Plant health and yield of dry bean not affected by strobilurin fungicides under disease-free or simulated hail conditions

Mahoney, Kris J.; GillardC., L.

doi:10.4141/cjps-2014-159

Cited by 10 publications

(6 citation statements)

References 28 publications

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“…and winter wheat yield with strobilurin fungicides applied in a low disease pressure environment. Similarly, Bradley and Ames (2010) and Mahoney and Gillard (2014) observed no yield benefit or a reduction of simulated hail damage on corn or dry bean ( Phaseolus vulgaris L.) when applied with either pyraclostrobin or azoxystrobin. Brosnan et al (2010) observed significant increases in root length and root length density in Penn A‐1 creeping bentgrass after applications of pyraclostrobin compared to the nontreated control in a greenhouse environment.…”

Section: Discussionmentioning

confidence: 98%

Plant Health Characteristics of Creeping Bentgrass Affected by Strobilurin Fungicide Applications and Turfgrass Diseases

et al. 2016

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Previous research has indicated that strobilurin fungicide applications may mitigate the effects of summer heat stress on creeping bentgrass (Agrostis stolonifera L.). Two multi‐year experiments were conducted in 2011 and 2012 to evaluate plant health characteristics following strobilurin fungicide applications to creeping bentgrass putting greens. In Exp. 1, pyraclostrobin, azoxystrobin, fluoxastrobin, or trifloxystrobin were integrated within a conventional summer fungicide program. In Exp. 2, repeated applications of strobilurin fungicides were evaluated in absence of visible foliar disease. To limit foliar disease, overspray applications of chlorothalonil (2,4,5,6‐tetrachloroisophthalonitrile) and iprodione [3‐(3,5‐dichlorophenyl)‐N‐isopropyl‐2,4‐dioxoimidazolidine‐1‐carboxamide] were applied over the experimental units. The plant health characteristics evaluated were visual quality, spectral reflectance, percent green cover, and root morphology. Disease incidence and severity was also quantified visually. In Exp. 1, the nontreated control was similar to strobilurin fungicide programs in all parameters in 2011. In 2012, strobilurin fungicide programs exhibited improved normalized difference vegetation index (NDVI), ratio vegetation index (RVI), turfgrass quality, and percent green cover compared to the nontreated control. Disease severity also increased in 2012 compared to 2011. In Exp. 2, repeated applications of strobilurin fungicides did not affect measured parameters compared to the nontreated control when foliar diseases were managed with fungicides chlorothalonil and iprodione. In these experiments, differences in NDVI, RVI, turfgrass quality, and percent green cover often coincided with differences in disease severity in our evaluations. Under the conditions of these studies, applications of strobilurin fungicides have limited effects on NDVI, RVI, turfgrass quality, and percent green cover in the absence of visible disease.

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Section: Discussionmentioning

confidence: 98%

Plant Health Characteristics of Creeping Bentgrass Affected by Strobilurin Fungicide Applications and Turfgrass Diseases

et al. 2016

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“…In fact, there are reports in literature in which the application of pyraclostrobin did not affect the photosynthetic efficiency in corn plants in the absence of diseases (Junqueira et al, 2017) and of four soybean varieties (Swoboda and Pedersen, 2009). The final yield of common bean was not affected by the application of azoxystrobin and pyraclostrobin (Mahoney and Gillard, 2014). The application of azoxystrobin in wheat, barley and soybean (Nason et al, 2007), rice (Debona et al, 2016) and Japanese cucumber (Amaro et al, 2018), decreased the net CO 2 assimilation rate, transpiration, stomatal conductance and internal carbon dioxide concentration leading to a decrease in the photosynthetic efficiency of these plants.…”

Section: Introductionmentioning

confidence: 95%

Photoynthetic and productive increase in tomato plants treated with strobilurins and carboxamides for the control of Alternaria solani

