Plant Health Progress最新文献_第10页

Effects of nitrogen application rate and plant density on severity of tar spot of corn 施氮量和密度对玉米焦油斑严重程度的影响

IF 2.3

Plant Health Progress Pub Date : 2023-04-11 DOI: 10.1094/php-12-22-0125-rs

Jill C. Check, A. Byrne, M. Singh, K. Steinke, William W. Widdicombe, M. Chilvers

{"title":"Effects of nitrogen application rate and plant density on severity of tar spot of corn","authors":"Jill C. Check, A. Byrne, M. Singh, K. Steinke, William W. Widdicombe, M. Chilvers","doi":"10.1094/php-12-22-0125-rs","DOIUrl":"https://doi.org/10.1094/php-12-22-0125-rs","url":null,"abstract":"Tar spot of corn, caused by the fungus Phyllachora maydis, is an economically important foliar disease recently reported in the U.S and Canada. Due to the recent introduction of Phyllachora maydis, the impacts of cultural management practices on disease development are still unknown. Separate field studies were conducted to determine effects of nitrogen (N) application rate and plant density on disease development. Field trials were conducted across six site years in Michigan with two corn hybrids of differing disease susceptibility. Relative area under the disease progress curve (rAUDPC) was used to compare disease development between N application rates and plant densities. Nitrogen application rate had no significant effect on disease at any location. Plant density and disease had a significant (P < 0.05) inverse relationship at five of six site years, with an average 41% decrease in rAUDPC for every 1000 plant per hectare increase. The economically optimal planting density ranged from 73 to 77 thousand plants per hectare for $150 to $300 USD per metric ton corn prices, demonstrating relatively low planting densities were more profitable despite greater disease. Therefore, other disease management practices including hybrid selection may be more effective at protecting yield than increasing plant density.","PeriodicalId":20251,"journal":{"name":"Plant Health Progress","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48583684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Congruent and Differential Responses of Pseudoperonospora cubensis Clades 1 and 2 to Downy Mildew Fungicides 立方假丝孢1和2分支对霜霉病菌的同源性和差异性反应

IF 2.3

Plant Health Progress Pub Date : 2023-04-05 DOI: 10.1094/php-01-23-0007-sc

A. Keinath

{"title":"Congruent and Differential Responses of Pseudoperonospora cubensis Clades 1 and 2 to Downy Mildew Fungicides","authors":"A. Keinath","doi":"10.1094/php-01-23-0007-sc","DOIUrl":"https://doi.org/10.1094/php-01-23-0007-sc","url":null,"abstract":"Fungicides are the most common and important management technique for cucurbit downy mildew. Fungicide efficacy against the causal agent, Pseudoperonospora cubensis, an obligate biotroph, has been monitored on potted cucumber seedlings exposed to natural inoculum. The objective of this study was to compare efficacy of nine fungicides on cucumber (Cucumis sativus) against Clade 2 of P. cubensis with their efficacy on butternut squash (Cucurbita moschata) and watermelon (Citrullus lanatus), hosts primarily infected by Clade 1. Bioassays were done in Charleston, SC, USA, with all three hosts in October 2019 and 2020 and with butternut squash in July 2018. Lack of efficacy, determined as relative disease severity not significantly different from the water control, typically ≥ 50%, was detected with cymoxanil (Curzate), azoxystrobin (Quadris), dimethomorph (Forum), mandipropamid (Revus), or propamocarb (Previcur Flex) more frequently in Clade 2 isolates (7 of 18 times) than in Clade 1 isolates (12 of 43 times). Cymoxanil, azoxystrobin, and dimethomorph were ineffective in over half of the bioassays on all hosts. Mandipropamid was ineffective only against Clade 2 in both cucumber assays, while propamocarb was ineffective only against Clade 1 in two of three and one of two bioassays on butternut squash and watermelon, respectively. In all seven bioassays ethaboxam (Elumin) was effective to moderately effective, and cyazofamid (Ranman), fluazinam (Omega), and fluopicolide (Presidio) were effective.","PeriodicalId":20251,"journal":{"name":"Plant Health Progress","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41887970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sources of resistance, effect of maturity groups and marker-trait associations associated with Fusarium graminearum causing root rot of soybean (Glycine max) 禾谷镰刀菌引起大豆根腐病的抗性来源、成熟组效应和标记性状关联

