Ramularia leaf spot severity and effects on cotton leaf area and yield1

Ascari, João Paulo; Mendes, Inês Roeder Nogueira; Silva, Vanessa Costa da; Araújo, Dejânia Vieira de

doi:10.1590/1983-40632016v4642781

Cited by 4 publications

(4 citation statements)

References 14 publications

(19 reference statements)

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“…On the Ecuadorian coast, the cotton crop is affected by diseases such as damping off (Rhizoctonia solani), cotton anthracnose (Colletotrichum gossypii), and Boll rot (Diplodia gossypina) (Sión et al 1992). Other diseases, like Ramularia leaf spot (Ramulariopsis pseudoglycines), present in neighboring countries (Aquino et al 2008) and not yet reported in Ecuador, can negatively affect the leaf area of cotton plants and fiber yield (Ascari et al 2016;da Silva et al 2019). Despite the importance of these diseases, there is little bibliography about them in Ecuadorian cotton crops.…”

Section: Ramularia Leaf Spot and Boll Rot Are Affected Differently By...mentioning

confidence: 99%

Ramularia leaf spot and boll rot are affected differently by organic and inorganic nitrogen fertilization in cotton plants

Palma-Zambrano

Gavilanes²,

Portalanza³

et al. 2022

Biosci. J.

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Interaction among nitrogen fertilization using bovine manure, poultry manure, Jatropha curcas seed cake and urea, and the diseases Ramularia leaf spot (RLS) and Boll rot (BR), caused by Ramulariopsis pseudoglycines and Diplodia gossypina, respectively, in cotton plants (Gossypium hirsutum L.), was studied under field conditions. Intensity (incidence and severity in percentage) of RLS and incidence (%) of BR were evaluated over time, starting in reproductive stage B1 (first visible flower bud). A randomized complete block design with a 4x4 factorial arrangement was used (fertilizers x doses), totaling 16 treatments with four replications. Disease progress was analyzed with the nonlinear Logistic and Gompertz models, obtaining the epidemiological parameters amount of initial disease (Y0) and progress rate (r). Plants fertilized with 50 kg N ha-1, presented an incidence twice greater than those obtained with other fertilizers. The Logistic model better fits RLS, but no model could represent BR. Only the epidemiological parameters of RLS were affected differently in this experiment compared to BR disease. The possible role of organic and inorganic nitrogen fertilization in the RLS and BR management is discussed.

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Section: Ramularia Leaf Spot and Boll Rot Are Affected Differently By...mentioning

confidence: 99%

Ramularia leaf spot and boll rot are affected differently by organic and inorganic nitrogen fertilization in cotton plants

Palma-Zambrano

Gavilanes²,

Portalanza³

et al. 2022

Biosci. J.

View full text Add to dashboard Cite

show abstract

“…On the Ecuadorian coast, the cotton crop is attacked by diseases such as damping off (Rhizoctonia solani), anthracnose of cotton (Colletotrichum gossypii), and Boll rot (Diplodia gossypina) (Sión et al 1992). Others like Ramularia leaf spot (Ramulariopsis pseudoglycines) present in neighboring countries (Aquino et al 2008) and not yet reported in Ecuador, it can negatively affect the foliar area and ber yield in plants of the genus Gossypium (Ascari et al 2016;da Silva et al 2019). Despite the importance of these diseases in cultivation, I have studied little or nothing.…”

Section: Introductionmentioning

confidence: 99%

Ramularia leaf spot and Boll rot are affected differently by organic and inorganic nitrogen fertilization in cotton plants

