Coffee leaf volatiles and egg laying by the coffee leaf miner Leucoptera coffeella

Magalhães, S.T.V.; Guedes, Raul Narciso C.; Lima, Eraldo; Demuner, Antônio J.

doi:10.1016/j.cropro.2007.12.005

Cited by 14 publications

(8 citation statements)

References 10 publications

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“…Calatayud et al (1994) veriÞed the deterrent effect of caffeine over the cochineal Phenacoccus manihoti Matile-Ferrero (Hemiptera: Pseudococcidae) in cassavas plants as did Dreyer and Jones (1981) for Schizaphis graminum (Rondani) and Myzus persicae (Sulzer). In coffee, caffeine is not associated with resistance against L. coffeella Gué rin-Mé neville, or the curculionid Hypothenemus hampei Wood &Bright (Guerreiro Filho andMazzafera 2000, 2003), although this alkaloid and other phenolics may play other roles in the interaction between coffee plants and their herbivorous insects (Magalhães et al 2008;2010). SpeciÞcally for C. viridis, chlorogenic acid and caffeine seem to affect this generalist insect by stimulating the locomotion of crawlers, thus reducing their feeding, as we observed in our tests.…”

Section: Discussionmentioning

confidence: 98%

“…The HPLC also was equipped with a Shimadzu CBM-10A communication system. The compounds of interest were separated with a RP-18 reverse phase column (Lichrosorb: 250 mm by 4.6 mm by 5 mm) using a methanol:water solution with 1.0 mM HCl in elution gradient 0.1Ð7.0 min (17:83%), 7.1Ð37.0 min (23:77%), and 37.1Ð 40.0 min (100:0%), at a ßow rate of 1.0 ml min Ϫ1 following Magalhães et al (2008). The chemical standards were injected individually into the column and also injected together for determining the retention time.…”

Section: Determination Of the Phytochemical And Nutrient Contents In mentioning

confidence: 99%

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The Effects of Nutrients and Secondary Compounds of Coffea arabica on the Behavior and Development of Coccus viridis

Fernandes¹,

Picanço²,

Queiroz³

et al. 2012

env. entom.

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Phytochemicals may modify the food quality, reduce a plant's palatability to insects, or defend against pests. This work aimed to study 1) relationships between the nitrogen and potassium levels given to plants in nutritive solutions and the foliar phytochemical concentrations, 2) the effect of nutrients and secondary compounds of Coffea arabica on the behavior of Coccus viridis, and 3) tolerance of C. arabica to losses. Deficient, normal, and excessive nitrogen and potassium fertilization treatments were used. Each treatment had two plants (one infested and one noninfested plant). The contents of phytochemicals in the infested plants' leaves and their dry matter of roots, stems, and leaves as well as the total contents in noninfested plants, were determined. The adults and nymphs of C. viridis were counted for 60 d in all treatments. It was verified that elevated nitrogen and potassium levels in the nutritional solutions led to increased of nymphs and adults of C. viridis to the coffee plants over time. Potassium and nitrogen had both direct and indirect effects on C. viridis. The direct effect was because of the increase of the nitrogen content in the leaves. The indirect effect instead was because of reductions in the caffeine and chlorogenic acid contents in the leaves. This is the first study to show relationship nutrient levels of coffee phytochemicals in response to herbivory by scale insects. Caffeine and chlorogenic acid applied on coffee leaves stimulated the locomotory activity of the green scale, thus reducing their feeding compared with untreated leaves. The elevation of caffeine and chlorogenic acid levels in coffee leaves affect this generalist insect by stimulating the locomotion of crawlers.

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Section: Discussionmentioning

confidence: 98%

Section: Determination Of the Phytochemical And Nutrient Contents In mentioning

confidence: 99%

The Effects of Nutrients and Secondary Compounds of Coffea arabica on the Behavior and Development of Coccus viridis

Fernandes¹,

Picanço²,

Queiroz³

et al. 2012

env. entom.

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“…We found that heterospecific neighbours, especially unrelated ones, affect the per cent leaves attacked and patterns of aggregation, but not the density of leaf mines. Since leaf-miners can have significant effects on plant fitness (Magalhães et al 2008, Wagner et al 2008 our findings suggest that if predation and parasitism pressures are higher in aggregated populations, it could lead to higher plant performance in heterospecific stands. Given the importance of aggregation in tritrophic interactions (Gripenberg & Roslin 2008, Whitham 1983, these results suggest that future work should examine if and how herbivore dispersion contributes to associational resistance in this and other systems.…”

mentioning

confidence: 87%

“…Since leaf-miners can have significant effects on plant fitness (Magalhães et al . 2008, Wagner et al . 2008) our findings suggest that if predation and parasitism pressures are higher in aggregated populations, it could lead to higher plant performance in heterospecific stands.…”

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confidence: 99%

Associational resistance to a tropical leaf-miner: does neighbour identity matter?

Orians

Björkman

2009

J. Trop. Ecol.

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Associational resistance occurs when host plants experience reduced attack when in the presence of other plant species (Atsatt & O'Dowd 1976, Tahvanainen & Root 1972). The issue is most studied in agriculture and forestry because of the potential benefits to pest control (Andow 1991, Brown & Ewel 1987, Tahvanainen & Root 1972), but recent research indicates that associational resistance may be relatively common in natural systems as well (Hjältén et al. 1993, Karban 2007, Vehviläinen et al. 2007, Wise et al. 2009; but see Östergård & Ehrlén 2005, White & Whitham 2000), especially against specialist herbivores (Hambäck et al. 2000, 2003; Stenberg et al. 2007).

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“…). Além da água, outras substâncias voláteis presentes nas folhas de café são eliminadas, conformeMagalhães et al (2008), que destacam: Society and Development, v. 9, n. 7, e429974598, 2020 (CC BY 4.0) | ISSN 2525-3409 | DOI: http://dx.doi.org/10.33448/rsd-v9i7.4598Figura 4. Sequência de secagem de uma folha: a) folha fresca; b) em secagem a 40 °C; c) em secagem a 60 °C; d) em secagem a 80 °C, e e) em secagem a 105 °C.…”

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Inativação enzimática de folhas de café para uso em bebidas

Cavallaro

Bucek

Finzer

2020

RSD

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In the processing of vegetable leaves, for the preparation of beverages, enzymatic inactivation is necessary to eliminate the characteristic taste of green leaves. The objective of this work was to study the roasting of coffee leaves, in order to inactivate the enzymes, aiming to obtain a drink in the tea category. The enzymatic inactivation was carried out, in a rotating roaster, at different temperatures (60-100°C), and at different times (30-180s). The drying equilibrium curve was performed on 30 sheets, at different temperatures (40-105°C), in a forced air circulation oven. The effective diffusivity, according to Fick's Law, was calculated for temperatures 60-100°C. To inactivate the enzymes and obtain a drink, it is recommended that the leaves are roasted, at temperatures above 80°C, with a minimum time of 80s.

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Coffee leaf volatiles and egg laying by the coffee leaf miner Leucoptera coffeella

Cited by 14 publications

References 10 publications

The Effects of Nutrients and Secondary Compounds of <I>Coffea arabica</I> on the Behavior and Development of <I>Coccus viridis</I>

The Effects of Nutrients and Secondary Compounds of <I>Coffea arabica</I> on the Behavior and Development of <I>Coccus viridis</I>

Associational resistance to a tropical leaf-miner: does neighbour identity matter?

Inativação enzimática de folhas de café para uso em bebidas

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