Incidence of corn stunt disease in off-season corn hybrids in different sowing seasons

Costa, R. V. da; Campos, L. J. M.; Almeida, Rodrigo Estevam Munhoz de; Bernardes, Fernanda Pinheiro

doi:10.1590/s1678-3921.pab2019.v54.00872

Cited by 11 publications

(8 citation statements)

References 10 publications

(12 reference statements)

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“…In addition, the search, development, and use of maize hybrids tolerant to corn stunt disease is no less important than efforts against other key pests. [70][71][72][73][74] Accordingly, the visual stunt rating scale developed here may be helpful, like the damage scales used for other key maize pests. 75 Some maize stunt rating scales have been proposed and utilized [76][77][78][79][80] despite lacking clear validation with published empirical data supporting the correlation with corn yield.…”

Section: Discussionmentioning

confidence: 99%

Insecticide seed treatment against corn leafhopper: helping protect grain yield in critical plant growth stages

Neves

Foresti²,

Silva³

et al. 2022

Pest Management Science

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BACKGROUND The corn leafhopper, Dalbulus maidis (Hemiptera: Cicadellidae), spreads maize stunt pathogens and requires timely and effective crop protection. We determined the interaction between maize phenology and the vector feeding/infection period by stunt pathogens with the residual efficacy of neonicotinoid insecticidal seed treatments. Greenhouse‐ and field‐grown maize plants, seed‐treated with clothianidin or imidacloprid insecticides, were infested during seven growth stages with corn leafhoppers reared under controlled conditions on maize plants displaying infection symptoms by both spiroplasma (corn stunt spiroplasma, Spiroplasma kunkelii) and phytoplasma (maize bushy phytoplasma) pathogens. RESULTS In the greenhouse and field settings, seed treatment reduced the stunt disease symptoms and corn yield loss during the VE–V4 maize growth stages and caused no phytotoxicity. The neonicotinoid seed treatment reduced 20–60% of the yield losses from the corn stunt disease until the V4 growth stage. Infestation by infective corn leafhoppers in the V12 maize growth stage caused a 25–30% yield loss irrespective of seed treatment, yet no stunt disease symptom was evident. Nonetheless, corn yield losses and visual stunt symptoms as rated by a nine‐category ordinal scale were strongly correlated (r = 0.79, P < 0.01). CONCLUSION These results reinforce that maize plants are more susceptible to leafhopper stunt disease during the VE–V4 growth stages (emergence to the fourth‐leaf stage). Seed treatment helps reduce the damage in the early growth stages (VE–V2), although supplemental control measures depending on leafhopper population density may be needed from VE–V12 to protect yield losses from the maize stunt condition. © 2021 Society of Chemical Industry.

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Section: Discussionmentioning

confidence: 99%

Insecticide seed treatment against corn leafhopper: helping protect grain yield in critical plant growth stages

Neves

Foresti²,

Silva³

et al. 2022

Pest Management Science

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“…For their management, several cultural strategies have been studied, including planting dates, the elimination of crop residues, treatments to seeds and control of possible vectors, which have displayed a low efficiency in the control of the MBSD, therefore the use of genetically resistant germplasm is accepted as the main alternative to reduce damages and the incidence caused by the phytoplasm, although there are few studies related to the identification of sources of resistance and of genetic control (Costa et al, 2019), which is one of the aims of the present studies.…”

Section: Fully Bilingualmentioning

confidence: 99%

“…Para su manejo, se han estudiado diversas estrategias culturales, incluyendo las fechas de siembra, eliminación de restos de cultivo, tratamientos a semilla y control del vector, las cuales han mostrado baja eficiencia para controlar la enfermedad del enanismo arbustivo, por lo que actualmente se reconoce que el uso de germoplasma resistente es la principal alternativa para reducir los daños y la incidencia causada por el fitoplasma, aunque hay pocos estudios relacionados con la identificación de fuentes de resistencia y de control genético (Costa et al, 2019), uno de los objetivos del presente estudio.…”

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“…Las plantas afectadas por la enfermedad disminuyen su producción de grano en forma significativa. Se deben continuar trabajos de investigación para determinar la etiología de la enfermedad End of the English version information is confirmed in reports by Alcántara-Mendoza et al (2010) and Costa et al (2019) in investigations carried out in tropical areas of Mexico and Brazil, respectively.…”