Palma-Zambrano

Gavilanes

Portalanza

et al. 2021

Preprint

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Background: In this work, the interaction among nitrogen fertilization using bovine manure, poultry manure, Jatropha curcas seed cake and urea, and the diseases Ramularia leaf spot (RLS) and Boll rot (BR), caused by Ramulariopsis pseudoglycines and Diplodia gossypina, respectively, on cotton plants (Gossypium hirsutum L.), was studied under field conditions. The intensity (incidence and severity in percentage) of RLS and the incidence (%) of BR were evaluated six times, starting in the reproductive stage B1 (first visible flower bud). A randomized complete block experimental design with a 4x4 factorial arrangement (fertilizers x dose), totaling 16 treatments were used. The disease progress was analyzed with the nonlinear Logistic and Gomperts models, obtaining the initial disease's epidemiological parameters (Y0) and progress rate (r). Results: Cotton plants fertilized with 100 kg N ha-1 of J. curcas seed cake and poultry manure with 100 and 200 kg N ha-1 showed an incidence between 16 and 21% of RLS. In contrast, plants fertilized with bovine manure presented the highest incidence of ramularia leaf spot (33%). Regarding factor B (dose), cotton plants fertilized with 50 kg N ha-1, showed a higher percentage of BR incidence, being different from those fertilized with the other doses. In the analysis of the interaction corresponding to the BR incidence, no response pattern was found in the doses for each fertilizer. No correlation was observed between the three health variables analyzed, finding probabilities between 0.002 and 0.892. In the temporal progress of RLS incidence, it was shown that fertilization with J. curcas seedcake and poultry manure was lower than the rest. In severity, the plants were fertilized by J. curcas seedcake concerning the rest. The progression curve of RLS severity temporarily increased similarly, observing that plants fertilized with higher doses reached a lower final proportion of the disease.Regarding the modeling of epidemics using the nonlinear Logistic and Gompertz models, the first model better represented the RLS, except for factor B, where none of the curves was significant. In the Logistic model, a lower amount of initial disease was found (Y0) of RLS, both in incidence (0.259) as in severity (0.081), in plants fertilized with J. curcas seed cake and poultry manure, compared to the rest. For the case of BR incidence, none of the nonlinear models used could be represented.Conclusions: Plants fertilized with 50 kg N ha-1, presented an incidence twice higher than those obtained with other fertilizers. The Logistic model better fits RLS, but no model was adapted to BR. Only the RLS epidemiological parameters were affected differently in this experiment compared to BR disease.

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“…Kühn), anthracnose (Colletotrichum gossypii Southw), boll rot, and ramularia leaf spot (Sión et al, 1992;Palma-Zambrano et al, 2022). Diseases like Ramularia leaf spot can negatively affect cotton plants' leaf area and fiber yield (Ascari et al, 2016). Other diseases identified in cotton crops in other countries such as charcoal rot [Macrophomina phaseolina (Tassi) Goid], bacterial blight [Xanthomonas campestris pv.…”

Section: Introductionmentioning

confidence: 99%

Cercospora leaf spot management with nitrogenous fertilizers in cotton is dependent on the disease amount in the plant canopies

Parrales-Rodríguez,

Zambrano-Gavilanes,

Portalanza

et al. 2024

Sci. agropecu.

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The aim of this study was to examine the impact of both organic and inorganic nitrogen fertilizers on the intensity and epidemiological components of Cercospora leaf spot across three different canopies of cotton plants, specifically the variety DP ACALA 90, under field conditions. Fertilizers used in the study included bovine manure, Jatropha curcas seedcake, poultry manure, and urea (the latter serving as a control). These were applied at 20 days after plant emergence and then during the flowering stage until the total nitrogen (N) dose reached 50, 100, 150, or 200 kg N per hectare. The incidence and severity of the disease were assessed starting at the reproductive stage B1 (the first visible flower bud) across the lower, middle, and upper canopies of four cotton plants, with six evaluations conducted over time. To calculate the initial inoculum (Y0) and the disease progress rate (r), the Exponential, Gompertz, and Logistic models were employed based on temporal data. The study was designed as a randomized complete block with a 4x4 factorial arrangement (fertilizer type x dose), and mean comparisons were made using Tukey's test (p ≤ 0.05). It was found that disease intensity within each canopy level varied in response to the type of nitrogen source and the applied dose, with the severity of the disease (including the area under the disease progress curve) being particularly influenced. A significant interaction between the type of fertilizer and the dose regarding the intensity of Cercospora leaf spot was observed. The Exponential model most accurately depicted the disease's temporal progression. Notably, poultry manure and urea were the fertilizers that most adversely influenced the intensity and initial inoculum (Y0) of Cercospora leaf spot across the various canopies of the cotton plants. The findings suggest that the use of organic fertilizers in cotton cultivation could represent a viable sustainable management strategy.

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Ramularia leaf spot severity and effects on cotton leaf area and yield1

Cited by 4 publications

References 14 publications

Ramularia leaf spot and boll rot are affected differently by organic and inorganic nitrogen fertilization in cotton plants

Ramularia leaf spot and boll rot are affected differently by organic and inorganic nitrogen fertilization in cotton plants

Ramularia leaf spot and Boll rot are affected differently by organic and inorganic nitrogen fertilization in cotton plants

Cercospora leaf spot management with nitrogenous fertilizers in cotton is dependent on the disease amount in the plant canopies

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