilizers, to decrease the dependence on traditional chemical fungicides. In this paper, we present the results from greenhouse and field trials where we evaluated the effect of strategies aimed at reducing our reliance on synthetic fungicides including treatments with biological control agents (BCAs) (Pythium oligandrum, Polygandron®, and Bacillus subtilis, Serenade®) and plant resistance inducers (silicon products HortiStar® and Actisil®) for early blight in potato. The agents were applied separately or in combination with each other or with synthetic fungicides. In the greenhouse, trials application of these agents resulted in 50–95% reduction of infection by A. solani, but their combination did not generally improve the outcome. However, the effects were much smaller in the hand-sprayed field trials, 20–25% disease reduction and almost disappeared in full-scale field trials where application was done with tractor sprayers. In this article, we discuss possible reasons behind the drop in efficacy from greenhouse trials to full-size field evaluation.

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Efficacy of organic disease control products on common foliar diseases of tomato in field and greenhouse trials

Cited by 20 publications

References 38 publications

Role of biochar, compost and plant growth promoting rhizobacteria in the management of tomato early blight disease

Role of biochar, compost and plant growth promoting rhizobacteria in the management of tomato early blight disease

Biocontrol of potato early blight and suppression of Alternaria grandis sporulation by Clonostachys spp.

Reduced efficacy of biocontrol agents and plant resistance inducers against potato early blight from greenhouse to field

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