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Marília, Brazil

Bernardes M.S.,University of Sao Paulo | Martins A.N.,APTA Centro Oeste
Summa Phytopathologica | Year: 2015

The pathogenicity of Pratylenchus brachyurus to rubber (Hevea brasiliensis) rootstocks was studied in two experiments: 1) opencross seedlings of ‘Tjir 1’ x ‘Tjir 16’ were inoculated with zero, 7,700 or 23,100 nematodes per plant; 2) illegitimate seedlings of ‘GT 1’, ‘RRIM 527’ and ‘RRIM 600’ were inoculated with zero or 12,800 nematodes per plant. After 195 (1st experiment) or 105 days after inoculation (2nd experiment), P. brachyurus did not affect the relative growth percentage in terms of plant height in both experiments but significantly diminished the stem diameter percentage and increased the stomatal resistance of ‘GT 1’ , ‘RRIM 527’ and ‘RRIM 600’. © 2015 Universidade Estadual Paulista (UNESP). All rights reserved. Source

Martins A.N.,APTA Medio Paranapanema | Furlaneto F.P.B.,APTA Centro Oeste | Dias N.M.S.,University of Sao Paulo | Suguino E.,APTA Centro Leste
Revista Brasileira de Fruticultura | Year: 2010

Brazil is in the fourth ranking position in the banana producing countries. The state of Sao Paulo accounts for approximately 17% of the national production. The areas of banana production, but restricted to the coastal strip of the state, are expanding and occupying regions of the Sao Paulo plateau. To achieve high yields, with fruit quality of banana, growers are adopting new technologies and the fertirrigation has been occupying a prominent place in the new production systems. In order to assess the economic viability of the use of potassium in different doses (0; 300; 600 e 900 kg K2O.ha-1.ano-1) in experimental planting in the Middle Paranapanema, in the state of São Paulo, were estimated values of the production cost and economic indicators, such as Total Operating Cost (TOC), Net Revenue and Profitability Index, of systems fertirrigated in the banana crop. According to the methodology, the use of potassium in dose of 900 kg K2O.ha-1.ano-1, applied through fertirrigation system can be recommended for banana planting, 'Willians' cultivar, in the Middle Paranapanema, state of Sao Paulo. Source

Soares-Colletti A.R.,University of Sao Paulo | Fischer I.H.,APTA Centro Oeste
Australasian Plant Pathology | Year: 2015

A survey conducted in SP state in 2005 and another in 2007 found that black spot (Guignardia psidii) incidence on guava reached 58 %. The aim of this study was to investigate the effects of temperature and wetness duration on the development of black spot symptoms in detached guava naturally infected under controlled conditions. Guava fruit cv. Kumagai from a production field with a history of occurrence of the disease were subjected to different temperatures (10, 15, 20, 25, 30 and 35 °C) with wetness periods of 6 and 24 h. Analyses of variance and nonlinear regression were employed to evaluate the combined effects of temperature and wetness duration on the disease incidence, the final disease severity, the rate of disease progression and incubation period. Black spot symptoms were observed at all temperatures, except at 10 and 35 °C. The first symptoms of black spot in guavas were observed 2 days after incubation at 25 and 30 °C with wetness duration of 6 h. All variables reached their maximum values close to 30 °C, regardless of wetness duration. This temperature combined with 24 h of wetness duration resulted in black spot incidence of 100 %, disease severity of 3.02 cm, progress rate of 6.9 mm/day and incubation period of 6 days, 10 days after incubation. The postharvest storage of fruits at 10 °C and other control methods based on low or high temperature can delay the black spot incidence on ‘Kumagai’ guavas and prolong the fruit shelf life. © 2015, Australasian Plant Pathology Society Inc. Source

Camolesi M.R.,Laboratorio SGS | Neves C.S.V.J.,State University Londrina | Martins A.N.,APTA Centro Oeste | Suguino E.,APTA Centro Leste
Semina:Ciencias Agrarias | Year: 2012

The banana crop is considered an economic alternative for farmers of the Médio Paranapanema region, in the Planalto Paulista, Brazil. This study aimed to identify banana plants genotypes adapted to local soil and climatic conditions. The experimental area was installed in the municipality of Palmital, SP, with plantlets of nine cultivars: Caipira, Thap Maeo, Prata Zulu, Preciosa, Maravilha, PV 4253, Nanicão IAC 2001, Nanicão Jangada and Grande Naine. Vegetative and reproductive parameters of the plants were evaluated, besides the characteristics of the fruits. The genotypes belonging to Cavendish subgroup showed better vegetative and productive results, with emphasis for 'Nanicao Jangada' that had the best performance for the most production characters evaluated. The cultivars Prata Zulu and Thap Maeo had results similar to Nanicão IAC 2001 cultivated in the region, and can be an alternative crop since they have resistance to yellow and black sigatokas, major diseases of the crop. The genotypes Maravilha and PV4253 showed to be promising for the region, and need to be evaluated further in subsequent cycles. Source

Martins A.N.,APTA Centro Oeste | Suguino E.,APTA Centro Oeste | Hashimoto J.M.,ITAL | Narita N.,APTA Alta Sorocabana
Revista Brasileira de Fruticultura | Year: 2011

The application of nutrients through irrigation water increases their efficiency of utilization by plants. The objective of this study was to evaluate the effects of potassium fertilization and irrigation on the yield and fruit quality of banana cv. Willians, in the Médio Paranapanema Region, São Paulo. Four water regimes were evaluated: rainfed, 0.7 of the reference evapotranspiration (ETo), 1.4 ETo and 2.1 ETo, combined with four doses of potassium: 0, 300, 600 and 900 kg ha year-1 K2O, applied weekly by fertigation. Under rainfed, potassium fertilization was applied during the rainy season, split into four times. Potassium fertigation affects positively both the production and the quality of the fruits of banana cv. Willians. In addition, the fertigation increased nutrient use efficiency when compared to fertilization under rainfed conditions. Source

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