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Effects of integrated pest management (IPM) on the population dynamics of the perennial weed species Cirsium arvense (L.) Scop

Tavaziva, Varwi Jacob (2017). Effects of integrated pest management (IPM) on the population dynamics of the perennial weed species Cirsium arvense (L.) Scop. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2017:110
ISBN 978-91-7760-110-4
eISBN 978-91-7760-111-1
[Doctoral thesis]

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Abstract

Cirsium arvense (L.) Scop. is a troublesome weed, causing economic losses by reducing crop yield, increasing herbicide and tillage costs, and degrading soils due to increased tillage requirements. The major control method for C. arvense is herbicide application, but this poses socio-environmental and herbicide resistance risks. The European Union promotes reduced dependence and sustainable use of herbicides, combined with cultural and mechanical weed control. This thesis assessed the effects of integrated weed control on the population dynamics of C. arvense.

For mechanical control, farmers are recommended to act when C. arvense is most sensitive to disturbance, i.e. at the point of minimum belowground weight, coinciding with 7-10 leaves per shoot. However, many farmers believe that this is too late. To estimate the compensation point (CP), defined as the minimum weight of the entire belowground structure of C. arvense, and identify links between initial root weight, planting depth and crop competition, three outdoor pot experiments were performed. For chemical control, farmers are recommended to spray when the majority of C. arvense shoots are 10-20 cm high. To assess the effects of timing and dose of herbicide application (MCPA), and crop competition on growth and development of C. arvense, one outdoor pot experiment and one field experiment were performed. The field experiment also assessed the effects of selective cutting.

It was found that CP for C. arvense occurred before 3-leaf stage and that treatment effects were minor (<0.5 leaf stages). Depletion of planted root fragments ceased on average around leaf stage 3-4, indicating that CP occurs at early leaf stages. In the pot experiment, the strongest effect of herbicide treatment was obtained by spraying with the recommended dose in the presence of a crop when the largest C. arvense shoot had 3-4 leaves, corresponding to maximum height 13 cm and median height 6 cm. Crop competition reduced biomass, shoot height and leaf production of C. arvense regardless of herbicide dose. In the field experiment, herbicide treatment at 4-5 leaves or 8-10 leaves gave similar control effects as selective cutting. Herbicide application had a more immediate effect on growth and development of C. arvense while selective cutting depleted the below-ground structures more gradually.

The results indicate that mechanical control of C. arvense should be performed earlier than previously recommended, probably before C. arvense reaches 3-4 leaves per shoot. Also early herbicide spraying seems to be as efficient as spraying later in the season.

Authors/Creators:Tavaziva, Varwi Jacob
Title:Effects of integrated pest management (IPM) on the population dynamics of the perennial weed species Cirsium arvense (L.) Scop
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :14 November 2017
Depositing date:27 November 2017
Volume:2017:110
Number of Pages:70
Papers/manuscripts:
NumberReferences
IT. Verwijst, V. J. Tavaziva & A. Lundkvist. Assessment of the compensation point of Cirsium arvense and effects of competition, root weight and burial depth on below-ground dry weight - leaf stage trajectories (submitted manuscript).
IIV. J. Tavaziva, A. Lundkvist & T. Verwijst. Effects of herbicide dose, timing of herbicide application and crop presence on growth and development of Cirsium arvense (manuscript).
IIIV. J. Tavaziva, A. Lundkvist & T. Verwijst. Effects of mechanical and chemical control on growth and development of Cirsium arvense under field conditions (manuscript).
IVT. Verwijst, V. J. Tavaziva & A. Lundkvist (2017). Effects of selcetive cutting and herbicide use in spring barley on seed production of Cirsium arvense. Acta Agriculturae Scandinavica, Section B - Soil & Plant Science 67:6, 562-570.
Place of Publication:Uppsala
Publisher:Department of Crop Production Ecology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-110-4
ISBN for electronic version:978-91-7760-111-1
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F62 Plant physiology - Growth and development
H Protection of plants and stored products > H60 Weeds and weed control
N Machinery and buildings > N20 Agricultural machinery and equipment
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Environmental Sciences related to Agriculture and Land-use
Agrovoc terms:Integrated Pest Management, population dynamics, weeds, Cirsium arvense, weed control, chemical weed control, cultural weed control, mechanical weed control, MCPA, selective felling
Keywords:cultural control, chemical control, compensation point, competition, creeping thistle, MCPA, mechanical control, selective cutting, spring barely
URN:NBN:urn:nbn:se:slu:epsilon-e-4507
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-4507
ID Code:14765
Faculty:NL - Faculty of Natural Resources and Agricultural Sciences (until 2013)
Department:(NL, NJ) > Dept. of Crop Production Ecology
Deposited By: Mr Varwi Jacob Tavaziva
Deposited On:28 Nov 2017 12:57
Metadata Last Modified:28 Nov 2017 12:57

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