Analysis of oilseed rape stem weevil chemical control using a damage rating scale

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 + c...

Full description

Saved in:
Bibliographic Details
Published in:Pest management science 2017-09, Vol.73 (9), p.1962-1971
Main Authors: Milovac, Željko, Zorić, Miroslav, Franeta, Filip, Terzić, Sreten, Petrović Obradović, Olivera, Marjanović Jeromela, Ana
Format: Article
Language:English
Subjects:
Agrochemicals
Animals
Brassica
Ceutorhynchus napi
Ceutorhynchus pallidactylus
Chemical control
Cypermethrin
Damage assessment
Data analysis
Data processing
Effectiveness
Fluvalinate
Herbivores
insecticide efficacy
Insecticides
Larva
Larvae
Pest Control - statistics & numerical data
Pests
Pirimiphos-methyl
proportional odds model
Rape plants
Rapeseed
Regression analysis
Scale (ratio)
Thiacloprid
Weevils
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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
ISSN:1526-498X
1526-4998
DOI:10.1002/ps.4568