A sequential binomial sampling plan for potato psyllid (Hemiptera: Triozidae) on bell pepper (<i>Capsicum annum</i>
)

Prager, Sean M.; Butler, Casey D.; Trumble, John T.

doi:10.1002/ps.3475

Cited by 12 publications

(7 citation statements)

References 16 publications

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“…Marcelino (2013), which adjusted the negative binomial distribution. Similar results were also reported for another representative of the family Triozidae, Bactericera cockerelli, which is considered a pest of potato, bell pepper, and tomato (Prager et al, 2013(Prager et al, , 2014.…”

Section: Resultssupporting

confidence: 84%

Spatial Distribution of Nymphs of Triozoida limbata Enderlein, 1918 (Hemiptera: Triozidae) in Guava Orchards

Sá¹,

Fernandes²

2015

JAS

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Triozoida limbata is considered one of the leading pests of guava crop in Brazil. Its nymphs are responsible for sucking leaf borders, causing curling and drying of the leaves, and leaving them with a necrotic appearance. Knowledge of the spatial distribution of nymphs of T. limbata is essential for improving sampling and control techniques. The objective of this study was to perform probabilistic analyses of patterns of spatial distribution of nymphs of T. limbata in guava orchards. The study was conducted in four guava orchards in Ivinhema, Mato Grosso do Sul, Brazil. Samplings were performed every 15 days, from April 2012 to March 2014. To obtain the nymph counts, a sampling area was demarcated in each orchard, comprising 50 sampling units. In each unit, a sample was taken randomly from a shoot of 10 cm to 15 cm in length at the median height of the central plant. Dispersion rates were calculated (variance/mean ratio, Morisita index, and Exponent k of Negative Binomial Distribution) and the data obtained in the field were adjusted to the theoretical frequency distributions (Poisson and Negative Binomial). Following the analyses, we concluded that nymphs of T. limbata in the studied populations were randomly organized in the four areas that were evaluated, and the sampling data have been adjusted to the Poisson distribution model.

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Section: Resultssupporting

confidence: 84%

Spatial Distribution of Nymphs of Triozoida limbata Enderlein, 1918 (Hemiptera: Triozidae) in Guava Orchards

Sá¹,

Fernandes²

2015

JAS

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“…Currently, however, successful management of this species centres on the use of systemic neonicotinoids (Grafton-Cardwell et al 2013), which are often soil-applied and also exhibit long periods of protection compared to other materials and to foliar application (Grafton-Cardwell et al 2013;Byrne et al 2017). Similarly, multiple insecticidal materials have been shown to be effective against potato psyllid (Bactericera cockerelli) (Echegaray et al 2017), with soil-applied neonicotinoids proving particularly effective (Prager et al 2013a). In the present study, trunk injection of acephate was examined to control psyllids, and thus tree loss, with limited success.…”

Section: Discussionmentioning

confidence: 99%

Evaluating acephate and azadirachtin for control of Psyllopsis discrepans (Flor) (Hemiptera: Psyllidae) and prevention of decline of ash trees

2022

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Over the past 20 years, ash trees (Oleaceae) in parts of the western United States of America and Canada have been subject to infestations with the psyllid Psyllopsis discrepans (Flor) (Hemiptera: Psyllidae). Infested trees show a series of symptoms, including pseudogalls, canopy loss, and in many cases, tree death. This is an expensive problem for urban forests, particularly in the context of emerald ash borer (Coleoptera: Buprestidae) and Dutch elm disease (Ophiostomataceae), which also impact the diversity of urban forests. This paper presents results from a study on the efficacy of two tree-injected insecticides, Orthene® (acephate) and TreeAzin® (azadirachtin). Trees were treated with these insecticides, and egg and adult psyllids were counted. In addition, canopy cover and severity of pseudogalling were visually assessed. Orthene reduced canopy loss and severity and amount of pseudogalling compared to what occurred on control trees; however, there were more eggs on Orthene-treated trees, indicating that any potential benefit was offset by higher egg counts after treatment. Due to the rapid decline of the ash trees, TreeAzin could not be successfully injected.

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“…For the pattern found in the OC in our study and for the value of the established threshold, it is possible that the established low values of such critical density had determined the indicated results (Figure 4a,b and Table 4); the situation of dealing with a vector of a lethal pathogen in trees obligated to use it. Prager et al [42], in their study concerning the sampling plan for Bactericera cockerelli-peppers-Ca. Liberibacter solanacearum, a pathosystem similar to that of our study with the difference in the cycle of the plants (annual (pepper) vs. perennial (citrus)) indicated the problems related to the management of a pest that at a minimum density, such as the presence of a single infective insect, would be enough to cause disease in plants, as it is the case in many diseases caused by phytopathogen viruses [3].…”

Section: Discussionmentioning

confidence: 99%

“…An initial step in developing a sampling plan is to determine the spatial distribution of the target insect within the field [37,41,42]. For this, there are several indices of spatial dispersion based mainly on the mean-variance relationship.…”

Section: Spatial Distribution Of the Acpmentioning

confidence: 99%

Spatial Distribution and Development of Sequential Sampling Plans for Diaphorina citri Kuwayama (Hemiptera: Liviidae)

Díaz-Padilla

López-Arroyo²,

Guajardo-Panes

et al. 2021

Agronomy

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Vector control in huanglongbing management has been conducted on a calendar basis resulting in high production costs. We addressed this issue and proposed a sequential sampling plan to support decision making for intervention against Diaphorina citri Kuwayama, which is involved in the transmission of the bacteria Candidatus Liberibacter asiaticus, associated with such lethal disease. We analyzed 3,264,660 records from samples gathered from the Mexican trapping program for the monitoring of D. citri; it included weekly inspection of 86,004 yellow sticky traps distributed in the country. Spatial distribution of the insect, estimation of a common k (kc), and sequential sampling plans based on Sequential Probability Ratio Test (SPRT) were determined. Taylor’s power law coefficients were ≥1 indicating aggregation in the spatial distribution of the insect. Common k ranged from 0.0183 to 0.2253 and varied independently of geographic zone or citrus species. We obtained 18 sequential sampling plans, one for each state. In the Average Sample Number (ASN) function, the minimal number of samples to make a decision ranged from 17 to 65. In the Operational Characteristic (OC) function, probabilities for a correct intervention at the threshold of 0.2 D. citri adults/trap in most cases were above 80%. In a field evaluation, the application of sampling plans yielded savings obtained by reduction in the number of interventions for insect control.

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A sequential binomial sampling plan for potato psyllid (Hemiptera: Triozidae) on bell pepper (Capsicum annum )

Abstract: The binomial sequential sampling plan presented here offers an important yet simple tool for managing potato psyllids in bell pepper.

Cited by 12 publications

References 16 publications

Spatial Distribution of Nymphs of Triozoida limbata Enderlein, 1918 (Hemiptera: Triozidae) in Guava Orchards

Spatial Distribution of Nymphs of Triozoida limbata Enderlein, 1918 (Hemiptera: Triozidae) in Guava Orchards

Evaluating acephate and azadirachtin for control of Psyllopsis discrepans (Flor) (Hemiptera: Psyllidae) and prevention of decline of ash trees

Spatial Distribution and Development of Sequential Sampling Plans for Diaphorina citri Kuwayama (Hemiptera: Liviidae)

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