Cover crop effects on horseweed (Erigeron canadensis) density and size inequality at the time of herbicide exposure

John Wallace, William S. Curran, David Mortensen

Research output: Contribution to journalArticle

Abstract

Proactive integrated weed management (IWM) is critically needed in no-till production to reduce the intensity of selection pressure for herbicide-resistant weeds. Reducing the density of emerged weed populations and the number of larger individuals within the population at the time of herbicide application are two practical management objectives when integrating cover crops as a complementary tactic in herbicide-based production systems. We examined the following demographic questions related to the effects of alternative cover-cropping tactics following small grain harvest on preplant, burndown management of horseweed (Erigeron canadensis L.) in no-till commodity-grain production: (1) Do cover crops differentially affect E. canadensis density and size inequality at the time of herbicide exposure? (2) Which cover crop response traits are drivers of E. canadensis suppression at time of herbicide exposure? Interannual variation in growing conditions (study year) and intra-annual variation in soil fertility (low vs. high nitrogen) were the primary drivers of cover crop response traits and significantly affected E. canadensis density at the time of herbicide exposure. In comparison to the fallow control, cover crop treatments reduced E. canadensis density 52% to 86% at the time of a preplant, burndown application. Cereal rye (Secale cereale L.) alone or in combination with forage radish (Raphanus sativus L.) provided the most consistent E. canadensis suppression. Fall and spring cover crop biomass production was negatively correlated with E. canadensis density at the preplant burndown application timing. Our results also show that winter-hardy cover crops reduce the size inequality of E. canadensis populations at the time of herbicide exposure by reducing the number of large individuals within the population. Finally, we advocate for advancement in our understanding of complementarity between cover crop- and herbicide-based management tactics in no-till systems to facilitate development of proactive, herbicide-resistant management strategies.

Original languageEnglish (US)
Pages (from-to)327-338
Number of pages12
JournalWeed Science
Volume67
Issue number3
DOIs
StatePublished - May 1 2019

Fingerprint

Conyza canadensis
cover crops
herbicides
no-tillage
herbicide-resistant weeds
integrated weed management
application timing
Raphanus sativus
Secale cereale
radishes
products and commodities
rye
fallow
pesticide application
soil fertility
biomass production
production technology
demographic statistics
weeds
forage

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Plant Science

Cite this

@article{a388e8a3fb3849ba8297dc9bc4a2168c,
title = "Cover crop effects on horseweed (Erigeron canadensis) density and size inequality at the time of herbicide exposure",
abstract = "Proactive integrated weed management (IWM) is critically needed in no-till production to reduce the intensity of selection pressure for herbicide-resistant weeds. Reducing the density of emerged weed populations and the number of larger individuals within the population at the time of herbicide application are two practical management objectives when integrating cover crops as a complementary tactic in herbicide-based production systems. We examined the following demographic questions related to the effects of alternative cover-cropping tactics following small grain harvest on preplant, burndown management of horseweed (Erigeron canadensis L.) in no-till commodity-grain production: (1) Do cover crops differentially affect E. canadensis density and size inequality at the time of herbicide exposure? (2) Which cover crop response traits are drivers of E. canadensis suppression at time of herbicide exposure? Interannual variation in growing conditions (study year) and intra-annual variation in soil fertility (low vs. high nitrogen) were the primary drivers of cover crop response traits and significantly affected E. canadensis density at the time of herbicide exposure. In comparison to the fallow control, cover crop treatments reduced E. canadensis density 52{\%} to 86{\%} at the time of a preplant, burndown application. Cereal rye (Secale cereale L.) alone or in combination with forage radish (Raphanus sativus L.) provided the most consistent E. canadensis suppression. Fall and spring cover crop biomass production was negatively correlated with E. canadensis density at the preplant burndown application timing. Our results also show that winter-hardy cover crops reduce the size inequality of E. canadensis populations at the time of herbicide exposure by reducing the number of large individuals within the population. Finally, we advocate for advancement in our understanding of complementarity between cover crop- and herbicide-based management tactics in no-till systems to facilitate development of proactive, herbicide-resistant management strategies.",
author = "John Wallace and Curran, {William S.} and David Mortensen",
year = "2019",
month = "5",
day = "1",
doi = "10.1017/wsc.2019.3",
language = "English (US)",
volume = "67",
pages = "327--338",
journal = "Weed Science",
issn = "0043-1745",
publisher = "Weed Science Society of America",
number = "3",

}

Cover crop effects on horseweed (Erigeron canadensis) density and size inequality at the time of herbicide exposure. / Wallace, John; Curran, William S.; Mortensen, David.

