Control Effect on Dollar Spot Disease Caused by Sclerotinia homoeocarpa under Different Application Rates and Intervals with Two Mixed Fungicides

Chang, Sung Ok; Jung, Suk-Woo; Kim, Sehun; Park, Jong‐Hyun; Lee, Ji-Young

doi:10.5660/wts.2013.2.4.408

Cited by 3 publications

(2 citation statements)

References 11 publications

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“…QuEChERs methods have been well coordinated to mass spectrometry as multiresidue analytical methods for the determination of pesticides in agricultural food stuffs [4][5][6]. Acetamiprid, boscalid, imidacloprid and pyraclostrobin are one of pesticides widely used to control pest insects and plant pathogens in greenhouse [7][8][9][10][11]. According to National Agricultural Products Quality Management Service (NAQS), they are one of the major pesticides that have been detected in agricultural soil samples by yearly domestic pesticide monitoring program.…”

Section: Introductionmentioning

confidence: 99%

Residues Analysis of Acetamiprid, Boscalid, Imidacloprid and Pyraclostrobin in the Minor Crop Mustard Green under Greenhouse Conditions for Evaluation of their Potentiality of PLS Violation

Kim¹,

Kim²,

Lim³

et al. 2020

Korean Journal of Environmental Agriculture

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BACKGROUND: The demand for pesticide registration has kept increasing for minor crop cultivation in greenhouse since Positive List System (PLS) has been launched. Thus, much study on the evaluation of pesticide residues in minor crops is required to examine the demand. In this study, we evaluated residues of acetamiprid, boscalid, imidacloprid and pyraclostrobin in the minor crop mustard green to provide the potential data for their registration. METHODS AND RESULTS: Pesticide granule formulations of acetamiprid, boscalid, imidacloprid and pyraclostrobin were incorporated into soil and applied onto field soil surface at rates of 3 kg/10a, 6 kg/10a, 3 kg/10a and 6 kg/10a, respectively. The pesticides were also applied at the two times higher than the rates to compare the residues between the application rates. Mustard green seeds were sown 1 day after pesticide application and cultivated under greenhouse conditions. LC/MS/MS analyses coupled with a modified QuEChERs method were employed for determination of the pesticides in plant samples. The method limits of quantitation (LOQ) of the pesticides were 0.01 mg/kg, and the matrix calibration curves of the pesticides showed linearity with coefficient values of determination (r 2) greater than 0.995. The average recovery values of the pesticides fortified in control samples at rates of LOQ and 10LOQ ranged from approximately 77.5% to 101.2% with relative standard deviation values lower than 14%. The pesticides in the mustard green samples cultivated for 53 days after sown were determined to be lower than the LOQ level. CONCLUSION: Acetamiprid, boscalid, imidacloprid and pyraclostrobin were found at a level lower than 0.01 mg/kg in the minor crop mustard green. Thus, their residues in mustard green would not violate PLS under greenhouse conditions.

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Section: Introductionmentioning

confidence: 99%

Residues Analysis of Acetamiprid, Boscalid, Imidacloprid and Pyraclostrobin in the Minor Crop Mustard Green under Greenhouse Conditions for Evaluation of their Potentiality of PLS Violation

Kim¹,

Kim²,

Lim³

et al. 2020

Korean Journal of Environmental Agriculture

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“…The ascomycete fungus Sclerotinia homoeocarpa (Order: Pezizales, Family: Sclerotiniaceae) causes dollar spot, one of the most common and destructive fungal diseases on intensively managed turfgrasses in North America ( Smith et al, 1989 ; Subbarao et al, 1995 ) and Korea ( Chang et al, 2011 ). It is most prevalent on golf courses, and turfgrass damage from dollar spot is most severe during the growing season from spring to fall ( Chang et al, 2012 and 2013 ; Smiley, 2005 ). Warm and humid daytime conditions coupled with cool nights promote extended periods of leaf wetness, which is particularly conducive to disease development.…”