Marek

Azevedo

Ono

et al. 2018

Scientia Horticulturae

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A B S T R A C TDuring two years (2015 and 2016), an experiment was carried out to investigate the effects of the application of strobilurin and carboxamides on the photosynthetic efficiency and yield of tomato plants inoculated with A. solani grown in greenhouse in southern Brazil. The experimental design was randomized blocks with five replicates and seven treatments: inoculated control (water + inoculum), absolute control (water), boscalid (0.075 g L −1 ), boscalid (0.100 g L −1 ) + kresoxim-methyl (0.050 g L −1 ), pyraclostrobin (0.100 g L −1 ), fluxapyroxad (0.058 g L −1 ) + pyraclostrobin (0.116 g L −1 ) and methyl (1.100 g L −1 ) + pyraclostrobin (0.100 g L −1 ), applied at 15 days after transplantation, at intervals of 15 days, totaling 6 applications. The effect on plant development was evaluated by plant height, leaf area, fresh and dry mass of leaves, stem and roots. To verify the photosynthetic efficiency, gas exchange, chlorophyll a fluorescence, content of photosynthetic pigments, nitrate reductase enzyme activity, carbohydrate content and yield were evaluated. All fungicides positively affected the evaluated parameters, improving photosynthetic efficiency and fruit production, in addition to providing efficient disease control. However, treatments using fluxapyroxad with pyraclostrobin, followed by metiram with pyraclostrobin stood out for promoting high photochemical yield due to the higher levels of photosynthetic pigments, activity of the nitrate reductase enzyme and, consequently, increase in the synthesis and translocation of photoassimilates. These results demonstrate the benefits of the use of these agrochemicals in the control of A. solani in tomato.

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“…This plant health benefit of the QoI-fungicide was reported by Dimmock and Gooding (2002) to prolong grain filling in wheat crops. Furthermore, QoI-fungicide was reported to lower transpiration rates and also reduce the rate of senescence in wheat plants (Petit et al, 2012; Mahoney et al, 2014). …”

Section: Introductionmentioning

confidence: 99%

The Detection and Characterization of QoI-Resistant Didymella rabiei Causing Ascochyta Blight of Chickpea in Montana

et al. 2017

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Ascochyta blight (AB) of pulse crops (chickpea, field pea, and lentils) causes yield loss in Montana, where 1.2 million acres was planted to pulses in 2016. Pyraclostrobin and azoxystrobin, quinone outside inhibitor (QoI) fungicides, have been the choice of farmers for the management of AB in pulses. However, a G143A mutation in the cytochrome b gene has been reported to confer resistance to QoI fungicides. A total of 990 isolates of AB-causing fungi were isolated and screened for QoI resistance. Out of these, 10% were isolated from chickpea, 81% were isolated from field peas, and 9% isolated from lentil. These were from a survey of grower’s fields and seed lots (chickpea = 17, field pea = 131, and lentil = 21) from 23 counties in Montana sent to the Regional Pulse Crop Diagnostic Laboratory, Bozeman, MT, United States for testing. Fungicide-resistant Didymella rabiei isolates were found in one chickpea seed lot each sent from Daniels, McCone and Valley Counties, MT, from seed produced in 2015 and 2016. Multiple alignment analysis of amino acid sequences showed a missense mutation that replaced the codon for amino acid 143 from GGT to GCT, introducing an amino acid change from glycine to alanine (G143A), which is reported to be associated with QoI resistance. Under greenhouse conditions, disease severity was significantly higher on pyraclostrobin-treated chickpea plants inoculated with QoI-resistant isolates of D. rabiei than sensitive isolates (p-value = 0.001). This indicates that where resistant isolates are located, fungicide failures may be observed in the field. D. rabiei-specific polymerase chain reaction primer sets and hydrolysis probes were developed to efficiently discriminate QoI- sensitive and - resistant isolates.

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Plant health and yield of dry bean not affected by strobilurin fungicides under disease-free or simulated hail conditions

Cited by 10 publications

References 28 publications

Plant Health Characteristics of Creeping Bentgrass Affected by Strobilurin Fungicide Applications and Turfgrass Diseases

Plant Health Characteristics of Creeping Bentgrass Affected by Strobilurin Fungicide Applications and Turfgrass Diseases

Photoynthetic and productive increase in tomato plants treated with strobilurins and carboxamides for the control of Alternaria solani

The Detection and Characterization of QoI-Resistant Didymella rabiei Causing Ascochyta Blight of Chickpea in Montana

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