Early selection for growth vigor in rubber  tree genotypes in northwestern São  Paulo State (Brazil)

Forty-five genotypes (clones) of rubber tree [Hevea brasiliensis (Willd. ex Adr. de Juss.) Müell. Arg.] of different origins were assessed for efficiency of early selection at the Votuporanga Experimental Station in northwestern São Paulo State, Brazil, using a randomized complete block design with three replications and six plants per plot. Girth at 120 cm above the highest point of the grafting union of each tree was taken at ages 12, 24, 36, 48, 60, 72, 84 and 96 months. Highly significant differences in girth were detected among the genotypes at all ages evaluated, except for 12 months. Estimates of genetic variance for two age sets showed a substantial increase with age, while the genotype variation decreased. Selection made at 24 months proved to be the most efficient, giving a superior gain per unit of time.

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Age-age correlation for early selection of rubber tree genotypes in São Paulo State, Brazil

Genetics and Molecular Biology ◽

10.1590/s1415-47572005000500018 ◽

2005 ◽

Vol 28 (4) ◽

pp. 758-764 ◽

Cited By ~ 17

Author(s):

Paulo de Souza Gonçalves ◽

Nelson Bortoletto ◽

Átila Bento Beleti Cardinal ◽

Lígia Regina Lima Gouvêa ◽

Reginaldo Brito da Costa ◽

...

Keyword(s):

Rubber Tree ◽

Sao Paulo ◽

Early Selection ◽

São Paulo ◽

Paulo State ◽

São Paulo State ◽

Selection Of

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Agronomical performance and profitability of exploitation systems in four rubber tree clones in São Paulo state

Bragantia ◽

10.1590/s0006-87052010000400009 ◽

2010 ◽

Vol 69 (4) ◽

pp. 843-854 ◽

Cited By ~ 5

Author(s):

Juliano Quarteroli Silva ◽

Paulo de Souza Gonçalves ◽

João Alexio Scarpare Filho ◽

Reginaldo Brito da Costa

Keyword(s):

Cultural Practices ◽

Block Design ◽

Rubber Tree ◽

Sao Paulo ◽

Production Costs ◽

Total Production ◽

São Paulo ◽

Paulo State ◽

Randomized Block Design ◽

São Paulo State

The exploitation or tapping of the rubber tree, Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell. Arg. is one of the most important cultural practices in determining useful life, yield and accounts for a major part of the total production costs in rubber farming. The objective of this work was to evaluate yield performance and economic aspects of rubber tree clones submitted to diverse tapping systems. The trial was placed in Guararapes city, São Paulo State, Brazil, in a randomized block design with split-plot in time. The plots consisted of the IAN 873, PR 261, RRI M 600 and RRI M 701 clones. The tapping systems consisted the subplots, where: ½S = tapping of half spiral cut; d/2, d/3, d/4, d/5 and d/7 = tapping every 2, 3, 4, 5 and 7 days, respectively; 11 m/y = tapping during eleven months per year; ET = ethephon (stimulant); Pa = panel application; La = lace application; 8/y = eight applications per year. The five experimental years were the sub-subplots and the ½S d/2 system was used as control. The analyzed variables were girth, dry rubber yield, tapping panel dryness and economic profitability. The ½S d/3 ET 2.5% and ½S d/4 ET 2.5% tapping systems provide the highest yield and profitability per hectare per year for the RRI M 600 and PR 261 clones. For the IAN 873 and RRI M 701 clones the yield superiority occurs in high tapping frequency; however the best profitability is obtained in the ½S d/7.ET 2.5% system.

