Interference of large crabgrass (Digitaria sanguinalis), redroot pigweed (Amaranthus retroflexus), and hairy galinsoga (Galinsoga ciliata) with bell pepper

Fu, Rongwei; Ashley, Richard

doi:10.1614/ws-05-053r1.1

Cited by 32 publications

(31 citation statements)

References 29 publications

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“…However, E. spinosa was a more competitive species than that of E. australis. These results are in line with those from Fu & Ashley, (2006) Increasing densities of Emex species in wheat progressively decreased the number of wheat grains per spike. At higher weed density, limited resources are available at the grain filling stage, as the presence of weeds shared these resources.…”

Section: Effects Of Emex Species Densities On Wheat Growth Yield Attsupporting

confidence: 91%

Wheat Yield Loss in a Two Species Competition with Emex australis and Emex spinosa

et al. 2016

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-Emex australis and E. spinosa are significant weed species in wheat and other crops. Information on the extent of competition of the Emex species will be helpful to access yield losses in wheat. Field experiments were conducted to quantify the interference of tested weed densities each as single or mixture of both at 1:1 on their growth and yield, wheat yield components and wheat grain yield losses in two consecutive years. Dry weight of both weed species increased from 3-6 g m -2 with every additional plant of weed, whereas seed number and weight per plant decreased with increasing density of either weed. Both weed species caused considerable decrease in yield components like spike bearing tillers, number of grains per spike, 1000-grain weight of wheat with increasing density population of the weeds. Based on non-linear hyperbolic regression model equation, maximum yield loss at asymptotic weed density was estimated to be 44 and 62% with E. australis, 56 and 70% with E. spinosa and 63 and 72% with mixture of both species at 1:1 during both year of study, respectively. It was concluded that E. spinosa has more competition effects on wheat crop as compared to E. australis. Keywords

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Section: Effects Of Emex Species Densities On Wheat Growth Yield Attsupporting

confidence: 91%

Wheat Yield Loss in a Two Species Competition with Emex australis and Emex spinosa

et al. 2016

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“…Therefore, we conclude that the residual benefits of cover crops alone are not sufficient to provide adequate weed control to ensure high yields. Although the critical weed-free period for bell pepper is not known, this research shows that an extended period of effective control is essential for preventing pepper yield loss, which agrees with research by Fu and Ashley (2006), in that fruit yield loss can exceed 60% when D. sanguinalis emerges 2 WATP bell pepper.…”

Section: Crop Responsesupporting

confidence: 88%

Suppression of Digitaria sanguinalis and Amaranthus palmeri using autumn‐sown glucosinolate‐producing cover crops in organically grown bell pepper

et al. 2007

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Summary Experiments were conducted to compare growth characteristics, biomass production and glucosinolate content of seven autumn‐planted glucosinolate‐producing cover crops that were terminated the following spring. The control of Digitaria sanguinalis and Amaranthus palmeri following cover crop incorporation into soil was characterised and fruit yields of bell pepper transplanted into cover crop‐amended soil were determined. Differences in glucosinolate concentration and composition were noted between cover crop roots and shoots and among cover crops. Total biomass production by cover crops ranged from 103 g m−2 for garden cress to 894 g m−2 for Indian mustard (F‐E75), but cover crop biomass was not correlated with D. sanguinalis and A. palmeri control. D. sanguinalis and A. palmeri control in bell pepper varied by cover crop. D. sanguinalis control by cover crops ranged from 38% to 79%, and A. palmeri control was 23% to 48% at 4 weeks after transplanting (WATP) bell pepper in 2004. D. sanguinalis control was positively correlated with total glucosinolate production, but A. palmeri control was not. D. sanguinalis control in 2005 ranged from 0% to 38% at 2 WATP. In the absence of weeds, cover crops did not negatively affect fruit yields which were often higher than in the absence of a cover crop. Glucosinolate‐producing cover crops are not a stand‐alone weed management strategy, but some will provide early season control of D. sanguinalis and A. palmeri without having a negative effect on transplanted bell pepper.

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“…Table 2. Delay in emergence may contribute to lower yield losses caused by D. stramonium, since small early differences in growth can be transformed into large differences in competition much later (Cousens et al, 2003;Fu and Ashley, 2006). Xanthium strumarium was a persistent, interfering weed whether growing alone or with other weeds, owing to its above-ground competitive ability for canopy space and light, as has been found in soybean (Regnier and Stoller, 1989;Mosier and Oliver, 1995).…”

Section: Discussionmentioning

confidence: 92%

Maize and Weed Growth under Multispecies Competition

et al. 2015

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Multispecies competition effects of Xanthium strumarium L. and Datura stramonium L. have not been characterized in maize (Zea mays L.). Such information would be useful in developing an integrated approach to managing these two problematic weeds. Field experiments were conducted during 2 yr to evaluate multiple weed species interference of X. strumarium and D. stramonium at the total densities of 0, 4, 8, 12, and 16 plants m−2 (alone, and all possible combinations of the two weeds) with maize. Crop yield was associated with the density of D. stramonium and X. strumarium and decreased severely with increasing weed density. The maximum maize yield loss (63%) occurred when 12 X. strumarium and 4 D. Stramonium plants m−2 were allowed to compete with the crop. The total weed density (expressed in X. strumarium equivalent density) required to cause a 5% maize yield loss was about 0.50 and 0.56 plants m−2 in 2006 and 2007, respectively. Total canopy leaf area index and crop yield were reduced more strongly by competition with X. strumarium than with D. stramonium. Averaged over multispecies populations, X. strumarium contributed 84 and 67% of the total weed biomass in the first and second years, respectively. Owing to the high competitive ability and biomass production of X. strumarium in mixed crop and weed communities, it should be given a greater priority for control than D. stramonium in maize.

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Interference of large crabgrass (Digitaria sanguinalis), redroot pigweed (Amaranthus retroflexus), and hairy galinsoga (Galinsoga ciliata) with bell pepper

Cited by 32 publications

References 29 publications

Wheat Yield Loss in a Two Species Competition with Emex australis and Emex spinosa

Wheat Yield Loss in a Two Species Competition with Emex australis and Emex spinosa

Suppression of Digitaria sanguinalis and Amaranthus palmeri using autumn‐sown glucosinolate‐producing cover crops in organically grown bell pepper

Maize and Weed Growth under Multispecies Competition

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