Using plant population biology in weed research: a strategy to improve weed management

Navas, M. L.

doi:10.1111/j.1365-3180.1991.tb01756.x

Cited by 64 publications

(33 citation statements)

References 44 publications

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“…Vários autores (Thornton et al, 1990;Navas, 1991;Maxwell & Ghersa, 1992;Wiles et al, 1992) Figura 1 -Índice de valor de importância das principais espécies de plantas daninhas na bananicultura cultivada em área de várzea drenada, no município de Registro-SP.…”

Section: Resultsunclassified

Cadastramento fitossociológico de plantas daninhas na bananicultura

Gomes¹,

Ibrahim²,

Macedo³

et al. 2010

Planta daninha

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RESUMO -O objetivo deste experimento, realizado na cultura da banana (Musa spp.) no Vale do Ribeira, no município de Registro-SP, foi fazer um cadastramento fitossociológico das espécies de plantas daninhas sob duas formas de manejo do solo. A amostragem das espécies daninhas foi feita em duas áreas distintas de manejo, sendo uma com a cultura implantada em área de várzea drenada a 7 m de altitude e a outra com a bananicultura em área de sequeiro a 16 m de altitude. Na amostragem de um hectare, utilizou-se o método do quadrado inventário para cálculo de frequência, frequência relativa, densidade, densidade relativa, abundância, abundância relativa, índice de valor de importância e índice de importância relativa. Em ambas as áreas foram identificadas 10 famílias, distribuídas em 18 gêneros e 21 espécies. Na área de várzea drenada, 38% das famílias identificadas são monocotiledôneas e 62% dicotiledôneas, num total de 15 espécies, distribuídas em nove famílias. Na área de cultivo em sistema de sequeiro, foram identificados 50% de famílias monocotiledôneas e 50% de dicotiledôneas, num total de 11 espécies, distribuídas em seis famílias. As famílias com maior representatividade foram Poaceae, com sete espécies, seguida de Asteraceae, com três. Com o estudo realizado, verificou-se ainda grande diversidade de espécies nas áreas selecionadas.Palavras-chave: bananicultura, fitossociologia, plantas daninhas, manejo do solo.ABSTRACT -The objective of this work was to carry out a phytosociological assessment of the weed species occurring in the banana (Musa spp.) culture, under two forms of soil management. The weed community sampling was carried out under field conditions in the Ribeira Valley, Registro, Sao Paulo. The weed species sampling was carried out in two areas, the first with the banana culture implanted in a wet area at seven meters of altitude and the second in a dry area at 16 meters of altitude. In both areas, the sample was carried out in one hectare, using the square inventory to calculate frequency, relative frequency, density, relative density, abundance, relative abundance, importance index and relative importance. In both areas, 10 families were identified, distributed in 18 genus and 21 species; 38% of the families identified in the wet area were monocots and 62% dicots, totalizing 15 species distributed in six families. The most representative families were Poaceae, with seven species, followed by Asteraceae, with three species. This study made evident the large diversity of species in the selected area.

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Section: Resultsunclassified

Cadastramento fitossociológico de plantas daninhas na bananicultura

Gomes¹,

Ibrahim²,

Macedo³

et al. 2010

Planta daninha

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“…This was true for both broadleaf weeds (Wiles et al, 1992) and grasses (Marshall, 1988). Incorporation of the inherent patchiness of weed infestations into statistical models requiring weed distribution inputs then became a priority for much research in weed science (Brian and Cousens, 1990;Maxwell and Ghersa, 1992;Navas, 1991;Thornton et al, 1990;VanGroenendael, 1988).…”

Section: Measuring Weed Distributionmentioning

confidence: 98%

A Review on Remote Sensing of Weeds in Agriculture

Thorp

Tian

2004

Precision Agriculture

235

127

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In the effort of developing precision agriculture tools, remote sensing has been commonly considered as an effective technique for weed patch delineation, where weed infestations are detected based on variations in the plant canopy spectral response. Because the canopy spectral response is important for weed detection, discussions on the irradiative interaction of light in plant canopies and the effect of variable soil background on the canopy spectral response are presented in this review. Also, a presentation of the current techniques for removal of soil effects, including vegetation indices and spectral mixture analysis, shows that these techniques have not been adequately developed for use in remote sensing-based weed detection applications. Given the nature of light interaction in a plant canopy, this review proposes that the spectral response of a plant canopy depends on both the species and the biomass density. Remote detection of weeds from ground-, aircraft-, and satellite-based platforms has been accomplished on a wide scale, yet the use of these weed detection methods to make variable-rate herbicide applications has not occurred as often. By judging success based on variable-rate herbicide applications rather than precise weed localization, some of the current problems in weed sensing may be skirted.

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“…Cuscuta species take water and nutrients from and, as a result, reduce the growth of M. micrantha by smothering the plant to prevent light penetration (Han et al 2002;Hao et al 2005). After germination and early non-parasitic phase of growth, a long, thin, rootless, yellow-orange leafless stem coils around adjacent objects (Nadler-Hassar and Rubin 2003). When attached to the leaf or stem of a suitable host plant, thigmotropic responses and chemical recognition cause C. campestris to develop haustoria within a few days (Nadler-Hassar and Rubin 2003).…”

Section: Introductionmentioning

confidence: 98%

“…After germination and early non-parasitic phase of growth, a long, thin, rootless, yellow-orange leafless stem coils around adjacent objects (Nadler-Hassar and Rubin 2003). When attached to the leaf or stem of a suitable host plant, thigmotropic responses and chemical recognition cause C. campestris to develop haustoria within a few days (Nadler-Hassar and Rubin 2003). Successful haustoria regenerate new branches to attach another new leaf or stem.…”

Section: Introductionmentioning

confidence: 99%

Fine-scale clonal structure and diversity of invasive plant Mikania micrantha H.B.K. and its plant parasite Cuscuta campestris Yunker

Dong

2008

Biol Invasions

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The fine-scale clonal structure in the patch of the invasive plant Mikania micrantha H.B.K. and its plant parasite Cuscuta campestris Yunker were investigated by distinguishing genets using ISSR markers. A high level of clonal diversity (G/N = 0.7, D = 0.9579, E = 0.7778) in M. micrantha and a low level of clonal diversity (G/N = 0.2, D = 0.7632, E = 0.9479) in C. campestris might be due to the different reproductive strategies, different migration rates and different number of founder. Clonal composition of M. micrantha (14 genets of 20 ramets) and C. campestris (4 genets of 20 ramets) were significantly different. There was no relationship between host and parasite genetic distance matrices using Mantel test (r = 0.073, P = 0.150). Spatial autocorrelation analysis of M. micrantha showed that the correlation value was positive and significant at 2 m with an x-intercept of 3.5 and 4.0 m for distance class sizes of 1 and 2 m, respectively. Spatial autocorrelation analysis of C. campestris showed that the correlation value was positive and significant at 2 m and significantly negative at 10 m with an x-intercept of 4.8 and 6.6 m for distance class sizes of 1 and 2 m, respectively.

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Using plant population biology in weed research: a strategy to improve weed management

Cited by 64 publications

References 44 publications

Cadastramento fitossociológico de plantas daninhas na bananicultura

Cadastramento fitossociológico de plantas daninhas na bananicultura

A Review on Remote Sensing of Weeds in Agriculture

Fine-scale clonal structure and diversity of invasive plant Mikania micrantha H.B.K. and its plant parasite Cuscuta campestris Yunker

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