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Evidence for Genetic Similarity of Vegetative Compatibility Groupings in Sclerotinia homoeocarpa

Chang¹,

Chang

et al. 2014

The Plant Pathology Journal

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Vegetative compatibility groups (VCGs) are determined for many fungi to test for the ability of fungal isolates to undergo heterokaryon formation. In several fungal plant pathogens, isolates belonging to a VCG have been shown to share significantly higher genetic similarity than those of different VCGs. In this study we sought to examine the relationship between VCG and genetic similarity of an important cool season turfgrass pathogen, Sclerotinia homoeocarpa. Twenty-two S. homoeocarpa isolates from the Midwest and Eastern US, which were previously characterized in several studies, were all evaluated for VCG using an improved nit mutant assay. These isolates were also genotyped using 19 microsatellites developed from partial genome sequence of S. homoeocarpa. Additionally, partial sequences of mitochondrial genes cytochrome oxidase II and mitochondrial small subunit (mtSSU) rRNA, and the atp6-rns intergenic spacer, were generated for isolates from each nit mutant VCG to determine if mitochondrial haplotypes differed among VCGs. Of the 22 isolates screened, 15 were amenable to the nit mutant VCG assay and were grouped into six VCGs. The 19 microsatellites gave 57 alleles for this set. Unweighted pair group methods with arithmetic mean (UPGMA) tree of binary microsatellite data were used to produce a dendrogram of the isolate genotypes based on microsatellite alleles, which showed high genetic similarity of nit mutant VCGs. Analysis of molecular variance of microsatellite data demonstrates that the current nit mutant VCGs explain the microsatellite genotypic variation among isolates better than the previous nit mutant VCGs or the conventionally determined VCGs. Mitochondrial sequences were identical among all isolates, suggesting that this marker type may not be informative for US populations of S. homoeocarpa.

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A Detail Investigation of Major Diseases Occurrence and Pathogen Population on Turfgrass Cultivation in Nationwide

Min¹,

Lee²,

Kwak³

2014

Weed & Turfgrass Science

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We investigated turfgrass diseases and inoculum density at nationwide turfgrass cultivation sites in year of 2013. Occurrences of large patch and rust disease appeared in September. Brown patch recorded in September to October at Namhea and Pythium blight disease occurred outbreaks in early July at Namhea site. Some sites in Namhea damaged 3% area of total cultivation field by Sclerotinia homoeocarp. In Daepyeong (Gyeongnam), Fairy ring and large patch were recorded. Severe takeall and fairy ring have been observed in Gochang-si. Multi-site in Cheongju-si, brown patch was observed in pandemic level. Interesting enough, a cool-season turfgrass cultivate sites in Pyeongtaek-si brown patch, leaf blast, summer patch, and Curvularia leaf spot were investigated during the surveys period. Inoculum densities (Rhizoctonia spp.) at turfgrass cultivations sites were increased as cumulatively in all survey sites. The investigation result indicated that the disease occurrence and pathogens are similar as diseases in golf courses.

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Control Effect on Dollar Spot Disease Caused by Sclerotinia homoeocarpa under Different Application Rates and Intervals with Two Mixed Fungicides

Cited by 3 publications

References 11 publications

Residues Analysis of Acetamiprid, Boscalid, Imidacloprid and Pyraclostrobin in the Minor Crop Mustard Green under Greenhouse Conditions for Evaluation of their Potentiality of PLS Violation

Residues Analysis of Acetamiprid, Boscalid, Imidacloprid and Pyraclostrobin in the Minor Crop Mustard Green under Greenhouse Conditions for Evaluation of their Potentiality of PLS Violation

Evidence for Genetic Similarity of Vegetative Compatibility Groupings in Sclerotinia homoeocarpa

A Detail Investigation of Major Diseases Occurrence and Pathogen Population on Turfgrass Cultivation in Nationwide

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