Etiologia do declínio de mangostanzeiros no sul da Bahia

Abstract

CÉLIO KERSUL DO SACRAMENTO 6 RESUMO -O declínio do mangostanzeiro (Garcinia mangostana L.) no litoral sul do Estado da Bahia é hoje o principal problema da cultura, sendo caracterizado por sintomas de murcha, amarelecimento, seca e queda de folhas. Este trabalho teve como objetivo acompanhar a evolução da sintomatologia da doença, isolar e identificar os potenciais patógenos causadores do declínio do mangostanzeiro. A doença começa com a necrose das radículas, a qual atinge as raízes secundárias, primárias e progride até à base do tronco que desenvolve lesões necróticas extensas. Os sintomas secundários são clorose, murcha e queda das folhas. ETIOLOGY OF THE DECLINE OF MANGOSTEEN IN THE SOUTHERN BAHIAABSTRACT -The decline of mangosteen (Garcinia mangostana L.) in the southern coast of the state of Bahia is today the main problem of the culture, being characterized by symptoms of wilting, yellowing, blight and defoliation. This study was aimed to follow the evolution of the symptoms of the disease, isolate and identify the possible pathogen of mangosteen decline. The disease begins in the roots and progresses toward the canopy, leading to plant death. Samples of infected tissue from diseased plants were taken to laboratory where the following fungal species were isolated and identified: Lasiodiplodia theobromae, L. parva, Mycoleptodiscus sp., Rhizopus sp., Stilbella sp., Aspergillus sp. and Trichoderma spp. Only Lasiodiplodia theobromae and L. parva were pathogenic to fragments of roots and stems in vitro and mangosteen seedlings in glass house, being the first species the more virulent. The taxonomy of the genus Lasiodiplodia and some conditions that influence the development of the disease in the field were analyzed.

Fungal and Oomycete Diseases of Minor Tropical Fruit Crops

“…A decline in mangosteen trees was reported on the southern coast of Bahia, Brazil. Infection starts from the roots and spreads to the entire tree, with symptoms of wilting, yellowing, blighting, and defoliation, eventually causing tree death [180]. Two species of Lasiodiplodia, namely Lasiodiplodia theobromae and Lasiodiplodia parva, have been reported to be the causative pathogens of the disease.…”

Identification of the Causal Agent of Sooty Stem and Branches Wilt Disease in Some Trees in Iraq

“…Based on the phenotypic characteristics, several fungi species could be identified and classified belong to Botryosphaeriaceae family (Taylor et al, 2000), as all fungi that are classified with morphological features (Leslie et al, 2006). These fungi species showed a significant genetic variation (Paim et al, 2012).…”

“…The main symptoms include wilted branches of the walnut trees (Wilson, 1947) and apricots (Calavan and Wallace, 1955). Recently, the fungus was classified belong to Botryosphaeriaceae family, which includes several plant pathogens considers as saprophytic and parasitic species that distributed globally with the genetic variations (Slippers and Wingfield, 2007;Paim et al, 2012). As a result of the technology development, we recommend using PCR technique, an accurate and rapid tool, for identifying several plant pathogens, including fungi (Fang and Ramsamy, 2015).…”

Fungos Colonizando Palmeiras Em Áreas De Caatinga Do Sertão Da Bahia

“…Os danos causados por L. theobromae são variáveis em função da espécie da planta parasitada, podendo causar queima das folhas, formação de cancro em caules de espécies arbóreas, podridão dos frutos, tubérculos e raízes, morte do vegetal. Apesar de patogênico, acredita-se que a severidade do fungo está associada a fatores de estresse, como estado nutricional da planta, suprimento de água e condições físicas do solo (Paim, 2010). Lasiodiplodia theobromae foi encontrado colonizando raque de licurizeiro em decomposição e, embora apresente ampla distribuição, a mesma ainda não havia sido documentada em S. coronata.…”