Efeito da redução da superfície foliar sôbre o desenvolvimento de cafeeiros

Magalhães, Antonio Celso Novaes de

doi:10.1590/s0006-87051964000100027

Cited by 9 publications

(4 citation statements)

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“…Coffea (Medina-filho et al, 1977) is one example of plant-insect interaction being negative to the plant. the Coffea species are susceptible to the leafminer Leucoptera coffeella, which is responsible for production losses because the premature leaves fall and there is consequent reduction of the photossynthetic area (Magalhães, 1964). in Vismia guianensis, the damage caused by the miners could be considerably low due to the photosynthetic area being lost which is less than 25% of the total area, in general.…”

Section: Discussionmentioning

confidence: 99%

Morphology and anatomy of a leaf mine in Vismia guianensis (Aubl.) Choisy (Clusiaceae) in a fragment of Brazilian Atlantic forest

Almeida-Cortez

Melo-de-Pinna

2006

Braz. J. Biol.

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Mines or hyponomes are channels caused by larva miners consuming internal plant tissues. these miners live on the leaf and feed from these tissues. leaf mines are usually visible on the exterior of the leaf as serpentine paths, blotches, or other characteristic shapes of discolored tissues. Morphological and structural modifications undergone by mined leaves of Vismia guianensis (aubl.) Choisy are presented here with the purpose of elucidating their structure and to contribute to studies about insect-plant interactions. healthy and mined leaves were harvested from thirty plants and taken to the laboratory. for each branch, the total number of young and mature leaves, the number of leaves with mines and the number of mine per leaf were counted. transverse sections of healthy and mined leaves were obtained to observe the morpho-anatomic aspects. from the 1,438 mature leaves and 379 young leaves analyzed, 214 (14.9%) and 70 (18.5%) were mined, where most of the leaves (67%) presented one mine per leaf. transverse sections of the mine revealed that the larva consumed only mesophyll parenchyma tissue and the epidermis remains intact. there is not a pattern of leaf mining, but the larvae did not consume the druses observed on mesophyll and the vascular tissues of the mid-vein and lateral vein.Keywords: plant anatomy, hyponomes, leaf mine, plant-herbivores interactions, Clusiaceae. RESUMO Morfologia e anatomia da mina foliar de Vismia guianensis (Aubl.) Choisy (Clusiaceae) ocorrente em um fragmento de floresta Atlântica brasileiraMinas ou hiponomas são canais causados pelo consumo de tecidos internos da planta por larvas minadoras que habitam na folha e se alimentam desses tecidos. Minas em folhas são freqüentemente visíveis na folha em forma de serpentina, manchas ou outras formas características de tecido descolorido. Modificações morfológicas e anatômicas causadas por minadores em folhas de Vismia guianensis (aubl.) Choisy são apresentadas neste trabalho, com o objetivo de elucidar a sua estrutura e contribuir com os estudos sobre interação inseto-planta. folhas sadias e minadas de trinta indivíduos foram coletadas e levadas ao laboratório. para cada ramo coletado foram mensurados o número total de folhas jovens e maduras, o número de folhas minadas e o número de minas por folha. secções transversais de folhas sadias e minadas foram obtidas para observar aspectos morfo-anatômicos. das 1.438 folhas maduras e 379 folhas jovens analisadas, 214 (14,9%) e 70 (18,5%) estavam minadas e muitas dessas folhas (67%) apresentavam uma única mina. secções transversais das folhas minadas revelaram que a larva consome apenas tecido parenquimático do mesofilo e a epiderme permanece intacta. não foi observado um padrão das minas 760 alMeida-Cortez, J. s. and Melo-de-pinna, g. f. a.

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Section: Discussionmentioning

confidence: 99%

Morphology and anatomy of a leaf mine in Vismia guianensis (Aubl.) Choisy (Clusiaceae) in a fragment of Brazilian Atlantic forest

Almeida-Cortez

Melo-de-Pinna

2006

Braz. J. Biol.

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“…The necrosed leaf surface reduces photosynthesis (Cibes andPerez, 1957, Walker andQuintana, 1969;Magalhães, 1964), since the flux of water, minerals, and organic matter is impaired (Koronova and De La Vega, 1985). Nevertheless, the loss in production is mainly due to leaf loss (Crowe, 1964), provoked by the increase in the level of ethylene (Souza et al, 1998), principally when the lesions are near the petiole (Notley, 1956).…”

Section: Damage To the Plantsmentioning

confidence: 99%

Coffee leaf miner resistance

Filho

2006

Braz. J. Plant Physiol.

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The coffee leaf miner, Leucoptera coffeella, is a common pest of coffee plantations in Brazil. Though it is effective, chemical control substantially increases the cost of production and constitutes a significant risk for the environment. Resistant coffee cultivars have been and continue being developed through classic and molecular selection techniques. Basic knowledge about the biology of this insect, the damage it causes to the plants, the identification of sources of resistance, the development of efficient selection methods and knowledge about the genetics of resistance have contributed to the efficiency of the ongoing genetic improvement programs. Recently, coffee genomics studies have also promoted an improvement in the efficiency of the development of cultivars resistant to this insect. We present a short review of each of these aspects of the search for resistance.

