Septoria Leaf Blotch and Yellow Rust Control By: Fungicide Application Opportunity and Genetic Response of Bread Wheat Varieties

Gomes, Conceição; Costa, Rita; Almeida, Ana Sofia; Coutinho, José Moacyr Vianna; Pinheiro, Nuno; Coco, J.; Costa, A. M. M.; Maçãs, Benvindo

doi:10.9755/ejfa.2016-04-345

Cited by 9 publications

(8 citation statements)

References 12 publications

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“…These cultivars may have had less disease developing and hence yield loss prevented by fungicide application was limited. These findings are in agreements with Gomes et al (2016) findings where they reported that resistant cultivars did not benefit from fungicide application. De Wolf et al (2012) and Thompson et al (2014) also reported similar findings where susceptible cultivars had a larger response to fungicides than resistant cultivars.…”

Section: Discussionsupporting

confidence: 93%

Winter Wheat Grain Yield Response to Fungicide Application is Influenced by Cultivar and Rainfall

et al. 2019

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Section: Discussionsupporting

confidence: 93%

Winter Wheat Grain Yield Response to Fungicide Application is Influenced by Cultivar and Rainfall

et al. 2019

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“…The development of leaf blotches mainly depends on meteorological conditions (El Jarroudi et al, 2022;Kuzdraliński et al, 2015;Willocquet et al, 2021). Optimal temperatures for the germination of the conidia of Z. tritici are between +15 °C and +25 °C (Boixel et al, 2022;Gomes et al, 2016), but for conidia of P. tritici-repentis -between +20 °C and +25 °C (Bouras, Kim, & Strelkov, 2009). The development of the leaf blotches is facilitated by a high level of humidity in the canopy (Boixel et al, 2022;Bouras, Kim, & Strelkov, 2009;Gomes et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Optimal temperatures for the germination of the conidia of Z. tritici are between +15 °C and +25 °C (Boixel et al, 2022;Gomes et al, 2016), but for conidia of P. tritici-repentis -between +20 °C and +25 °C (Bouras, Kim, & Strelkov, 2009). The development of the leaf blotches is facilitated by a high level of humidity in the canopy (Boixel et al, 2022;Bouras, Kim, & Strelkov, 2009;Gomes et al, 2016). Increasing leaf moisture promotes spore germination and decreases the time for Z. tritici penetration into leaf tissues (Fones & Gurr, 2015).…”

Section: Introductionmentioning

confidence: 99%

Impact of Fungicide Treatment Schemes on the Severity of Leaf Blotches in Winter Wheat

Švarta,

Bimšteine,

Bankina

et al. 2023

Rural Sustainability Research

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The common control method of leaf blotches is the application of fungicides; however, the results of trials are inconsistent. The aim of the present study was to evaluate the impact of the fungicide treatment intensity on the severity of leaf blotches and to assess the correlation between the development of diseases and winter wheat (Triticum aestivum) yield in 2018–2021. The development of diseases was evaluated regularly. In this study, the severity of leaf blotches at the medium milk ripening (GS 75–77) was used. Tan spot dominated in 2018, 2019, and 2021, but Septoria tritici blotch dominated in 2020. Fungicides significantly decreased the severity of tan spot and Septoria tritici blotch, but the efficacy of used fungicide treatment schemes differed during trial years – it was more pronounced under higher pressures of leaf blotches. In the year with a high severity of Septoria tritici blotch, the best efficacy was obtained when fungicide was used two times (at GS 32–33 and GS 55–59), but for tan spot – when the dose of fungicide was done in two or three applications. Usage of fungicides increased wheat yield only under high pressure of diseases. A strong significant correlation between the severity of Septoria tritici blotch at GS 75–77 and grain yields was established only in 2020, when the severity of the disease was higher.

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“…Konīdiju izplatīšanās un dīgšana ir atkarīga no ūdens pieejamības un nokrišņiem (Wiik, Ewaldz, 2009). Minimālā temperatūra patogēna attīstībai ir +8 ºC, maksimālās no +15 ºC.... + 25 ºC, relatīvais gaisa mitrums virs 80% un pēc iespējas garāks periods, kurā augiem ir mitras lapas (Gomes et al, 2016). Lauka apstākļos patogēna attīstības latentais periods ilgst apmēram 14 dienas, vēsākā laikā -līdz pat 28 dienām (Fones, Gurr, 2015;Suffert, Thompson, 2018), bet citos literatūras avotos minēts, ka periods var ilgt līdz pat 36 dienām (Steinberg, 2015).…”

Section: Kviešu Lapu Pelēkplankumainībaunclassified

“…Ziemas kviešiem inficējas visas auga virszemes daļas: lapas, stiebri un vārpas. Inficēšanās var notikt visu auga attīstības laiku, sākot no vienas lapas fāzes līdz pat nogatavošanās brīdim, ja vēl palikusi zaļa virsma (Gomes et al, 2016).…”

Section: Dzeltenā Un Brūnā Rūsaunclassified

The influence of winter wheat leaf diseases on yield and yield components = Ziemas kviešu lapu slimību ietekme uz ražu un tās struktūrelementiem