In: Weed Science, Vol. 67, No. 3, 01.05.2019, p. 327-338.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Cover crop effects on horseweed (Erigeron canadensis) density and size inequality at the time of herbicide exposure

AU - Wallace, John

AU - Curran, William S.

AU - Mortensen, David

PY - 2019/5/1

Y1 - 2019/5/1

N2 - Proactive integrated weed management (IWM) is critically needed in no-till production to reduce the intensity of selection pressure for herbicide-resistant weeds. Reducing the density of emerged weed populations and the number of larger individuals within the population at the time of herbicide application are two practical management objectives when integrating cover crops as a complementary tactic in herbicide-based production systems. We examined the following demographic questions related to the effects of alternative cover-cropping tactics following small grain harvest on preplant, burndown management of horseweed (Erigeron canadensis L.) in no-till commodity-grain production: (1) Do cover crops differentially affect E. canadensis density and size inequality at the time of herbicide exposure? (2) Which cover crop response traits are drivers of E. canadensis suppression at time of herbicide exposure? Interannual variation in growing conditions (study year) and intra-annual variation in soil fertility (low vs. high nitrogen) were the primary drivers of cover crop response traits and significantly affected E. canadensis density at the time of herbicide exposure. In comparison to the fallow control, cover crop treatments reduced E. canadensis density 52% to 86% at the time of a preplant, burndown application. Cereal rye (Secale cereale L.) alone or in combination with forage radish (Raphanus sativus L.) provided the most consistent E. canadensis suppression. Fall and spring cover crop biomass production was negatively correlated with E. canadensis density at the preplant burndown application timing. Our results also show that winter-hardy cover crops reduce the size inequality of E. canadensis populations at the time of herbicide exposure by reducing the number of large individuals within the population. Finally, we advocate for advancement in our understanding of complementarity between cover crop- and herbicide-based management tactics in no-till systems to facilitate development of proactive, herbicide-resistant management strategies.

AB - Proactive integrated weed management (IWM) is critically needed in no-till production to reduce the intensity of selection pressure for herbicide-resistant weeds. Reducing the density of emerged weed populations and the number of larger individuals within the population at the time of herbicide application are two practical management objectives when integrating cover crops as a complementary tactic in herbicide-based production systems. We examined the following demographic questions related to the effects of alternative cover-cropping tactics following small grain harvest on preplant, burndown management of horseweed (Erigeron canadensis L.) in no-till commodity-grain production: (1) Do cover crops differentially affect E. canadensis density and size inequality at the time of herbicide exposure? (2) Which cover crop response traits are drivers of E. canadensis suppression at time of herbicide exposure? Interannual variation in growing conditions (study year) and intra-annual variation in soil fertility (low vs. high nitrogen) were the primary drivers of cover crop response traits and significantly affected E. canadensis density at the time of herbicide exposure. In comparison to the fallow control, cover crop treatments reduced E. canadensis density 52% to 86% at the time of a preplant, burndown application. Cereal rye (Secale cereale L.) alone or in combination with forage radish (Raphanus sativus L.) provided the most consistent E. canadensis suppression. Fall and spring cover crop biomass production was negatively correlated with E. canadensis density at the preplant burndown application timing. Our results also show that winter-hardy cover crops reduce the size inequality of E. canadensis populations at the time of herbicide exposure by reducing the number of large individuals within the population. Finally, we advocate for advancement in our understanding of complementarity between cover crop- and herbicide-based management tactics in no-till systems to facilitate development of proactive, herbicide-resistant management strategies.

UR - http://www.scopus.com/inward/record.url?scp=85065742961&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85065742961&partnerID=8YFLogxK

U2 - 10.1017/wsc.2019.3

DO - 10.1017/wsc.2019.3

M3 - Article

AN - SCOPUS:85065742961

VL - 67

SP - 327

EP - 338

JO - Weed Science

JF - Weed Science

SN - 0043-1745

IS - 3

ER -