Benefits of a maize–bean–weeds mixed cropping system in Urubamba Valley, Peruvian Andes

Gianoli, Ernesto; Ramos, Isaías; Alfaro-Tapia, Armando; Valdéz, Yolvi; Echegaray, Erik R.; Yábar, Erick

doi:10.1080/09670870600796722

Cited by 28 publications

(16 citation statements)

References 32 publications

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“…Some investigations have not supported an effect of plant composition on ladybird habitat preference (Andow and Risch 1985; Gianoli et al 2006). Because the effects of plant genotypic diversity on trophic interactions can be due to a combination of interactive and additive effects among genotypes within genetically diverse patches (Johnson 2008), the strength of the effect may be context-specific rather than a general phenomenon.…”

Section: Discussionmentioning

confidence: 99%

Effect of within-species plant genotype mixing on habitat preference of a polyphagous insect predator

et al. 2010

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The effects of within-species plant genotype mixing on the habitat preference of a polyphagous ladybird were studied. Plant species diversity is often claimed to positively affect habitat preferences of insect predators, but the effects of within-species genotype diversity have not been extensively studied. In a field experiment with different barley (Hordeum vulgare) genotypes in mixed and pure stands, adult seven-spot ladybird Coccinella septempunctata, a polyphagous predator, preferred a specific combination of genotypes over the single genotypes alone before aphids had arrived in the crop, and again when aphids were emigrating. In laboratory experiments on adult ladybird orientation to odour from barley, ladybirds were attracted/arrested by the mixed odour of the same barley genotype mixture that was preferred in the field. Exposure of one barley genotype to volatiles from the other also caused the odour of the exposed plants to become more attractive to ladybirds. The results support the hypothesis that plant volatiles may attract or arrest foraging adult ladybirds, contributing to the selection of favourable habitats, and they show that within-species plant genotype mixing can shape interactions within multitrophic communities.

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Section: Discussionmentioning

confidence: 99%

Effect of within-species plant genotype mixing on habitat preference of a polyphagous insect predator

et al. 2010

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“…Many of these studies have been the subject of reviews (Risch et al 1983;Andow 1986) and of a meta-analysis (Tonhasca and Byrne 1994) showing that crop diversification leads, in 52-70% of cases, to a decrease in pest density. Since the publication of these reviews, several authors have added to the debate about the consequences of crop diversification for pests (Coll and Bottrell 1995;Theunissen et al 1995;Roininen et al 1996;Schellhorn and Sork 1997;Harmon et al 2003;Hooks and Johnson 2003;Aquilino et al 2005;Costamagna and Landis 2006;Gianoli et al 2006;Bjorkman et al 2007;Schmidt et al 2007). Seven of these papers reported that crop diversification successfully decreased the populations of some or all pests; four found that crop diversification had no effect, and one found that it led to an increase in the pest population.…”

Section: Effect Of a Cover Crop On Pest Communitiesmentioning

confidence: 98%

Agroecosystem management and biotic interactions: a review

Médiène

Valantin‐Morison

Sarthou

et al. 2011

Agronomy Sust. Developm.

147

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Increasing the use of synthetic fertilisers and pesticides in agroecosystems has led to higher crop yields, accompanied by a decline in biodiversity at the levels of field, cropping system and farm. Biodiversity decline has been favoured by changes at landscape level such as regional farm specialisation, increases in field size, and the removal of hedgerows and woodlots. The loss of biodiversity in agroecosystems has increased the need for external inputs because beneficial functions are no longer provided by beneficial species as natural enemies of crop pests and ecosystem engineers. This trend has led to a strong reliance on petrochemicals in agroecosystems. However, many scientists have been arguing for more than two decades that this reliance on petrochemicals could be considerably reduced by a better use of biotic interactions. This article reviews options to increase beneficial biotic interactions in agroecosystems and to improve pest management and crop nutrition whilst decreasing petrochemical use. Four agronomic options are presented. First, it has been shown that the choice of cultivar, the sowing date and nitrogen fertilisation practices can be manipulated to prevent interactions between pests and crop, in either time or space. Nevertheless, the efficacy of these manipulations may be limited by pest adaptation. Second, beneficial biotic interactions may result from appropriate changes to the habitats of natural enemies and ecosystem engineers, mediated by soil and weed management. Here, knowledge is scarce, and indirect and complex effects are poorly understood. Third, changes achieved by crop diversification and, fourth, by landscape adaptation are promising. However, these practices also present drawbacks that may not necessarily be outweighed by beneficial effects. Overall, these four management approaches provide a powerful framework to develop sustainable agronomic practices. (Résumé d'auteur

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“…and spiders (Albajes et al, 2009). Finally, other studies (Penagos et al, 2003;Gianoli et al, 2006) found no differences in the numbers of on-plant predators between weedy and non-weedy corn plots.…”

Section: )mentioning

confidence: 99%

Changes in Arthropod Fauna From Weed Management Practices in Genetically Modified Herbicide-Tolerant Maize

Albajes¹,

Lumbierres²,

Pons³

et al. 2014

JAS

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Genetically modified maize tolerant to broad-spectrum herbicides may greatly alter weed flora composition, abundance and therefore affect organisms of higher trophic levels, including herbivore and detritivore arthropods and their natural enemies. This three-year study measured the effects on arthropods of an intensive use of broad-spectrum herbicides in comparison with one application of conventional pre-emergence herbicide. Numbers of arthropods were measured by three techniques: visual counts on plants, catches in pitfall and yellow sticky traps. Weed density was much higher in conventional treatment in the first year, showed significant difference in the second year, but was no significant difference in the third year. Counts of arthropod taxa were significantly different only in the first year in the two kinds of weed management systems. In visual counts Cicadellidae and Aphididae among herbivores, the two main generalist predators, Orius spp. and Araneae, and the family Coccinellidae were more abundant on plants treated twice with glyphosate. In pitfall there were higher records in glyphosate-treated plots for Myriapoda but the opposite was seen for Carabidae counts. The yellow sticky traps catches were higher in the glyphosate-treated plots for Cicadellidae and Mymaridae, and lower for Thysanoptera. Most of the significant differences found between herbicide regimes disappeared when abundances of weeds (monocotyledons and dicotyledons) were introduced into the analysis as covariates; this finding signals weed abundance as the main cause of arthropod abundance alteration. However, only a drastic alteration of weed abundance causes significant changes in arthropod densities.

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Benefits of a maize–bean–weeds mixed cropping system in Urubamba Valley, Peruvian Andes

Cited by 28 publications

References 32 publications

Effect of within-species plant genotype mixing on habitat preference of a polyphagous insect predator

Effect of within-species plant genotype mixing on habitat preference of a polyphagous insect predator

Agroecosystem management and biotic interactions: a review

Changes in Arthropod Fauna From Weed Management Practices in Genetically Modified Herbicide-Tolerant Maize

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