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- Title
Analysis of oilseed rape stem weevil chemical control using a damage rating scale.
- Authors
Milovac, Željko; Zorić, Miroslav; Franeta, Filip; Terzić, Sreten; Petrović Obradović, Olivera; Marjanović Jeromela, Ana
- Abstract
BACKGROUND Rape stem weevil ( Ceutorhynchus napi Gyll.) and cabbage stem weevil ( C. pallidactylus Marsh.) can cause significant yield losses to oilseed rape ( Brassica napus L .), and chemical control is often needed to protect crops from these pests. The efficacy of six insecticides, chlorpyriphos + cypermethrin, bifenthrin, alpha-cypermethrin, pirimiphos-methyl, thiacloprid and tau-fluvalinate, was tested in a 4 year field trial. Besides the standard efficacy analysis expressed through the number of larvae per stem, a damage rating scale was introduced and modelled using a regression model for ordinal categorical data. RESULTS Compared with the control, expressed through damage rating and larval number, treatments with chlorpyriphos + cypermethrin and bifenthrin, showed higher efficacy in the control of stem weevils compared with alpha-cypermethrin and pirimiphos-methyl. The lowest efficacy was observed in treatments with tau-fluvalinate and thiacloprid. CONCLUSION This study showed that a combined efficacy evaluation expressed through both damage rating scale and the count of larvae, supported by an ordinal regression model for data analysis, is indispensable for obtaining accurate results. © 2017 Society of Chemical Industry
- Subjects
BIFENTHRIN; REGRESSION analysis; INSECTICIDE application
- Publication
Pest Management Science, 2017, Vol 73, Issue 9, p1962
- ISSN
1526-498X
- Publication type
Article
- DOI
10.1002/ps.4568