Sweep-Net Sampling for Western Spotted Cucumber Beetle (Coleoptera: Chrysomelidae) in Snap Beans: Spatial Distribution, Economic Injury Level, and Sequential Sampling Plans

The distribution of adult and larvae Bactrocera oleae (Diptera: Tephritidae), a key pest of olive, was studied in olive orchards. The first objective was to analyze the dispersion of this insect on olive and the second was to develop sampling plans based on fixed levels of precision for estimating B. oleae populations. The Taylor’s power law and Iwao’s patchiness regression models were used to analyze the data. Our results document that Iwao’s patchiness provided a better description between variance and mean density. Taylor’s b and Iwao’s β were both significantly more than 1, indicating that adults and larvae had aggregated spatial distribution. This result was further supported by the calculated common k of 2.17 and 4.76 for adult and larvae, respectively. Iwao’s a for larvae was significantly less than 0, indicating that the basic distribution component of B. oleae is the individual insect. Optimal sample sizes for fixed precision levels of 0.10 and 0.25 were estimated with Iwao’s patchiness coefficients. The optimum sample size for adult and larvae fluctuated throughout the seasons and depended upon the fly density and desired level of precision. For adult, this generally ranged from 2 to 11 and 7 to 15 traps to achieve precision levels of 0.25 and 0.10, respectively. With respect to optimum sample size, the developed fixed-precision sequential sampling plans was suitable for estimating flies density at a precision level of D=0.25. Sampling plans, presented here, should be a tool for research on pest management decisions of B. oleae.

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Economic Injury Levels and Sequential Sampling Plans for Mexican Bean Beetle (Coleoptera: Coccinellidae) on Dry Beans

Journal of Economic Entomology ◽

10.1093/jee/96.4.1160 ◽

2003 ◽

Vol 96 (4) ◽

pp. 1160-1167 ◽

Cited By ~ 3

Author(s):

José A. F. Barrigossi ◽

Gary L. Hein ◽

Leon G. Higley

Keyword(s):

Sequential Sampling ◽

Dry Beans ◽

Mexican Bean Beetle ◽

Sampling Plans ◽

Economic Injury ◽

Bean Beetle

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Economic injury levels and sequential sampling plans forFrankliniella schultzeiin watermelon crops

Pest Management Science ◽

10.1002/ps.4475 ◽

2016 ◽

Vol 73 (7) ◽

pp. 1438-1445 ◽

Cited By ~ 25

Author(s):

Poliana S Pereira ◽

Renato A Sarmento ◽

Tarcísio VS Galdino ◽

Carlos HO Lima ◽

Fábio A dos Santos ◽

...

Keyword(s):

Sequential Sampling ◽

Sampling Plans ◽

Economic Injury

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Spatial distribution and sequential sampling plans for adult Sitona humeralis Stephens (Coleoptera: Curculionidae) in alfalfa

Journal of Asia-Pacific Entomology ◽

10.1016/j.aspen.2014.04.009 ◽

2014 ◽

Vol 17 (3) ◽

pp. 515-519 ◽

Cited By ~ 7

Author(s):

A. Arbab ◽

M.R. McNeill

Keyword(s):

Spatial Distribution ◽

Sequential Sampling ◽

Sampling Plans

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Spatial Distribution of Nymphs of Scaphoideus titanus (Homoptera: Cicadellidae) in Grapes, and Evaluation of Sequential Sampling Plans

Journal of Economic Entomology ◽

10.1093/jee/99.2.578 ◽

2006 ◽

Vol 99 (2) ◽

pp. 578-582 ◽

Cited By ~ 9

Author(s):

Federico Lessio ◽

Alberto Alma

Keyword(s):

Spatial Distribution ◽

Sequential Sampling ◽

Sampling Plans ◽

Scaphoideus Titanus

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

Agronomy ◽

10.3390/agronomy11071434 ◽

2021 ◽

Vol 11 (7) ◽

pp. 1434

Author(s):

Gabriel Díaz-Padilla ◽

J. Isabel López-Arroyo ◽

Rafael A. Guajardo-Panes ◽

Ignacio Sánchez-Cohen

Keyword(s):

Spatial Distribution ◽

Sequential Sampling ◽

Field Evaluation ◽

Production Costs ◽

Ratio Test ◽

Operational Characteristic ◽

Diaphorina Citri ◽

Sample Number ◽

Sampling Plans ◽

Sequential Probability

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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Sequential sampling plan, yield loss components and economic thresholds for the pepper weevil, Anthonomus eugenii Cano (Coleoptera: Curculionidae)

The Journal of Agriculture of the University of Puerto Rico ◽

10.46429/jaupr.v72i3.6866 ◽

1969 ◽

Vol 72 (3) ◽

pp. 375-385

Author(s):

Alejandro E. Segarra-Carmona ◽

Alberto Pantoja

Keyword(s):

Yield Loss ◽

Negative Binomial ◽

Control Strategies ◽

Sequential Sampling ◽

Weekly Schedule ◽

Economic Injury Level ◽

Economic Thresholds ◽

Density Relationship ◽

Economic Injury ◽

Pepper Weevil

A negative binomial distribution best predicted pepper weevil spatial dispersion on pepper plants. Sequential sampling plans for economic threshold (ET) levels of 0.1 and 0.5 adult weevils per plant were developed and tested against a weekly schedule of sprayed and unsprayed check treatments in mini-plots. Weekly sprayed and 0.1 ET mini-plots had similar yield, but higher than 0.5 ET or mini-plots never sprayed. Direct cost to farmers was the same either with 0.1 ET or weekly sprays. However, insecticide applications were reduced by one-third with 0.1 ET. Fruit abortion constituted the main yield-loss component in the pepper weevil-pepper system. An empirical yield-loss vs. adult weevil population density relationship was estimated. This estimate agreed with a theoretical economic injury level of 0.01 adult per plant. Recommendations on the use of prophylactic and responsive control strategies for the pepper weevil are given.

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