Atividade de acaricidas sobre o Ácaro-da-leprose, Brevipalpus phoenicis (Geijskes) (Acari: Tenuipalpidae) e sobre artrópodes benéficos na cultura dos citros

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Parâmetros fisiológicos de laranjeiras com Huanglongbing

Pós-graduação em Agronomia (Produção Vegetal) - FCAV

Nutritional balance and yield for green manure orange trees

Intercropping could efficiently prevent soil nutrient losses caused by extensive agriculture. The present study aimed to assess the effect of green manure on the nutritional status of orange trees cultivar 'Pera' (Citrus sinensis (L.) Osbeck). The plants were grafted on 'Cravo' lime trees and were then planted in a 7x4m space. Four different treatments corresponding to the evaluated green manures were employed: jack bean (JB) (Canavalia ensiformis DC), lablab (LL) (Dolichos lablab L.), pigeon pea (PP) (Cajanus cajan L. Millsp), and Brachiaria (BQ) (Brachiaria brizantha Hochst ex A. Rich. Stapf) as control. The experimental design was in randomized blocks, in split-plot time, with six replicates, with four treatments (green manures) and two plants per evaluation. The nutritional status was assessed by using the DRIS method (Diagnosis and Recommendation Integrated System); the yield and the macro and micronutrient levels contained in green manures and in the control was also determined. The nutritional diagnosis indicated that, in the two years of experiment, plants treated with green manure showed better nutritional balance index compared to Brachiaria. This suggests that, over time, green manure can lead to better nutritional balance. Pigeon pea treatment showed the highest yields, compared to control, in the two evaluated crop cycles (2004/05 and 2005/06).

Imagens hiperespectrais no monitoramento da nutrição em citros

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Ajustes de modelos não lineares de efeitos fixos, com ponderação e misto

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

DRIS Norms for Pera Orange

Chemical analysis of leaves is an effective tool for detecting nutritional imbalances and providing data for fertilizer recommendations. Therefore, it is extremely important to establish criteria for interpreting these results. The DRIS (Diagnosis and Recommendation Integrated System) method is an alternative to the interpretation of results of leaf analysis as it allows the calculation of indexes for each nutrient, using its relations with others and comparing them with a reference population. Thus, we aimed to establish preliminary DRIS norms, by both Beaufils's and Jones's methods, and to derive critical levels and nutrient sufficiency ranges in the leaf tissue for Pera orange, by studying a commercial crop in the growing conditions of the Sao Paulo state. The methods (Beaufils and Jones) differed in the limiting nutrients in the Pera orange orchard. The use of regional norms must be prioritized because of differences between the management methods applied. In the methods used, the nutrients that had a greater number of concordant cases in decreasing order: Mn > Mg > B > N > Cu > Fe > Zn > K > P > Ca. Amplitudes related to the DRIS methods used were narrower than the conventional literature.

Uso de cascas de laranja como adsorvente de contaminantes no tratamento de água

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Potencial de resíduos agroindustriais como fontes de compostos bioativos

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Identificação de bactérias do filoplano de citros capazes de interromper o quórum sensing em Xanthomonas citri subsp. citri

Pós-graduação em Microbiologia Agropecuária - FCAV

Infestação da mosca-negra-dos-citros (Aleurocanthus woglumi Ashby) em pomares de citros, em sistemas de plantio convencional e agroflorestal

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Caracterização funcional do mutante da ORF XAC1008 de Xanthomonas citri subsp. citri (Xac)

Pós-graduação em Microbiologia Agropecuária - FCAV

Análise fisico-química e legalidade em bebidas de laranja

The aim of this paper was to measure the total soluble solids content (°Brix), titrable total acidity (AT) and ratio in orange beverages, such as frozen concentrated juice, not from concentrate juice, nectar and soft drink and to compare them with their Quality and Identity Standards (PIQ) published by the Ministry of Agriculture, Livestock and Food Supply (MAPA) and Codex Alimentarius. Four orange frozen concentrated juices, twenty two juices, seven nectars and thirteen orange soft drinks were analyzed. All frozen concentrated orange juices were in agreement with Codex Alimentarius. The majority of not from concentrated orange juices and soft drinks was in accord to Brazilian legislation. The orange nectars could not be compared with the standards because they are not published by MAPA or Codex Alimentarius.

Efeitos das antocianinas, ácidos hidroxinâmicos e vitamina C sobre a biometria, composição corporal e qualidade óssea de ratos Wistar

Pós-graduação em Medicina Veterinária - FCAV

Biologia e tabela de vida de Brevipalpus yothersi (Acari: Tenuipalpidae) oriundos de diferentes regiões citrícolas do Estado de São Paulo

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Histopathology of black spot symptoms in sweet oranges

In Brazil, citrus black spot (CBS) caused by Guignardia citricarpa is a major disease that has different symptoms on fruit. In this study, fruit of Citrus sinensis infected by G. citricarpa and showing the symptoms false melanosis, freckle spot and hard spot were cross-sectioned and analysed anatomically and histochemically by light microscopy. Immuno-histological assays were performed. All symptoms were accompanied by a thickening of the cuticle. False melanosis lesions did not contain pycnidia and remained restricted to the epicarp or to the first layers of the mesocarp. The stomata in this type of lesion showed phenolic compounds in the guard cells and in the sub-stomatal chamber. In some samples, the guard cells and their surrounding cells lysed, and a wound meristem began to form underneath them. Freckle spot and hard spot lesions had very similar histological alterations to the epicarp and mesocarp, but in our samples only hard spot lesions contained pycnidia. Both of these symptoms were accompanied by protein inclusions. Epidermal and sub-epidermal cells located in the oil-gland region were obliterated, causing alterations in these structures. All symptoms had regions that stained strongly for lipids and phenols.