Anthracnose in olives: symptoms, disease cycle and management

Anthracnose in olives: symptoms, disease cycle and management

V. Sergeeva | View Article Anthracnose, caused by the fungi Colletotrichum acutatum and C. gloeosporioides, is a widespread and severe disease in most olive-growing countries, causing significant yield losses, poor fruit and oil quality. The disease incidence depends on olive variety, environment and virulence of the pathogen among other factors. Warm, rainy, misty and humid conditions or heavy dews have been observed to be associated with severe anthracnose epidemics. The disease may affect up to 80% of olives in susceptible cultivars such as ‘Barnea’ and ‘Manzanillo’ in...
Cherry leafroll virus: Impact on olive fruit and virgin olive oil quality

Cherry leafroll virus: Impact on olive fruit and virgin olive oil quality

Sara Godena, Alessandra Bendini, Elisa Giambanelli, Lorenzo Cerretani, Damir Ðermic´ and Edyta Ðermic | View Article We performed a survey on the yield, quality, and chemical characteristics of virgin olive oils from two olive varieties in Croatian Istria: Frantoio and Ascolana tenera, on Cherry leafroll virus-infected and virusnoninfected trees and on two harvest dates. Free acidity, peroxide value, specific spectrophotometric absorptions at 232 and 270 nm, fatty acid composition, total phenols, o-diphenols, oil color, and pigments were determined. Infected olives had lower oil yield and maturity index versus healthy ones. Oils from infected fruits had significant lower value of K232 and K270 and very elevated total phenols content compared to those obtained from healthy...
The distinctive population structure of Colletotrichum species associated with olive anthracnose

The distinctive population structure of Colletotrichum species associated with olive anthracnose

Pedro Talhinhas, Joa˜o Neves-Martins, Helena Oliveira & Surapareddy Sreenivasaprasad | View Article Anthracnose (Colletotrichum spp.) is an important disease of olive fruits. Diversity and biogeographic relationships of the olive anthracnose pathogens in the Algarve (Portugal) were investigated, along with host association patterns and disease levels during 2004–2007, to test the hypothesis that this region is a host–pathogen diversity hot...
Root Rot Disease of Olive Transplants and its Biological Control

Root Rot Disease of Olive Transplants and its Biological Control

Mousa, M.S., M.K. Ali, A.A Mosa and I.S. Elewa | View Article Several nurseries of olives in Fayoum and Giza were surveyed for root rot incidence during early summer of 2003. In Fayoum, root rot incidence reached 53% while in Giza, disease incidence was 44%. Disease symptoms consist of partial wilting, leaves browning and twig dieback, which was associated with severe root rot and basal stem cankers and followed, in most cases, by plant decline and...
El Repilo Del Olivo y Del Acebuche

El Repilo Del Olivo y Del Acebuche

Roca, L.F.; Navarro, N.; Viruega, J.R.; López-Doncel, L.M.; Segura, R.; Alsalimiya, M. y Trapero, A. | View Article Presencia sobre el haz de las hojas de manchas circulares de tamano variable y de color oscuro, con frecuencia rodeados de un halo amarillo caracteristico. El color oscuro de las manchas se aebe al crecimiento del patogeno en la cuticula de la hoja formando un estroma del que emergen al exterior las celulas conidiogenas y conidios...
Nectria Haematococca Causing Root Rot in Olive Greenhouse Plants

Nectria Haematococca Causing Root Rot in Olive Greenhouse Plants

BARRETO, D. BABBITT, S. GALLY, M. PÉREZ, B. A. | View Article This is the first report of Nectria haematococca Berk. & Br. in Argentina. It was isolated from 8 to 12 month greenhouse olive Olea europaea L. plants. The anamorph, Fusarium solani (Mart.) Sacc., was frequently isolated while the teleomorph was rare in culture. Perithecia developed on plated olive root segments and around the PDA medium. Two isolates of F. solani produced orange perithecia, which remained immature for several months. A third isolate developed perithecia containing asci with 2-cell light brown and longitudinally striated ascospores, at maturity. Young olive plants inoculated with F. solani showed leaf browning, root rot, wilting and plant death. Controls remained healthy. The presence of the sexual stage is responsible for the genetic variability of this...