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Diversity of citrus gummosis in São Paulo State, Brazil

Summa Phytopathologica ◽

10.1590/0100-5405/2171 ◽

2016 ◽

Vol 42 (3) ◽

pp. 209-215

Author(s):

Alfredo Seiiti Urashima ◽

Tatiane de Fátima Mistura ◽

Cassiara Regina Noventa Correa Bueno Gonçalves

Keyword(s):

Its Region ◽

Sao Paulo ◽

Intraspecific Diversity ◽

São Paulo ◽

Paulo State ◽

São Paulo State ◽

Nursery Trees ◽

Species Specific ◽

Different Origins ◽

Important Disease

ABSTRACT Citrus gummosis is an important disease because it causes the death of young plants, resulting in their replacement, a costly operation. Its causal agents are different species of Phytophthora. Dissemination of these microorganisms occurs mainly by contaminated nursery trees. Differences in aggressiveness, competitiveness and response to fungicides varied among species of this pathogen. Therefore, this study aimed to examine diversity among citrus isolates of Phytophthora from two different origins in São Paulo State. Thirty isolates from citrus nursery trees from 13 municipalities and 11 from seven commercial orchards were analyzed. Interspecific diversity was performed by species-specific primers and sequencing of the ITS region. Subsequently, intraspecific diversity was carried out with 16 RAPD primers and clustering analysis of UPGMA, using the Dice coefficient. Our data identified only P. nicotianae from either substrates or commercial fields. Isolates clustered into two genetically distinct populations. Genetically similar isolates were also found. The existence of these clonal lineages among isolates from geographically distinct nursery trees suggests an efficient dissemination mechanism. This was the first study to examine the diversity of Phytophthora in citrus from substrates of nursery trees in Brazil.

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Evaluation and Monitoring of Natural Rubber Technological Properties of Rubber Tree Clones Recommended for Plantation on the Plateau of São Paulo State, Brazil

Progress in Rubber Plastics and Recycling Technology ◽

10.1177/147776060802400102 ◽

2008 ◽

Vol 24 (1) ◽

pp. 19-31 ◽

Cited By ~ 1

Author(s):

Rogério M. B. Moreno ◽

Paulo S. Gonçalves ◽

Luiz H. C. Mattoso

Keyword(s):

Natural Rubber ◽

Rubber Tree ◽

Sao Paulo ◽

São Paulo ◽

Technological Properties ◽

Paulo State ◽

São Paulo State ◽

Evaluation And Monitoring

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Vigor assessment of juvenile rubber tree clones in Northwestern São Paulo State, Brazil

Revista CERES ◽

10.1590/0034-737x202168060008 ◽

2021 ◽

Vol 68 (6) ◽

pp. 564-568

Author(s):

Elaine Cristine Piffer Gonçalves ◽

Lígia Regina Lima Gouvêa ◽

Antonio Lúcio Mello Martins ◽

Roberto Botelho Ferraz Branco ◽

Paulo de Souza Gonçalves

Keyword(s):

Rubber Tree ◽

Sao Paulo ◽

São Paulo ◽

Paulo State ◽

São Paulo State

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Anuran captured in pitfall traps in three agrossystem in Northwestern São Paulo State, Brazil

Biota Neotropica ◽

10.1590/s1676-06032009000400026 ◽

2009 ◽

Vol 9 (4) ◽

pp. 253-255 ◽

Cited By ~ 4

Author(s):

Fernando Rodrigues da Silva ◽

Rodrigo Souza Santos ◽

Maria Andréia Nunes ◽

Denise de Cerqueira Rossa-Feres

Keyword(s):

Tree Species ◽

Rubber Tree ◽

Sao Paulo ◽

Pitfall Traps ◽

São Paulo ◽

Paulo State ◽

Anuran Species ◽

São Paulo State

Although it is generally assumed that agriculture negatively influences amphibian populations, few studies on the effects of agricultural cultivations on neotropical anuran have been conducted. As a contribution to the knowledge about anuran in agriculture, the present study sought to identify the anuran species present in three different agrossystems. We used data from anurans captured in pitfall traps initially proposed for a survey of harvestmen fauna in three agrossystems (corn, soybean, and rubber tree). Four anuran species found in the pitfall traps belong to two Families: Leptodactylidae: Leptodactulus fuscus and L. mystacinus; and Leiuperidae: Eupemphix nattereri and Physalaemus cuvieri. In corn plantation, four species and 30 individuals were captured; in rubber trees, four species and 11 individuals; and in soybeans plantation, tree species and eight individuals. Our results show that anurans are present in agrossystems, mainly the generalist anuran species.

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