IF 2.3

Plant Health Progress Pub Date : 2023-04-05 DOI: 10.1094/php-01-23-0011-rs

{"title":"Sources of resistance, effect of maturity groups and marker-trait associations associated with Fusarium graminearum causing root rot of soybean (Glycine max)","authors":"","doi":"10.1094/php-01-23-0011-rs","DOIUrl":"https://doi.org/10.1094/php-01-23-0011-rs","url":null,"abstract":"Fusarium graminearum Schwabe is an important fungus causing root rot of soybean (Glycine max L.) in the United States. In this study, 248 accessions (including the susceptible check, ‘Williams 82’) from the USDA germplasm collection (MG 0 to V) were screened with a single isolate of F. graminearum using the inoculum layer inoculation method in the greenhouse to identify resistant parental materials. Disease severity was evaluated 21 days post-inoculation on a 1-to-5 rating scale and expressed as relative treatment effects (RTE). Eight accessions (PI437949, PI438292, PI612761A, PI438094B, PI567301B, PI408309, PI361090, and P188788) had significantly lower RTE when compared to ‘Williams 82’ based on 95% confidence intervals. Further, the effect of maturity groups (MG) was assessed on disease severity, and accessions belonging to MG 0 or I had significantly greater RTE than cultivars belonging to MGs II to V based on 95% confidence intervals. A genome-wide association study analysis was conducted using 42,079 single nucleotide markers and six marker-trait associations were identified that may be novel sources of F. graminearum resistance. The identification of new resistant parental materials and MTAs associated with resistance to F. graminearum will be useful in breeding programs for developing resistant cultivars.","PeriodicalId":20251,"journal":{"name":"Plant Health Progress","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43784365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rust disease caused by Uredinopsis osmundae on balsam fir, Canaan fir, white fir, and sensitive fern reported from Pennsylvania, USA 美国宾西法尼亚州香冷杉、南冷杉、白杉和敏感蕨类植物的锈病报道

IF 2.3

Plant Health Progress Pub Date : 2023-03-29 DOI: 10.1094/php-11-22-0115-br

Paula Andrea Gómez-Zapata, D. Davis, C. Aimé

引用次数: 0

Building Health into New Boxwood Crops and Plantings by Making Informed Cultivar Selection 通过明智的品种选择来培育黄杨新作物和种植

IF 2.3

Plant Health Progress Pub Date : 2023-03-23 DOI: 10.1094/php-01-23-0002-rv

Chuang Hong

引用次数: 0

Comparison of Proanthocyanidin and Phenolic Rich Extracts Derived from Pecan Shell and Husk as Elicitors of Induced Resistance against Phytophthora capsici on Chile Pepper 原花青素与富酚类山核桃壳提取物对辣椒疫霉诱导抗性的比较

IF 2.3

Plant Health Progress Pub Date : 2023-03-23 DOI: 10.1094/php-12-22-0123-rs

P. Lujan, S. Dura, Ivette Guzmán, R. Steiner, S. Sanogo

{"title":"Comparison of Proanthocyanidin and Phenolic Rich Extracts Derived from Pecan Shell and Husk as Elicitors of Induced Resistance against Phytophthora capsici on Chile Pepper","authors":"P. Lujan, S. Dura, Ivette Guzmán, R. Steiner, S. Sanogo","doi":"10.1094/php-12-22-0123-rs","DOIUrl":"https://doi.org/10.1094/php-12-22-0123-rs","url":null,"abstract":"The use of plant-derived secondary metabolites to induce disease resistance in plants has been well documented. In this study, total phenolics and total proanthocyanidins (PAC) were extracted from shell and husk of pecan (Carya illinoinensis) and quantified. Under greenhouse conditions, the extracts were foliarly applied to chile pepper (Capsicum annuum, cultivar NM 6-4) to compare their ability to induce resistance in plants inoculated with a virulent isolate of Phytophthora capsici. Extractions yielded total phenolic contents of 673 ± 28 mg/g and 293 ± 24 mg/g dry weight (DW) for shell and husk and total PAC contents of 1770.10 ± 158.62 mg/g DW and 901.30 ± 22.84 mg/g DW for shell and husk, respectively. Chile plants treated with total phenolic and PAC extracts from pecan husk or shell or 0.1% salicylic acid, a plant defense hormone, remained asymptomatic throughout the study for three weeks, while plants treated with water, which served as a control, died. Both total phenolic and total PAC extracts derived from pecan byproducts can be used within a greenhouse setting as elicitors to induce resistance response in chile pepper against plant pathogens such as P. capsici.","PeriodicalId":20251,"journal":{"name":"Plant Health Progress","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42037382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluation of a proprietary plant extract to suppress bacterial canker and improve yield in hydroponic tomatoes 一种专有植物提取物抑制水培番茄细菌溃疡并提高产量的评价

