Effects of insecticide treatment against blue stem weevil (Ceutorhynchus sulcicollis) and cabbage stem weevil (C. pallidactylus) on crop injury and yield in winter oilseed rape (Brassica napus)
Ola Lundin , Rebecka Alaton , Lovisa Eriksson , Fabian A. Boetzl
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引用次数: 0
Abstract
Blue stem weevil (Ceutorhynchus sulcicollis) and cabbage stem weevil (C. pallidactylus) can occur in high numbers in winter oilseed rape (Brassica napus) fields in Sweden, but their impact on crop yield is poorly known, hindering the development of evidence-based pest management recommendations. We conducted five field experiments in two cropping seasons, where we tested pyrethroid insecticide application in autumn targeting C. sulcicollis, in spring targeting C. pallidactylus, as well as combined applications in autumn and spring targeting both species. We evaluated stem injury, emergence of the new generation of weevils and crop yield and oil content. Insecticide treatment in autumn reduced stem injury length and severity by C. sulcicollis, whereas insecticide treatment in spring did not affect stem injury. Emergence of the two species was similar across all treatments, which possibly was an artefact of limited sampling effort and small-scale spatial heterogeneity in emergence. Insecticide treatment in autumn, spring or a combined treatment all increased yield by 8–10 % (185–245 kg ha−1) with minor effects on oil content. Our results show that C. sulcicollis cause significant yield loss that can be reduced by insecticide treatment in autumn, which therefore can be economically motivated, whereas the results for insecticide treatment in spring targeting C. pallidactylus are inconclusive. Stem mining weevils are just some of several insect pests that can be economically important in oilseed rape and the availability of insecticides is declining. This calls for research into preventative pest management and well-motivated use of the few insecticides that remain in use.
期刊介绍:
The Editors of Crop Protection especially welcome papers describing an interdisciplinary approach showing how different control strategies can be integrated into practical pest management programs, covering high and low input agricultural systems worldwide. Crop Protection particularly emphasizes the practical aspects of control in the field and for protected crops, and includes work which may lead in the near future to more effective control. The journal does not duplicate the many existing excellent biological science journals, which deal mainly with the more fundamental aspects of plant pathology, applied zoology and weed science. Crop Protection covers all practical aspects of pest, disease and weed control, including the following topics:
-Abiotic damage-
Agronomic control methods-
Assessment of pest and disease damage-
Molecular methods for the detection and assessment of pests and diseases-
Biological control-
Biorational pesticides-
Control of animal pests of world crops-
Control of diseases of crop plants caused by microorganisms-
Control of weeds and integrated management-
Economic considerations-
Effects of plant growth regulators-
Environmental benefits of reduced pesticide use-
Environmental effects of pesticides-
Epidemiology of pests and diseases in relation to control-
GM Crops, and genetic engineering applications-
Importance and control of postharvest crop losses-
Integrated control-
Interrelationships and compatibility among different control strategies-
Invasive species as they relate to implications for crop protection-
Pesticide application methods-
Pest management-
Phytobiomes for pest and disease control-
Resistance management-
Sampling and monitoring schemes for diseases, nematodes, pests and weeds.