Luciana Melo Sartori Gurgel

Doenças fúngicas pós-colheita em mamões e laranjas comercializados na Central de Abastecimento do Recife

Fungal diseases constitute one of the main causes of losses during commercialization of tropical fruits. Papaya (Carica papaya) and orange (Citrus spp.) fruits were analyzed in relation to the disease incidence and frequency of the pathogenic species for six months, in the Distribution Centre of the city of Recife, Pernambuco, Brazil. Forty fruits of each species were evaluated monthly at five commercialization points, for a total of 200 fruits/month/species. A great diversity of diseases occurred in papaya fruits, where incidences ranged from 39,71% to 0,07%, with the higher level for stem-end rot. In orange fruits the disease incidence was 11,85% and 0,87%, for Lasiodiplodia stem-end rot and antracnose, respectively. The pathogens that presented higher frequencies were Colletotrichum gloeosporioides (44,95%) in papaya and Lasiodiplodia theobromae (11,85%) in orange. The diversity of diseases verified in this study suggests a need for more effective control measures during the production and postharvest phases of papaya and orange, seeking to propitiate reduction of the losses.

Proteção a murcha de fusário do tomateiro com Acibenzolar-S-Metil e Ácido beta-Aminobutírico, em campo

Os elicitores abioticos sao compostos que induzem a sintese de fitoalexinas, como tambem outras respostas de defesa da planta. Visando a obtencao de uma alternativa de controle para murcha de fusario do tomateiro (Lycopersicon esculentum) foram avaliados os indutores Acibenzolar-S-Metil (ASM) e Acido b-Aminobutirico (BABA), em diferentes doses e epocas de aplicacao via foliar. Foram utilizadas as cultivares Viradoro e IPA-6, suscetiveis a raca 1 de Fusarium oxysporum f.sp. lycopersici. A avaliacao de sintomas externos foi realizada semanalmente e a avaliacao final realizada aos 43 dias apos a inoculacao das plantas, atraves da analise de sintomas externo e interno, utilizando-se duas escalas de notas. Apenas na cv. IPA-6 houve reducao no indice de doenca no tratamento com BABA na maior dose, aplicado cinco dias antes da inoculacao.

Doenças fúngicas em cultivos de plantas ornamentais temperadas da região Agreste do Estado de Pernambuco, Brasil

This study aimed to evaluate genetic variability using the internal transcribed spacer (ITS) region of ribosomal DNA (rDNA) and the phylogeny of five Beauveria bassiana: IPA145, IPA148, IPA223, IPA225 and IPA226, obtained from different hosts and geographical origin from the Biological Control Laboratory of the Agronomic Institute of Pernambuco - IPA. The ITS region was amplified using primers ITS1 and ITS4, where an amplicon with average size of 800 bp was observed and sequenced. The DNA sequences of Beauveria isolates were compared with sequences in the database (GenBank). The results show that all isolates, except IPA145, were presented as a monophyletic group. IPA145 showed a genetic identity of 99% with Cordyceps bassiana and B. bassiana. IPA148 was the most genetically distant from the others, with less than 40% similarity. Most of the Beauveria isolates studied proved to be phylogenetically distinct.