scholarly journals How contradictory EU policies led to the development of a pest: the story of oilseed rape and the cabbage stem flea beetle

GCB Bioenergy ◽  
2022 ◽  
Author(s):  
Patricia Ortega‐Ramos ◽  
Samantha M. Cook ◽  
Alice L. Mauchline
Keyword(s):  
Oilseed Rape ◽  
Flea Beetle ◽  
Eu Policies

Flea Beetle (Coleoptera: Chrysomelidae) Populations and Crop Yield in Field Pea and Oilseed Rape Intercrops

1994 ◽  
Vol 23 (3) ◽  
pp. 654-658 ◽  
Author(s):  
Michael J. Weiss ◽  
Blaine G. Schatz ◽  
John C. Gardner ◽  
Barbara A. Nead
Keyword(s):  
Crop Yield ◽  
Oilseed Rape ◽  
Flea Beetle ◽  
Field Pea

A commercially acceptable assessment technique for improved control of cabbage stem flea beetle feeding on winter oilseed rape

2001 ◽  
Vol 20 (10) ◽  
pp. 907-912 ◽  
Author(s):  
K.F.A Walters ◽  
A Lane ◽  
D.A Cooper ◽  
D Morgan
Keyword(s):  
Oilseed Rape ◽  
Flea Beetle ◽  
Winter Oilseed Rape ◽  
Assessment Technique

scholarly journals Economic Injury Levels for Flea Beetles (Phyllotreta spp.; Coleoptera: Chrysomelidae) in Spring Oilseed Rape (Brassica napus; Brassicales: Brassicaceae)

2019 ◽  
Vol 113 (2) ◽  
pp. 808-813 ◽  
Author(s):  
Ola Lundin
Keyword(s):  
Brassica Napus ◽  
Oilseed Rape ◽  
Field Experiments ◽  
Flea Beetle ◽  
Crop Growth ◽  
The European Union ◽  
Economic Injury Level ◽  
Flea Beetles ◽  
Crop Injury ◽  
Economic Injury

Abstract Flea beetles (Phyllotreta spp.) are major insect pests in spring oilseed rape (SOSR; Brassica napus L.). Prohibited use of three neonicotinoid insecticides in the European Union means that there are currently no insecticide seed treatment options available. Insecticide spraying remains as a control option, but there is a need to estimate the economic threshold for crop injury. As a first step to this end, economic injury levels were determined for flea beetles in SOSR. Data from 16 field experiments were used to quantify the relationship between flea beetle crop injury and SOSR yield, and additional data from paired sprayed and unsprayed plots in 12 commercial SOSR fields were used to determine the reduction in crop injury from a pyrethroid spray. There was a strong linear negative effect of flea beetle injury with 19 kg/ha yield loss per percent crop injury to seedlings and a pyrethroid spray reduced crop injury by 39%. These results gave an economic injury level of 11% defoliation of SOSR seedlings under average oilseed rape prices and insecticide use costs in 2017. This is considerably lower than previously used nominal thresholds of 25–30% injury to cotyledons. Increased yields and increasingly cheaper pyrethroids might be the reason for the lower levels of crop injury that warrant chemical control. The economic injury levels presented here can be used to construct economic thresholds that preferably should also take into account crop growth stage, crop growth rate, and anticipated flea beetle activity.

Effects of simulated and flea beetle injury to cotyledons on growth of drought-stressed oilseed rape, Brassica napus L.

1997 ◽  
Vol 77 (3) ◽  
pp. 475-481 ◽  
Author(s):  
Timothy M. Nowatzki ◽  
Michael J. Weiss
Keyword(s):  
Soil Moisture ◽  
Oilseed Rape ◽  
Flea Beetle ◽  
Field Capacity ◽  
Significant Loss ◽  
Growth Reduction ◽  
Post Injury ◽  
Brassica Napus L ◽  
Phyllotreta Cruciferae ◽  
Flea Beetles

Simulated injury was compared with flea beetle injury on cotyledons of oilseed rape grown at various soil moistures to determine the effects of injury on seedling growth in the greenhouse. The cotyledons of 7-d-old seedlings were injured at 0, 25, 50, and 75% of the total area with a 0.5-mm mechanical pencil or by flea beetles. The soil moisture was maintained at the field capacity, half field capacity, and the permanent wilting point. The growth response of the seedlings was compared for simulated flea beetle injury and soil moisture 7, 14, and 21 d post-injury, and for simulated and flea beetle injury, and soil moisture 7 d post-injury. Simulated injury had the greatest effect on seedlings grown at the field capacity, at 7 d post-injury. At the reduced soil moistures, increased levels of simulated injury were necessary to cause a significant loss in growth. By 14 and 21 d post-injury, compensation to the simulated injury occurred. Simulated injury caused significantly less growth reduction across all injury levels compared with flea beetle injury. However, at injury levels above 25%, both simulated and flea beetle injury had similar trends in growth reduction. The simulated injury tested in these experiments cannot be used in place of flea beetles for resistance screening studies, but may be useful if incorporated as a preliminary tool. Key words: Phyllotreta cruciferae, canola, oilseed rape, injury, damage response

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