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“…As lagartas desse lepidóptero se alimentam exclusivamente do parênquima paliçádico (RAMIRO et al, 2004), c a u s a n d o l e s õ e s e p r o v o c a n d o , e m a l t a s infestações, queda acentuada das folhas (CROWE, 1964), reduzindo substancialmente a capacidade fotossintética (CIBES e PEREZ, 1957;WALKER e QUINTANA, 1969) e, por conseqüência, a produção de frutos nas plantas (MAGALHÃES, 1964).…”

Section: O B I C H O -M I N E I R O L E U C O P T E R a C O F F E Eunclassified

Flutuação populacional do bicho-mineiro em cultivares de café arábica resistentes à ferrugem

2005

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A intensidade de infestação pelo bicho-mineiro, Leucoptera coffeella (Guérin-Méneville) (Lepidoptera: Lyonetiidae) foi investigada nas cultivares Obatã IAC 1669-20 e Tupi IAC 1669-33, com resistência à ferrugem das folhas do cafeeiro, Hemileia vastatrix Berk. et Br., e Ouro Verde Amarelo IAC 4397, suscetível à doença, em ensaios de campo, localizados em Campinas (SP), Brasil. A incidência de ferrugem e a ocorrência de inimigos naturais da praga, assim como o enfolhamento das plantas, foram também observados nas três cultivares. As curvas de flutuação populacional obtidas para Obatã IAC 1669-20 e Tupi IAC 1669-33 revelaram maior incidência do bicho-mineiro entre abril e novembro. Já na cultivar Ouro Verde Amarelo IAC 4397, observaram-se dois picos de infestação, sendo o primeiro em abril-maio e o segundo em agosto-setembro. No entanto, a elevada percentagem de folhas minadas nas cultivares Tupi IAC 1669-33 e Obatã IAC 1669-20 em relação à Ouro Verde Amarelo IAC 4397 não é evidência de maior suscetibilidade à praga, mas sim devido à maior retenção foliar dessas cultivares, em conseqüência da resistência à ferrugem das folhas observada em ambas. De maneira oposta, na cultivar Ouro Verde Amarelo IAC 4397, os sintomas de ataque do bicho-mineiro ocorreram em menor nível especialmente devido a maior queda de folhas. Com base nas diferenças observadas entre as cultivares, sugere-se a adoção de estratégias distintas de manejo da praga. Palavras-chave:Coffea arabica, Hemileia vastatrix, Leucoptera coffeella, manejo de pragas. ABSTRACT FLUCTUATION OF LEAF MINER POPULATION IN RESISTANT ARABICA COFFEE CULTIVARS TO LEAF RUSTThe intensity of infestation of leaf-miner, Leucoptera coffeella (Guérin-Méneville) was investigated in coffee cultivars Obatã IAC 1669-20 and Tupi IAC 1669-33, both resistant to the leaf rust agent, Hemileia vastatrix Berk. et Br., and Ouro Verde Amarelo IAC 4397, susceptible to this coffee disease, at field assays in Campinas, SP, Brazil. The incidence of coffee rust and presence of natural enemies, as well as the plant leafiness, were also observed. In Obatã IAC 1669-20 and Tupi IAC 1669-33 cultivars the curves of population fluctuation revealed high occurrence of the coffee leaf miner between April and November. However analysis in the Ouro Verde Amarelo IAC 4397 cultivar demonstrated the occurrence of two peaks of infestation, the first in April-May and the second in August-September. Also, a higher index of damaged leaves was observed in Tupi IAC 1669-33 and Obatã IAC 1669-20 cultivars in comparison to Ouro Verde Amarelo IAC 4397. This result may not indicate a higher susceptibility to L. coffeella of those cultivars, but otherwise could be the result of a better leaf retention, as a consequence of the leaf rust resistance exhibited by both cultivars. On the other hand, the damage observed in leaves from Ouro Verde Amarelo IAC 4397 cultivar is less frequent, probably in consequence of the high rate of leaf falling. Based on these observed differences, distinct strategies for this pest management are ...

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Efeito da redução da superfície foliar sôbre o desenvolvimento de cafeeiros

Cited by 9 publications

References 4 publications

Morphology and anatomy of a leaf mine in Vismia guianensis (Aubl.) Choisy (Clusiaceae) in a fragment of Brazilian Atlantic forest

Morphology and anatomy of a leaf mine in Vismia guianensis (Aubl.) Choisy (Clusiaceae) in a fragment of Brazilian Atlantic forest

Coffee leaf miner resistance

Flutuação populacional do bicho-mineiro em cultivares de café arábica resistentes à ferrugem

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