IF 2.3

Plant Health Progress Pub Date : 2023-03-22 DOI: 10.1094/php-10-22-0112-rs

F. Rotondo, Nitika Khatri, A. Testen, S. Miller

{"title":"Evaluation of a proprietary plant extract to suppress bacterial canker and improve yield in hydroponic tomatoes","authors":"F. Rotondo, Nitika Khatri, A. Testen, S. Miller","doi":"10.1094/php-10-22-0112-rs","DOIUrl":"https://doi.org/10.1094/php-10-22-0112-rs","url":null,"abstract":"Bacterial canker of tomato, caused by the systemic bacterial phytopathogen Clavibacter michiganensis, can result in significant economic losses in hydroponic tomato production systems. Lacking effective bactericides, the disease is managed primarily by clean seed procedures, sanitation and quarantine. Plant extracts have been shown to display antimicrobial activity and/or induce plant resistance to disease. We tested the efficacy of AOMMA-Agro, an Organic Materials Review Institute (OMRI)-listed proprietary blend of plant extracts, in suppressing bacterial canker and improving yield and shelf life in hydroponic tomato trials over two years. Experiments were conducted in a greenhouse with ‘Campari’ tomatoes transplanted into coconut coir blocks and grown under hydroponic conditions. Plants were trellised, pruned and harvested according to commercial standards. AOMMA-Agro was applied weekly or biweekly as a foliar spray and inoculated with C. michiganensis. Plants treated with water and inoculated or not inoculated served as controls. Disease severity was relatively low in both years, however disease progress was significantly lower for plants inoculated and treated bi-weekly, but not weekly, with AOMMA-Agro than non-treated, non-inoculated plants in one of two trials. Similar results were observed in C. michiganensis incidence determined using qPCR. Marketable yield was 29% and 44% higher from inoculated plants treated bi-weekly with AOMMA-Agro than from non-treated, non-inoculated plants in the two experiments. These results support the use of AOMMA-Agro as a potential option for bacterial canker management and yield enhancement in hydroponic tomato greenhouse production systems.","PeriodicalId":20251,"journal":{"name":"Plant Health Progress","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42483380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Green yield as a potential predictor of cured burley tobacco yield in a Phytophthora nicotianae-infested field over four seasons 在疫霉侵染地，绿色产量作为一年四季烤烟产量的潜在预测因子

IF 2.3

Plant Health Progress Pub Date : 2023-03-21 DOI: 10.1094/php-09-22-0085-rs

E. Pfeufer, William B. Barlow, Bob Pearce

{"title":"Green yield as a potential predictor of cured burley tobacco yield in a Phytophthora nicotianae-infested field over four seasons","authors":"E. Pfeufer, William B. Barlow, Bob Pearce","doi":"10.1094/php-09-22-0085-rs","DOIUrl":"https://doi.org/10.1094/php-09-22-0085-rs","url":null,"abstract":"Phytophthora-induced plant diseases are most effectively managed using an integrated strategy that includes host resistance, best cultural practices, and fungicide applications. Black shank, caused by Phytophthora nicotianae, is the most significant soilborne disease affecting tobacco, and extensive breeding for resistance has resulted in an array of varieties with a spectrum of black shank resistance. Estimates of plant survival are the most common measurement in tobacco black shank trials, however, survival may not be the most accurate indicator of yield for varieties with robust resistance. Through the presented analyses, at-harvest green yield estimates are shown to be more closely associated with cured tobacco yields than survival counts, irrespective of black shank resistance status. However, green yield may only be considered a standalone yield predictor for low resistance varieties, with other factors likely contributing to cured yield of moderate and high resistance varieties. This prevents development of a unified (variety-nonspecific) cured yield model, which would be useful not only for tobacco scientists, but also commercial growers in planning labor activities and the industry at-large in managing cured tobacco inventory. More broadly, this suggests that research in other Phytophthora pathosystems may benefit from yield estimates in addition to survival counts in resistant variety evaluations.","PeriodicalId":20251,"journal":{"name":"Plant Health Progress","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46673967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biological control efficacy of Bacillus sp. REB711 on sheath blight of rice 芽孢杆菌REB711对水稻纹叶枯病的生物防治效果

