Population Dynamics of the Beet Leafhopper (Hemiptera: Cicadellidae) in the Columbia Basin as Influenced by Abiotic Variables

Murphy, Alexzandra F.; Rondon, Silvia I.; Jensen, Andrew S.

doi:10.1603/en12033

Cited by 8 publications

(4 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…They recommended protection of the susceptible, early growth stages in the field. Based on the significant differences in BLH numbers in this study and previous observations (Crosslin et al 2012;Hills 1937;Murphy et al 2012), perhaps the BLH pressure is also consistently higher in the field during these susceptible growth stages. It is possible that the spring generation of BLH is particularly attracted to potatoes, or that preferred host plants are mostly unavailable.…”

Section: Resultssupporting

confidence: 78%

Monitoring and Controlling the Beet Leafhopper Circulifer tenellus in the Columbia Basin

Rondon

Murphy

2016

Am. J. Potato Res.

Self Cite

View full text Add to dashboard Cite

The beet leafhopper (BLH, Circulifer tenellus Baker) is a frequent pest of potatoes in the Columbia Basin of Oregon and Washington. Beet leafhoppers vector the causal agent of potato Purple top disease, known as Beet Leafhopper Transmitted Virescence Agent (BLTVA). Over 70 % of BLH in the region can be infected with BLVTA. Current control methods include making regular insecticide applications beginning in May; however it is unclear if those applications are needed. Thus, are insecticide applications necessary to control BLH and reduce BLTVA through the entire season? To answer that question, a field study was conducted in 2008 and 2009 to assess season-long control of BLH. There were 14 treatments, including the control, that were based on gradually eliminating insecticide applications weekly. Plots were sampled weekly for BLH and surveyed for Purple Top disease. Beet leafhoppers were sampled using sweep nets and an inverted leaf blower. Natural BLH populations were low in 2008 and 2009, but differed significantly among treatments in 2009 for inverted leaf blower and sweep net samples. Yields were assessed at the end of each season and no significant differences were found. Trends in the yield, BLH populations and BLTVA incidence support earlyseason insecticide application when BLH populations are low. The practice of using a calendar spray regime was not supported as yields were similar regardless of insecticide applications. As BLH populations were low, the results emphasized the importance of monitoring before making insecticide applications.Resumen La chicharrita del betabel (BLH, Circulifer tenellus Baker) es una plaga frecuente de las papas en la cuenca del Columbia de Oregón y Washington. Las chicharritas son vectores del agente causal de la enfermedad de la punta morada de la papa, conocida como el agente de la virescencia transmitida por la chicharrita del betabel BLTVA (siglas en inglés). Más del 70 % de BLH en la región pueden estar infectada con BLVTA. Los métodos actuales de control incluyen aplicaciones regulares de insecticidas empezando en Mayo; no obstante, no queda claro si esas aplicaciones son necesarias.De aquí que, ¿son necesarias las aplicaciones de insecticidas para controlar BLH y reducir BLTVA a lo largo de todo el ciclo de cultivo? Para contestar esta pregunta se condujo un estudio en 2008 y 2009 para analizar el control del BLH en todo el ciclo. Fueron 14 tratamientos, incluyendo el testigo, con base en la eliminación gradual de las aplicaciones semanales de insecticida. Se muestrearon los lotes semanalmente para BLH y se observó la enfermedad de la punta morada. Se muestrearon las chicharritas usando redes de barrido y una sopladora invertida de hojas. Las poblaciones naturales de BLH fueron bajas en 2008 y 2009, pero difirieron significativamente en las muestras entre los tratamientos en 2009 para la sopladora invertida de hojas y de las redes de barrido. Se analizaron los rendimientos al final de cada ciclo y no se encontraron diferencias significativas. Las tendencias en el rendim...

show abstract

Section: Resultssupporting

confidence: 78%

Monitoring and Controlling the Beet Leafhopper Circulifer tenellus in the Columbia Basin

