Crescimento de eucalipto sob efeito de desfolhamento artificial

Matrangolo, Carlos Augusto Rodrigues; Castro, Renato Vinícius Oliveira; Lúcia, Terezinha Maria Castro Della; Lucia, Ricardo Marius Della; Mendes, Ana Flávia Neves; Costa, Júlia Melo Franco Neves; Leite, Hélio Garcia

doi:10.1590/s0100-204x2010000900003

Cited by 25 publications

(15 citation statements)

References 16 publications

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“…These results were similar to the first experiments, in which the plants killed by ant attack were 100% defoliated. Approximately 8% of totally defoliated E. grandis plants died (Matrangolo et al, 2010). A study using experimental defoliations that mimicked patterns of attack by Atta spp.…”

Section: Resultsmentioning

confidence: 99%

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Leaf-cutting ant attack in initial pine plantations and growth of defoliated plants

Nickele

Filho²,

Oliveira³

et al. 2012

Pesq. agropec. bras.

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-The objective of this work was to evaluate the natural attack by Acromyrmex crassispinus in initial Pinus taeda plantations without control measures against ants, as well as the effect of defoliation in seedlings of P. taeda. Evaluations of the attack of leaf-cutting ants on P. taeda plantations were done monthly in the first six months, then 9 and 12 months after planting. The percentages of plants that were naturally attacked by ants were registered. The effect of defoliation was evaluated by artificial defoliation, simulating the natural patterns of attack by A. crassispinus on P. taeda seedlings. The natural attack of A. crassispinus was greater during the first months after planting, being more intense in the first 30 days. Artificial defoliation indicated that there were no significant losses in diameter and height in plants with less than 75% defoliation. However, there were significant losses in diameter and height in plants with 100% defoliation, independently of the cut of the apical meristem, and also plant death. The control of leaf-cutting ants in P. taeda plantings, in which A. crassispinus is the most frequent leaf-cutting ant, should be intense only at the beginning of planting, since the most severe attacks occur during this time.Index terms: Acromyrmex crassispinus, Pinus taeda, artificial defoliation, forest pest. Ataque de formigas cortadeiras em plantios iniciais de pinus e crescimento de plantas desfolhadasResumo -O objetivo deste trabalho foi avaliar o ataque natural de Acromyrmex crassispinus em plantios iniciais de Pinus taeda sem controle contra formigas, bem como o efeito da desfolha em mudas de P. taeda. As avaliações do ataque de formigas cortadeiras em plantios de P. taeda foram realizadas mensalmente nos primeiros seis meses, depois aos 9 e 12 meses após o plantio. As percentagens de plantas naturalmente atacadas por formigas foram registradas. O efeito da desfolha foi avaliado por meio do desfolhamento artificial, ao se simularem os ciclos naturais de ataque de A. crassispinus em mudas de P. taeda. O ataque natural de A. crassispinus foi maior nos primeiros meses após o plantio, tendo sido mais intenso durante os primeiros 30 dias. A desfolha artificial indicou que não houve perdas significativas no diâmetro e na altura de plantas com menos de 75% de desfolha. No entanto, observaram-se perdas significativas no diâmetro e na altura de plantas 100% desfolhadas, independentemente do corte da gema apical, e também a morte de plantas. O controle de formigas cortadeiras em plantios de P. taeda, em que A. crassispinus é a formiga cortadeira mais frequente, deve ser intenso somente no início do plantio, pois os ataques mais severos ocorrem neste período.Termos para indexação: Acromyrmex crassispinus, Pinus taeda, desfolha artificial, praga florestal.

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Section: Resultsmentioning

confidence: 99%

“…Plants of E. grandis lost 18.9% in diameter and 12% in height with 100% defoliation (Matrangolo et al, 2010). Plants of E. urophyla lost 16 and 42% of wood volume at 4.6 years with a defoliation of 75 and 100%, respectively (Zanúncio et al, 1999).…”

Section: Resultsmentioning

confidence: 99%

Leaf-cutting ant attack in initial pine plantations and growth of defoliated plants

Nickele

Filho²,

Oliveira³

et al. 2012

Pesq. agropec. bras.