Svarta

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The field trials was conducted at Training and Research Farm “Pēterlauki” of Latvia University of Life Sciences and technologies in four seasons from 2017/2018 till 2020/2021. The research was supported by the EIP–AGRI project “The development of the decision-making support system for restriction of the diseases, affecting leaves and ears of winter wheat” and by the European Social Fund within the project 522 (No. 8.2.2.0/20/I/001) “LLU Transition to a new funding model of doctoral studies” Hypothesis of the thesis: The harmfulness of winter wheat leaf diseases depends on the severity of disease during the vegetation period and the meteorological conditions of the year. The aim of the thesis To determine the impact of the winter wheat leaf diseases on the yield and yield-forming components, depending on the agro-ecological conditions. Research tasks 1. To describe the peculiarities of development of winter wheat leaf diseases depending on meteorological conditions. 2. To analyze the development of winter wheat leaf diseases depending on intensity of fungicide treatment. 3. To analyze the yield and the yield-forming components of winter wheat depending on intensity of fungicide treatment. 4. To analyze the influence of nitrogen on the development of winter wheat leaf diseases, the yield and the yield-forming components. The structure of the research paper: Chapter 1 – The literature review includes four subchapters. The chapter includes the characteristics of the most common leaf diseases of winter wheat, describes the effect of agrotechnical measures, the effect of leaf diseases on yield and yield-forming components and chemical control of leaf diseases. Chapter 2 – Materials and methods includes five subchapters. The chapter describes the methodology of field trial, field observations and analysis, the meteorological conditions at the site as well as the mathematical data processing methods used. Chapter 3 – The results and discussion includes four subchapters. The chapter analyzes the dinamics of development of leaf blotches at different plant growth stages, the total disease impact (AUDPC) during vegetation period, the efficiency of fungicide treatment schemes at different rates of top-dressing nitrogen fertilisation. The impact of fungicide treatment schemes on the grain yield and yield-forming components, as well as the interaction between the severity of leaf blotches and formation of yield were eveluated. The conclusions include answers to the research tasks. The paper contains 14 tables, 18 figures, 24 annexes, 217 scientific source references, 11 footnotes. Zinātniskā darba izstrādāšanai lauka izmēģinājumi veikti Latvijas Biozinātņu un tehnoloģiju universitātes (iepriekš Latvijas Lauksaimniecības universitāte) Lauksaimniecības fakultātes Mācību un pētījumu saimniecībā “Pēterlauki”, izmēģinājuma periods četras ražas sezonas: 2016./2017. – 2019./2020. gads. Pētījums veikts ar EIP-AGRI projekta “Lēmuma pieņemšanas atbalsta sistēmas izstrāde ziemas kviešu lapu un vārpu slimību ierobežošanai” un ESF projekta Nr. 8.2.2.0/20/I/001 “LLU pāreja uz jauno doktorantūras finansēšanas modeli” atbalstu. Darba hipotēze: Ziemas kviešu lapu slimību postīgums ir atkarīgs no slimību attīstības pakāpes veģetācijas periodā un gada meteoroloģiskajiem apstākļiem. Promocijas darba mērķis Noskaidrot ziemas kviešu lapu slimību ietekmi uz ražu un tās struktūrelementiem atkarībā no agroekoloģiskajiem apstākļiem. Pētījuma uzdevumi 1. Raksturot ziemas kviešu lapu slimību attīstības īpatnības atkarībā no meteoroloģiskajiem apstākļiem. 2. Analizēt lapu slimību attīstību atkarībā no fungicīdu lietošanas intensitātes. 3. Analizēt ziemas kviešu ražu un tās struktūrelementus atkarībā no fungicīdu lietošanas intensitātes. 4. Analizēt slāpekļa ietekmi uz lapu slimību attīstību, kviešu ražu un tās struktūrelementiem. Promocijas darba strukturējums: 1. nodaļa – Literatūras apskats ietver četras apakšnodaļas. Nodaļā ietilpst izplatītāko ziemas kviešu lapu slimību raksturojums, aprakstīta agrotehnisko pasākumu ietekme, lapu slimību ietekme uz ražas veidošanos un lapu slimību ķīmiskā ierobežošana. 2. nodaļa – Materiāli un metodes ietver piecas apakšnodaļas. Nodaļā aprakstīta lauka izmēģinājumu ierīkošanas metodika, veiktās uzskaites, raksturoti meteoroloģiskie apstākļi izmēģinājumu vietā, kā arī izmantotās datu matemātiskās apstrādes metodes. 3. nodaļa – Izmēģinājuma rezultāti un diskusija ietver četras apakšnodaļas. Tajās analizēta lapu plankumainību attīstības dinamika, kopējā lapu plankumainību attīstība (AUDPC), fungicīdu lietošanas shēmu efektivitāte lapu plankumainību ierobežošanā pie dažādām slāpekļa papildmēslojuma normām, izvērtēta fungicīdu lietošanas shēmu ietekme uz kviešu ražas struktūrelementu veidošanos un graudu ražu, vērtētas sakarības starp lapu plankumainību attīstības pakāpi un ražas veidošanos. Secinājumos dotas atbildes uz izvirzītajiem pētījuma uzdevumiem. Darbā ietvertas 14 tabulas, 18 attēli, 24 pielikumi, izmantoti 217 literatūras avoti, 11 atsauces parindenī.

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Septoria Leaf Blotch and Yellow Rust Control By: Fungicide Application Opportunity and Genetic Response of Bread Wheat Varieties

Cited by 9 publications

References 12 publications

Winter Wheat Grain Yield Response to Fungicide Application is Influenced by Cultivar and Rainfall

Winter Wheat Grain Yield Response to Fungicide Application is Influenced by Cultivar and Rainfall

Impact of Fungicide Treatment Schemes on the Severity of Leaf Blotches in Winter Wheat

The influence of winter wheat leaf diseases on yield and yield components = Ziemas kviešu lapu slimību ietekme uz ražu un tās struktūrelementiem

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