IF 2.3

Plant Health Progress Pub Date : 2023-03-14 DOI: 10.1094/php-10-22-0097-rs

Ateet Maharjan, Jobelle Bruno, S. Osti, I. Barphagha, J. Ham

{"title":"Biological control efficacy of Bacillus sp. REB711 on sheath blight of rice","authors":"Ateet Maharjan, Jobelle Bruno, S. Osti, I. Barphagha, J. Ham","doi":"10.1094/php-10-22-0097-rs","DOIUrl":"https://doi.org/10.1094/php-10-22-0097-rs","url":null,"abstract":"Sheath blight (ShB), caused by Rhizoctonia solani, is one of the economically important rice diseases in Louisiana and other rice-growing regions. Fungicides are used to manage ShB but such chemical methods are not economically or ecologically sustainable. To develop new biological control agents for the management of ShB, bacteria isolated from rice plants in the field were initially screened in the laboratory based on their antagonistic activities against R. solani through plate assays that exhibit growth inhibition of the fungal pathogen. Efficacy of three selected strains of Bacillus spp. (RAB14R, REB711, and RRB985) in suppression of ShB was further evaluated under the greenhouse and field conditions. In field trials conducted in 2017 and 2018, foliar spray of Bacillus sp. REB711 significantly reduced the development of ShB compared to the non-treated control, although it was less effective than the azoxystrobin fungicide Quadris®. In greenhouse tests, Bacillus sp. REB711 significantly reduced ShB development (disease severity and lesion length) through seed treatment, while the other two strains of Bacillus spp. did not. The observed efficacy of Bacillus sp. REB711 could result from competition, antibiosis, and/or induction of plant defense system, and suggests that this bacterial strain could be used a potential biological agent for managing ShB by itself or in combination with fungicides to reduce the risk of fungicide resistance.","PeriodicalId":20251,"journal":{"name":"Plant Health Progress","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48328771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pathogenicity of Rice Blast (Pyricularia oryzae) Isolates from the Ryukyu Archipelago, Okinawa, in Southern Japan 日本冲绳琉球列岛稻瘟病分离株的致病性

IF 2.3

Plant Health Progress Pub Date : 2023-03-07 DOI: 10.1094/php-07-22-0063-rs

A. Ajitomi, Mohanmad Ashik Iqbal Khan, Thi Nhai Nguyen, Thi Oanh Nguyen, Y. Fukuta

{"title":"Pathogenicity of Rice Blast (Pyricularia oryzae) Isolates from the Ryukyu Archipelago, Okinawa, in Southern Japan","authors":"A. Ajitomi, Mohanmad Ashik Iqbal Khan, Thi Nhai Nguyen, Thi Oanh Nguyen, Y. Fukuta","doi":"10.1094/php-07-22-0063-rs","DOIUrl":"https://doi.org/10.1094/php-07-22-0063-rs","url":null,"abstract":"Rice ( Oryza sativa L.) is a major crop, and blast ( Pyricularia oryzae Cavara) has been the most serious disease in Japan. Ninety-seven rice blast isolates were collected from the Ryukyu Archipelago, including Okinawa Main Island (OK) and Yaeyama Islands (YA), in Japan's southern region. The pathogenicities of blast isolates were clarified by an inoculation test based on the resistance reaction patterns to differential varieties (DVs) and a susceptible control, Lijiangxintuanheigu (LTH). Virulent isolates occurred with high frequencies to LTH and DVs for Pish, Pia, Pii, Pi3, Pik-s, and Pi19(t). The DVs for Pib, Pik-m, Pi1, Pik-h, Pik, Pik-p, Pi7(t), Pi9(t), Piz, Piz-5, Piz-t, Pita-2 (two lines), Pil2(t), and Pi20(t) had low frequencies, and those for Pit, Pi5(t), and Pita (two lines) had intermediate frequencies. These isolates were classified into two groups (I and II) based on the reaction patterns to DVs by cluster analysis. The virulence of the blast isolates from cluster II against DVs for Pit, Pi5(t), Pita (two lines), and Pi20(t) was much greater than that of those in cluster I. Cluster I blast isolates were distributed dominantly in OK, and those of cluster II were in YA. This is the first report on the distribution of blast races in the Ryukyu Archipelago in Japan. This information will be useful for developing sustainable protection systems and rice breeding against blast disease.","PeriodicalId":20251,"journal":{"name":"Plant Health Progress","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44346208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0