Velvetleaf (<i>Abutilon theophrasti</i>) Recruitment, Survival, Seed Production, and Interference in Soybean (<i>Glycine max</i>)

Lindquist, John L.; Maxwell, Bruce D.; Buhler, Douglas D.; Gunsolus, Jeffrey L.

doi:10.1017/s004317450008111x

Cited by 58 publications

(51 citation statements)

References 33 publications

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“…One of the principal reasons for crop rotations has been to avoid the buildup of high inoculum loads of key plant pathogens. Lindquist et al (1995) and Hartzler (1996) have suggested that velvetleaf can be subjected to significant density-dependent dieback events caused by an unidentified Verticillium sp. Similarly, Fellows and Roeth (1992) showed that the recruitment of sorghum seeds from the seed bank was improved by treatment of seeds with fungicides when they were buried in the fall.…”

Section: Conservation Biocontrolmentioning

confidence: 99%

Where are the bioherbicides?

Hallett

2005

Weed Science

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Since commercialization of Collego™ and Devine™ in the early 1980s, there has been a small but consistent research effort in the area of bioherbicides. The bioherbicide approach has promised effective weed management in cropping systems where the classical approach (using exotic natural enemies) is largely unsuitable. The overriding principle of the bioherbicide approach has been that a host-specific, coevolved natural enemy can be used as a bioherbicide when applied in simple formulations at inundative levels; however, two decades of research has effectively disproven this principle. Although research has revealed weaknesses in the bioherbicide approach, it has also revealed potential in a number of areas. A number of niche situations will remain in which host-specific plant pathogens can be developed as bioherbicides, such as for parasitic weeds and narcotic plants, but more research should be conducted with virulent, broad host range organisms, and more effort should be devoted to developing techniques for the cultural and genetic enhancement of bioherbicidal organisms.

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Section: Conservation Biocontrolmentioning

confidence: 99%

Where are the bioherbicides?

Hallett

2005

Weed Science

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“…This effect is magnified in the June cohorts, which had more difficult conditions to survive compared to more developed plants. Lindquist (1995) suggested a competition for light so that the late velvetleaf seedlings would be more affected due to a great canopy closure than to the present plant density. (Mulugeta and Stoltenberg 1997).…”

Section: Seedling Survivalmentioning

confidence: 99%

“…As was noted, for this species, by Lindquist et al (1995), the differences between cohort fecundity would be due to the fact that the earlier emerging plants will have an inherent advantage over later emerging individuals and therefore will be responsible for producing a greater number of seeds. These late emerged plants in a high density of other plants seem to present delayed reproduction and show a lower allocation to reproduction due to competition for light (Mabry and Wayne 1997).…”

Section: Seed Productionmentioning

confidence: 99%

“…the emergence rate was 6.5% (data not shown). This value is very similar to the one reported by Lindquist et al (1995) and 2% higher than those estimated by Pacala and Silander in soybean (1990). This similarity reflects that, in the same season, the emergence of a cohort from the seed bank is independent of the number of previous cohorts, which have previously germinated and seems to be mainly promoted by the field irrigation during the late spring season.…”

Section: Seed Bank Populationmentioning

confidence: 99%

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Phenological and demographic behaviour of an exotic invasive weed in agroecosystems

et al. 2005

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An experimental work was conducted in Lleida (Spain) aiming to characterise the phenology and to quantify the demographic processes regulating the populations of Abutilon theophrasti Medicus in maize fields. Seedling emergence started a few days after crop sowing in early May and continued during two more months. The vegetative phase was very long due to the late seeding emergence; these later emerged plants showed a slower development, and many of them did not reach the fertility stage. A flowering peak was observed 12 weeks after emergence in late July, and fruit dehiscence and seed setting started in mid August, several weeks before crop harvest. Four different cohorts were identified, and two main peaks of emergence were determined 21 and 49 days after crop sowing nearest related with field irrigation. A functional logarithmic relationship between cumulative growing degree-days (GDD) and cumulative emergence was also described. The resulting demographic diagram reflects greater values relating to seedling survival for May cohorts (90.2 vs 7.9%), to fertility (100 vs 75%) and to fecundity (3774 vs 92 seeds pl )1 ) than those determined for the June cohorts. The late emerged plants are subjected to a high density and are strongly affected by light competition, and their reproductive phase initiation delay is of about 10-20 days. In an assay conducted in Petri dishes, the seeds provided from plants emerged earlier were found more vigorous and germinated more than those from late emerged plants, which seem to be affected by incomplete fruit and seed ripening. Following the crop cycle without any weed control, the population rate increase was about 21.2. These values explain the high invasion capacity of this weed in the local summer irrigated fields, which consists in assuring their presence through a persistent soil seed bank and increasing the probability to spread to other fields.

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“…Velvetleaf (Abutilon theophrusti Medik.) seed production was reduced up to 82% by competition with soybean (Lindquist et al, 1995). Increased shading, which often occurs when weeds emerge later than the crop, also reduces seed production.…”

Section: Additions To the Seed Batikmentioning

confidence: 99%

Weed Seed Bank Dynamics

Buhler

Hartzler

Forcella

1997

Journal of Crop Production

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Weeds continue to have major impacts on crop production in spite of efforts to eliminate them. Most weed species rely on seed for regeneration and persistence. The species composition and density of weed seed in the soil vary greatly and are closely linked to the cropping history of the land. Altering tillage practices changes patterns of soil disturbance and weed seed depth in the soil, which plays a role in weed species shifrs. Crop rotation and weed control practices also impact the weed seed bank in the soil. Information on the weed seed bank should be a useful tool for integrated weed management. Decision aid models are being developed that use information on the coinposition of the weed seed bank to estimate weed populations, crop yield loss, and to recoirunend weed

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Velvetleaf (Abutilon theophrasti) Recruitment, Survival, Seed Production, and Interference in Soybean (Glycine max)

Cited by 58 publications

References 33 publications

Where are the bioherbicides?

Where are the bioherbicides?

Phenological and demographic behaviour of an exotic invasive weed in agroecosystems

Weed Seed Bank Dynamics

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