Rondon

Murphy

2016

Am. J. Potato Res.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Se han obtenido modelos para estimar el número de insectos a través de la técnica de regresión múltiple, donde las variables independientes han sido algunas características del clima; por ejemplo, la regresión lineal constituye una herramienta para modelar el desarrollo de Plutella xylostella (Lepidoptera: Yponomeutidae), en función de la temperatura (Marchioro y Foerster, 2011). El modelo ajustado con información de tres años, determinó que la distribución espacial de Circulifer tenellus (Hemiptera: Cicadellidae) depende de la temperatura media, la precipitación y la velocidad del viento (Murphy et al, 2012). En otro modelo obtenido con la misma técnica y con datos de un año, se concluyó que la temperatura y la precipitación explican el 89% de la variación en el número de individuos de Dendroctonus mexicanus (Coleoptera: Scolytidae) (Villa y Villa, 1996).…”

Section: Introductionunclassified

Curva de crecimiento poblacional de Spodoptera frugiperda en maíz en Irapuato, Guanajuato, México

2018

View full text Add to dashboard Cite

The fall armyworm Spodoptera frugiperda Smith (Lepidoptera: Noctuidae) is an important pest of maize (Zea mays L.) in Irapuato, Guanajuato, Mexico. The objective of the study was to obtain the population growth curve (and its estimation) of the adults of S. frugiperda in the maize crop in Irapuato, Guanajuato, Mexico. Applying the multiple regression technique, the functional form of a third-degree polynomial was obtained, in terms of temperature and precipitation, using the monthly averages available from 1993 to 2002. The estimated equation was: Y = 821.347 – 104.728T + 2.737P + 3.448T2 – 0.019P2 – 0.180TP + 0.001TP2 (1), where T was the average monthly mean temperature, P was the average monthly accumulated precipitation, and Y was the average of adults of S. frugiperda per month. In addition, using standard mathematical programming techniques, the critical temperature and the critical precipitation were calculated (T=13.70 °C, P=38.70 mm) obtaining the average of maximum number of individuals of this specie per month, which was 39 adults. The prediction model (1) provided information to reach deep understanding of the fluctuation of this species population, and contributed, therefore, to make the integrated pest management in maize crop more efficient, in the region of “El Bajío” of Guanajuato.

show abstract

“…Se han construido modelos utilizando la técnica de la regresión con el fin de estimar poblaciones insectiles de varias especies, cuyos predictores son precisamente variables climáticas (Murphy et al, 2012;Cuéllar et al, 2012). Particularmente en pulgones de la especie Macrosiphum euphorbiae en el cultivo de lechuga, Morales y Fereres (2008), obtuvieron el modelo definido por: Y= -1.56 -3.51 T -0.77 T 2 + 0.02 T 3 , para aproximar el número de individuos en términos de la temperatura, a través de regresión no lineal simple, donde Y representó el número de pulgones y T la temperatura media en °C, con un valor de coeficiente de determinación R 2 = 0.892.…”

Section: Introductionunclassified

“…Models have been constructed using the technique of regression to estimate insect populations of various species, which are precisely predictors climate variables (Murphy et al, 2012;Cuéllar et al, 2012). Particularly aphids of the species Macrosiphum euphorbiae in growing lettuce, Morales and Fereres (2008), won the model defined by Y= -1.56 -3.51 T -0.77 T 2 + 0.02 T 3 , to approximate the number of individuals in terms of the temperature through simple nonlinear regression, where Y represents the number of aphids and average temperature T in °C, a coefficient value determination R 2 = 0.892.…”

Section: Introductionmentioning

confidence: 99%

Relación del número de individuos de Brevicoryne brassicae con la temperatura y con su parasitoide Diaretiella rapae en brócoli en el Bajío, México

Salas-Araiza

González-Márquez

Martínez-Jaime

2017

Remexca

View full text Add to dashboard Cite

show abstract

Population Dynamics of the Beet Leafhopper (Hemiptera: Cicadellidae) in the Columbia Basin as Influenced by Abiotic Variables

Cited by 8 publications

References 15 publications

Monitoring and Controlling the Beet Leafhopper Circulifer tenellus in the Columbia Basin

Monitoring and Controlling the Beet Leafhopper Circulifer tenellus in the Columbia Basin

Curva de crecimiento poblacional de Spodoptera frugiperda en maíz en Irapuato, Guanajuato, México

Relación del número de individuos de Brevicoryne brassicae con la temperatura y con su parasitoide Diaretiella rapae en brócoli en el Bajío, México

Contact Info

Product

Resources

About