DEVELOPMENT OF SEQUENTIAL SAMPLING PLANS FOR PINK BOLLWORM IN LONG STAPLE COTTON

Persistent Link:
http://hdl.handle.net/10150/282093
Title:
DEVELOPMENT OF SEQUENTIAL SAMPLING PLANS FOR PINK BOLLWORM IN LONG STAPLE COTTON
Author:
Busacca, John Douglas
Issue Date:
1980
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The sampling dynamics of the pink bollworm (Pectinophora gossypiella (Saunders)) were studied during the cotton growing seasons of 1976, 1977, and 1978. Different sampling methods were employed each year to compare sampling intensity and to compare whole plant samples with susceptible boll samples. Analysis of variance data indicated that significant differences in mean boll infestation levels occurred between small areas of a field (ca. 1 acre), but that these differences were masked when larger units (ca. 10 acres) of a field were used as the sample area. From these data it was found that samples yielded the most accurate pink bollworm infestation estimate when taken from as large an area of the field as possible. Data indicated that accuracy improved only 2 to 3 percent when sample size increased from 60 bolls to 100 bolls. Bolls taken from whole plant samples were as accurate as susceptible boll samples if there was an equal number of bolls in each sample. Sample accuracy was nearly stable for fields 20 to 40 acres in size. A sequential sampling plan for pink bollworm was developed using the binomial distribution. Decision levels were established using the 6 and 12 percent boll infestation levels with α and β levels of 0.2. Approximately 50 percent of the sampling time can be saved over conventional 100 boll samples with very little loss of accuracy for a spray-no spray decision based upon an economic threshold value of 15 percent pink bollworm infestation.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Pink bollworm.; Cotton -- Diseases and pests.; Cotton -- Sampling.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Graduate College; Entomology
Degree Grantor:
University of Arizona
Advisor:
Huber, Roger T.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleDEVELOPMENT OF SEQUENTIAL SAMPLING PLANS FOR PINK BOLLWORM IN LONG STAPLE COTTONen_US
dc.creatorBusacca, John Douglasen_US
dc.contributor.authorBusacca, John Douglasen_US
dc.date.issued1980en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe sampling dynamics of the pink bollworm (Pectinophora gossypiella (Saunders)) were studied during the cotton growing seasons of 1976, 1977, and 1978. Different sampling methods were employed each year to compare sampling intensity and to compare whole plant samples with susceptible boll samples. Analysis of variance data indicated that significant differences in mean boll infestation levels occurred between small areas of a field (ca. 1 acre), but that these differences were masked when larger units (ca. 10 acres) of a field were used as the sample area. From these data it was found that samples yielded the most accurate pink bollworm infestation estimate when taken from as large an area of the field as possible. Data indicated that accuracy improved only 2 to 3 percent when sample size increased from 60 bolls to 100 bolls. Bolls taken from whole plant samples were as accurate as susceptible boll samples if there was an equal number of bolls in each sample. Sample accuracy was nearly stable for fields 20 to 40 acres in size. A sequential sampling plan for pink bollworm was developed using the binomial distribution. Decision levels were established using the 6 and 12 percent boll infestation levels with α and β levels of 0.2. Approximately 50 percent of the sampling time can be saved over conventional 100 boll samples with very little loss of accuracy for a spray-no spray decision based upon an economic threshold value of 15 percent pink bollworm infestation.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectPink bollworm.en_US
dc.subjectCotton -- Diseases and pests.en_US
dc.subjectCotton -- Sampling.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineEntomologyen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorHuber, Roger T.en_US
dc.identifier.proquest8017785en_US
dc.identifier.oclc7712127en_US
dc.identifier.bibrecord.b1349904xen_US
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