Simulation Analysis of Weed Population Dynamics in Ridge-Tilled fields

Weed Science ◽  
1993 ◽  
Vol 41 (3) ◽  
pp. 468-474 ◽  
Author(s):  
Nicholas Jordan
Keyword(s):  
Population Dynamics ◽  
Weed Control ◽  
Seed Production ◽  
Simulation Analysis ◽  
Growth Zone ◽  
Effective Control ◽  
Long Term Effects ◽  
Seed Survival ◽  
Weed Population ◽  
Weed Population Dynamics

Effects of nonchemical weed control on weed and seedbank demography in ridge-tilled fields were simulated to examine long-term effects on weed population dynamics. Ridge tillage entails active seedbank management, including removal of much of the seedbank from the crop growth zone (ridge) to the interridge zone (furrow) at planting, and other seedbank manipulations. Dynamics of simulated yellow foxtail and velvetleaf populations were sharply sensitive to the rate of seed removal from the ridge. Variation in winter seed survival, ridge plant demography (emergence, survival, and seed production), and seed survival in the furrow after removal from the ridge also had strong effects on simulated dynamics. To prevent rapid population growth in a simulated corn-soybean rotation, very effective control of seedlings emerging with each crop was necessary to offset seed production from seedlings emerging after ridge rebuilding in corn years. Dynamics of both species were highly sensitive to cultivation efficiency. Effective “rescue” weed control must be available to prevent sharp increases in weed seedbanks during years when cultivation is ineffective.

Weed Population Dynamics and Weed Control in the Peruvian Amazon

1990 ◽  
Vol 82 (1) ◽  
pp. 102-112 ◽  
Author(s):  
Jane Mt. Pleasant ◽  
R. E. McCollum ◽  
H. D. Coble
Keyword(s):  
Population Dynamics ◽  
Weed Control ◽  
Peruvian Amazon ◽  
Weed Population ◽  
Weed Population Dynamics

Modeling Population Dynamics of Kochia (Bassia scoparia) in Response to Diverse Weed Control Options

Weed Science ◽  
2019 ◽  
Vol 67 (1) ◽  
pp. 57-67 ◽  
Author(s):  
O. Adewale Osipitan ◽  
J. Anita Dille ◽  
Muthukumar V. Bagavathiannan ◽  
Stevan Z. Knezevic
Keyword(s):  
Population Dynamics ◽  
Population Growth ◽  
Weed Control ◽  
Seed Production ◽  
Seedling Recruitment ◽  
Control Strategies ◽  
Effective Control ◽  
Parameter Estimates ◽  
Herbicide Resistant

AbstractKochia [Bassia scoparia(L.) A. J. Scott] is a problematic weed species across the Great Plains, as it is spreading fast and has developed herbicide-resistant biotypes. It is imperative to understand key life-history stages that promote population expansion ofB. scopariaand control strategies that would provide effective control of these key stages, thereby reducing population growth. Diversifying weed control strategies has been widely recommended for the management of herbicide-resistant weeds. Therefore, the objectives of this study were to develop a simulation model to assess the population dynamics ofB. scopariaand to evaluate the effectiveness of diverse weed control strategies on long-term growth rates ofB. scopariapopulations. The model assumed the existence of a glyphosate-resistant (GR) biotype in theB. scopariapopulation, but at a very low proportion in a crop rotation that included glyphosate-tolerant corn (Zea maysL.) and soybean [Glycine max(L.) Merr.]. The parameter estimates used in the model were obtained from various ecological and management studies onB. scoparia. Model simulations indicated that seedling recruitment and survival to seed production were more important than seedbank persistence forB. scopariapopulation growth rate. Results showed that a diversified management program, including glyphosate, could provide excellent control ofB. scopariapopulations and potentially eliminate already evolved GRB. scopariabiotypes within a given location. The most successful scenario was a diverse control strategy that included one or two preplant tillage operations followed by preplant or PRE application of herbicides with residual activities and POST application of glyphosate; this strategy reduced seedling recruitment, survival, and seed production during the growing season, with tremendous negative impacts on long-term population growth and resistance risk inB. scoparia.

WEED POPULATION DYNAMICS IN RECENTLY ESTABLISHED TIMOTHY STANDS: GROWTH AND PHYSIOGNOMY OF THE WEED COMPONENTS

1987 ◽  
Vol 67 (4) ◽  
pp. 1035-1044
Author(s):  
C. LEMIEUX ◽  
A. K. WATSON ◽  
J.-M. DESCHÊNES
Keyword(s):  
Population Dynamics ◽  
Weed Control ◽  
Management System ◽  
Red Clover ◽  
Phleum Pratense ◽  
Botanical Composition ◽  
Short Term ◽  
Weed Population ◽  
Weed Population Dynamics

In two experiments conducted in the field between 1983 and 1985, timothy was established with or without barley, red clover, grassy weeds and broadleaf weeds. The plots were sampled during establishment and production years. At each sampling, the botanical composition was evaluated to characterize the weed populations. Throughout establishment, the weed populations were dominated by annual broadleaf and grassy weeds which, when growing separately, produced comparable amounts of biomass. However, when growing together, the grassy weeds were clearly dominated by the broadleaf weeds. During the subsequent production years, the weedy populations were dominated by perennial broadleaf weeds. Neither the structure of the weed populations, nor the short-term dynamics of the grassy weed populations were affected by the management system used. However, the short-term dynamics of the broadleaf weed populations were influenced by barley, red clover and the weed control treatments applied during the year of establishment. The use of barley accelerated the growth of the broadleaf weed populations while red clover delayed it. Subsequent broadleaf weed populations were noticeably larger in the plots where they were allowed to grow during the establishment year.Key words: Broadleaf weeds, grassy weeds, Phleum pratense, competition, short-term dynamics

scholarly journals Weed Seedbank Management: Revisiting How Herbicides Are Evaluated

Weed Science ◽  
2018 ◽  
Vol 66 (4) ◽  
pp. 415-417 ◽  
Author(s):  
Jason K. Norsworthy ◽  
Nicholas E. Korres ◽  
Muthukumar V. Bagavathiannan
Keyword(s):  
Population Dynamics ◽  
Weed Control ◽  
Effective Management ◽  
Weed Seed ◽  
Weed Population ◽  
Weed Density ◽  
Weed Population Dynamics ◽  
Herbicide Treatments ◽  
Density And Biomass

AbstractThere is great value in quantifying and reporting weed seed production as a component of herbicide efficacy evaluations for two reasons. First, visual weed control ratings and associated measurements such as weed density and biomass are not sufficient indicators of fecundity. Second, knowledge of fecundity associated with herbicide treatments can guide the development of effective management programs that impact long-term weed population dynamics and reduce the risk of herbicide resistance.

Weed Population Dynamics after Six Years under Glyphosate- and Conventional Herbicide-based Weed Control Strategies

Crop Science ◽  
2008 ◽  
Vol 48 (3) ◽  
pp. 1170 ◽  
Author(s):  
Philip Westra ◽  
Robert G. Wilson ◽  
Stephen D. Miller ◽  
Phillip W. Stahlman ◽  
Gail W. Wicks ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Weed Control ◽  
Control Strategies ◽  
Weed Population ◽  
Weed Population Dynamics
Sign in / Sign up

Export Citation Format

Share Document