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“…A one-time defoliation reduced the total wood volume by 37.9% and three defoliations reduced the total volume by 79.7% [20].…”

Section: Damage By Leaf-cutting Antsmentioning

confidence: 94%

“…A complete defoliation reduced the growth in Eucalyptus grandis [20], whereas two consecutive ones resulted in tree death [21]. After three years of age, Eucalyptus trees can die if they experience three consecutive total defoliations [22].…”

Section: Damage By Leaf-cutting Antsmentioning

confidence: 99%

An Overview of Integrated Management of Leaf-Cutting Ants (Hymenoptera: Formicidae) in Brazilian Forest Plantations

Zanetti

Zanúncio

Santos

et al. 2014

Forests

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Brazilian forest producers have developed integrated management programs to increase the effectiveness of the control of leaf-cutting ants of the genera Atta and Acromyrmex. These measures reduced the costs and quantity of insecticides used in the plantations. Such integrated management programs are based on monitoring the ant nests, as well as the need and timing of the control methods. Chemical control employing baits is the most commonly used method, however, biological, mechanical and cultural control methods, besides plant resistance, can reduce the quantity of chemicals applied in the plantations.

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“…Vários autores apresentaram métodos para testar hipóteses relativas à identidade de modelos lineares e não lineares, como por exemplo, Chow (1960), Graybill (1976), Regazzi (1993Regazzi ( , 1999Regazzi ( , 2003, Dette e Neumeyer (2001), Leite e Oliveira (2002), entre outros. Testes de identidade de modelos são rotineiramente aplicados em estudos do gênero Eucalyptus, destacando-se os trabalhos de Nogueira et al (2005), Thiersch et al (2006), Matrangolo et al (2010), Soares et al (2010), Martins et al (2015), Mota et al (2015), Miranda et al (2015), entre outros.…”

Section: Introductionunclassified

Testes de identidade de modelos aplicados na construção de curvas de índices de local e na produção de povoamentos de Eucalyptus grandis

Roveda¹,

Dias²,

Filho³

et al. 2016

Sci. For.

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ResumoEste trabalho teve como objetivo aplicar testes de identidade de modelos na construção de curvas de índi-ces de local e na produção da área basal e do volume por hectare em povoamentos de Eucalyptus grandis W. Hill. Ex. Maiden para seis fazendas de uma região do estado de São Paulo. O teste de Regazzi (2003) foi aplicado para analisar a possibilidade de utilização de um único modelo de altura dominante para todas as fazendas. A curva média de produção em área basal e volume ajustada pelo modelo de Clutter (1963) foi projetada para o índice de local médio e aplicado o teste de identidade de modelos, por meio do teste de Chow (1960). Uma única equação não é suficiente para representar o crescimento da altura dominante para as seis fazendas. Ao aplicar o teste separadamente entre as fazendas observou-se que os dados de algumas delas podem ser agrupadas, sem perda de precisão. Com as projeções do modelo de Clutter (1963), o teste de Chow (1960) indicou que algumas fazendas podem ser agrupadas e outras não deveriam ser agrupadas em termos de produção de área basal e volume.Palavras-chave: crescimento, parcelas permanentes, comparação de curvas, manejo florestal. AbstractThis study aimed to apply identity model tests in the construction of site index and on the production of basal area and volume per hectare in stands of Eucalyptus grandis W. Hill. Ex Maiden growing in six farms in Western São Paulo State. The Ragazzi test (2003) was applied to analyze the possibility of using a single model for dominant height for all farms. The average production curve in basal area and volume was adjusted by the Clutter (1963) model and projected for the mean local index, and the model identity test was applied through the Chow test (1960). A single equation is not efficient to represent the dominant height growth for the six farms. When applying the test, separately between the farms, we observed that some of the data may be grouped without loss of accuracy. With the projections of the Clutter model (1963), the Chow test (1960) indicated that some farms can be grouped and others should not be grouped for volume and basal area production.

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Crescimento de eucalipto sob efeito de desfolhamento artificial

Cited by 25 publications

References 16 publications

Leaf-cutting ant attack in initial pine plantations and growth of defoliated plants

Leaf-cutting ant attack in initial pine plantations and growth of defoliated plants

An Overview of Integrated Management of Leaf-Cutting Ants (Hymenoptera: Formicidae) in Brazilian Forest Plantations

Testes de identidade de modelos aplicados na construção de curvas de índices de local e na produção de povoamentos de Eucalyptus grandis

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