A preliminary evaluation of chloro-nicotinyl aphicides as planting-hole treatments against the tobacco aphid Myzus persicae nicotianae

A field trial was done to examine the efficacy of chloro-nicotinyl aphicides applied as soil applications, and to determine the optimum rate for fipronil, acetamiprid and calypso for control of the tobacco aphid Myzus persicae. The tobacco variety KRK26 was used in this experiment. The plants were i...

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Main Author: Matanhire, Rutendo
Language:English
Published: Midlands State University 2014
Subjects:
Online Access:http://hdl.handle.net/11408/324
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author Matanhire, Rutendo
author_facet Matanhire, Rutendo
author_sort Matanhire, Rutendo
collection DSpace
description A field trial was done to examine the efficacy of chloro-nicotinyl aphicides applied as soil applications, and to determine the optimum rate for fipronil, acetamiprid and calypso for control of the tobacco aphid Myzus persicae. The tobacco variety KRK26 was used in this experiment. The plants were initially exposed to natural infestation by the tobacco aphid. At eight weeks after planting (WAP) the plants were artificially infested with cultured aphids after an assessment of natural infestation was done. Assessments were done at weekly intervals up to 11WAP. The aphicides thiamethaxom, imidacloprid 350 SC and fipronil at a rate of 500 ml.Ha-1 exhibited efficacies against the aphids comparable to the two standard aphicides actara and confidor. The aphicide thiamethaxom had the highest residual activity as it was able to effectively control aphids even up to the last assessment week (11 WAP), followed by fipronil and then imidacloprid. This indicates that these three aphicides could potentially be used as soil applications to effectively control M. persicae. In contrast, the rest of the treatments showed little or no efficacy against the tobacco aphid. The suitable application rates for the efficacious chemicals were125 ml.100-1 for thiamethaxom, 170 ml.100L-1 for imidacloprid 350 SC and 500 ml.Ha-1 for fipronil.
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spelling ir-11408-3242022-06-27T13:49:05Z A preliminary evaluation of chloro-nicotinyl aphicides as planting-hole treatments against the tobacco aphid Myzus persicae nicotianae Matanhire, Rutendo Soil applications A field trial was done to examine the efficacy of chloro-nicotinyl aphicides applied as soil applications, and to determine the optimum rate for fipronil, acetamiprid and calypso for control of the tobacco aphid Myzus persicae. The tobacco variety KRK26 was used in this experiment. The plants were initially exposed to natural infestation by the tobacco aphid. At eight weeks after planting (WAP) the plants were artificially infested with cultured aphids after an assessment of natural infestation was done. Assessments were done at weekly intervals up to 11WAP. The aphicides thiamethaxom, imidacloprid 350 SC and fipronil at a rate of 500 ml.Ha-1 exhibited efficacies against the aphids comparable to the two standard aphicides actara and confidor. The aphicide thiamethaxom had the highest residual activity as it was able to effectively control aphids even up to the last assessment week (11 WAP), followed by fipronil and then imidacloprid. This indicates that these three aphicides could potentially be used as soil applications to effectively control M. persicae. In contrast, the rest of the treatments showed little or no efficacy against the tobacco aphid. The suitable application rates for the efficacious chemicals were125 ml.100-1 for thiamethaxom, 170 ml.100L-1 for imidacloprid 350 SC and 500 ml.Ha-1 for fipronil. 2014-08-26T20:04:49Z 2014-08-26T20:04:49Z 2013 http://hdl.handle.net/11408/324 en open Midlands State University
spellingShingle Soil applications
Matanhire, Rutendo
A preliminary evaluation of chloro-nicotinyl aphicides as planting-hole treatments against the tobacco aphid Myzus persicae nicotianae
title A preliminary evaluation of chloro-nicotinyl aphicides as planting-hole treatments against the tobacco aphid Myzus persicae nicotianae
title_full A preliminary evaluation of chloro-nicotinyl aphicides as planting-hole treatments against the tobacco aphid Myzus persicae nicotianae
title_fullStr A preliminary evaluation of chloro-nicotinyl aphicides as planting-hole treatments against the tobacco aphid Myzus persicae nicotianae
title_full_unstemmed A preliminary evaluation of chloro-nicotinyl aphicides as planting-hole treatments against the tobacco aphid Myzus persicae nicotianae
title_short A preliminary evaluation of chloro-nicotinyl aphicides as planting-hole treatments against the tobacco aphid Myzus persicae nicotianae
title_sort preliminary evaluation of chloro-nicotinyl aphicides as planting-hole treatments against the tobacco aphid myzus persicae nicotianae
topic Soil applications
url http://hdl.handle.net/11408/324
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AT matanhirerutendo preliminaryevaluationofchloronicotinylaphicidesasplantingholetreatmentsagainstthetobaccoaphidmyzuspersicaenicotianae