Section: Fully Bilingualunclassified

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Incidence and effect on grain yield of the “monkey’s hand” disease in 29 maize genotypes

Márquez-Diego¹,

Alba²,

Rojas-Martínez³

et al. 2021

RMF

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Recientemente, se ha observado un incremento en la presencia de una posible nueva enfermedad en plantas de maíz que genera prolificidad de mazorcas que los agricultores denominan “mano de chango”. Estos síntomas se han observado en áreas tropicales, subtropicales y del altiplano de México. Observaciones iniciales, en los años 1960s, indicaron, sin pruebas, que esta enfermedad era causada por hongos, insectos, o deficiencias nutricionales con incidencia de hasta 100% y pérdidas en producción de grano. Este es el primer trabajo en que se evalúa la incidencia de la enfermedad en 21 híbridos comerciales en el Valle de Toluca, México, un híbrido comercial y una variedad nativa de polinización libre en el Valle del Mezquital, Hidalgo, y seis variedades mejoradas de polinización libre en Montecillo, Texcoco, México. La mayor incidencia y pérdidas en rendimiento de grano por la enfermedad se observó en los genotipos Aspros HC8 y la variedad nativa “Hidalgo”, en el Valle del Mezquital, Hidalgo, en donde la presencia de síntomas de la enfermedad mostró una considerable reducción en rendimiento. Es necesario continuar estudios para investigar su etiología y generar información para selección de resistencia genética a esta posible nueva enfermedad.

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“…Besides the damages caused by the normal development of this insect on maize plants, its harmfulness is increased by its ability to carry three relevant plant disease agents: the corn stunt spiroplasma (CSS), maize bushy stunt phytoplasma (MBSP), and maize rayado fino virus (MRFV) (Oliveira et al, 1998;Moya-Raygoza et al, 2007;Pérez-López et al, 2018). These diseases are particularly aggressive on young maize plants, and in Central America, Peru, Brazil, and Argentina their rate of infection ranges between 40 and 100% in many fields (Hruska & Gomez Peralta, 1997;Virla et al, 2003;Da Costa et al, 2019), demonstrating that D. maidis is one of the main issues for maize growers (Jones & Medina, 2020).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a physiologically based model to predict Dalbulus maidis occurrence in maize crops: validation in two different subtropical areas of South America

Rossini

Virla

Albarracin

et al. 2021

Entomologia Exp Applicata

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The maize leafhopper, Dalbulus maidis (DeLong) (Hemiptera: Cicadellidae), is a specialist herbivore that develops on maize plants (Zea mays L., Poaceae). Every year, it is responsible for considerable reductions in yields of the maize fields of the Americas, because alongside its direct damages it is also a vector of three relevant plant pathogens. The transmitted diseases come to have a high incidence, resulting in significant yield losses, thereby forcing farmers and technicians to attempt a tight control of the fields mostly using non-specific insecticides. Decision support systems based on mathematical models may be valuable in helping to reduce the use of agrochemicals in this regard, as they can provide a projection of the future situation based on past and present data. With this precondition, this work aims to apply and validate a physiologically based model to describe populations of D. maidis developing in two experimental fields located in Argentina, which are characterised by different climatic conditions. Experimentation in the two fields involved a 3-year survey during the growing seasons 2009, 2010, and 2011, where the adult populations of maize leafhoppers were monitored from the sowing of maize plants to the end of the phenological stage at which they are most susceptible to D. maidis activity. Results showed a good response of the model in describing maize leafhopper populations, also allowing the possibility of setting a threshold for intervention and a projection of the situation if any control action is applied.

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Incidence of corn stunt disease in off-season corn hybrids in different sowing seasons

Cited by 11 publications

References 10 publications

Insecticide seed treatment against corn leafhopper: helping protect grain yield in critical plant growth stages

Insecticide seed treatment against corn leafhopper: helping protect grain yield in critical plant growth stages

Incidence and effect on grain yield of the “monkey’s hand” disease in 29 maize genotypes

Evaluation of a physiologically based model to predict Dalbulus maidis occurrence in maize crops: validation in two different subtropical areas of South America

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