Morphology and phylogeny of Botryosphaeria dothidea causing fruit rot of olives

Morphology and phylogeny of Botryosphaeria dothidea causing fruit rot of olives

A.J.L. Phillips, I.C. Rumbos, A. Alves & A. Correia | View Article The taxonomic position of the causal agent of fruit rot of olives was determined from fresh collections of the fungus from central Greece. In culture it formed two types of conidia, namely fusiform, hyaline, aseptate conidia typical of the genus Fusicoccum, and dark-walled, ovoid, ellipsoid or fusiform, 1–2 septate conidia that are not typically observed in Fusicoccum. A phylogenetic analysis based on ITS and EF1-a sequences placed the fungus within the same clade as Fusicoccum aesculi, which is the anamorph of Botryosphaeria dothidea, and the type of the genus...
Sources of Variation in a Field Evaluation of Olive Leaf Spot

Sources of Variation in a Field Evaluation of Olive Leaf Spot

F.O. Obanor, M. Walter, E.E. Jones and M.V. Jaspers | View Article Incidence (% infected leaves) and severity (number of lesions/leaf) of olive leaf spot disease, caused by Spilocaea oleagina, were assessed every 2 weeks on 20 trees in a Canterbury olive grove for 12 weeks during summer 2003/04. All the trees were infected by olive leaf spot disease (OLS) and although disease incidence and severity varied between trees (P<0.001), it did not vary between branches over time (P=0.088). There was a strong correlation (R2=0.869) between disease incidence and severity. It was estimated that at least fi ve trees and 50 leaves/tree were required to correctly estimate the mean values of the parameters measured. Throughout the duration of the experiment, no new leaf lesions formed and although old lesions increased in size (P<0.001), spore numbers decreased from 5×104 to 1×102 conidia/cm2 of lesion and viability of conidia declined from 55 to...
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...
Macrophomina Phaseolina on Olives

Macrophomina Phaseolina on Olives

V. Sergeeva, L. Tesoriero, R. Spooner-Hart and N. G. Nair | View Article We report the occurrence of Macrophomina phaseolina in roots of olives in Australia. According to the International Code of Botanical Nomenclature, the binomial Macrophomina phaseolina is the valid name for the pycnidial stage of Rhizoctonia bataticola. M. phaseolina has a world-wide distribution and has been reported on a wide range of hosts causing charcoal rot. It causes severe decline of olives in Tunisia (Boulila and Mahjoub 1994), Egypt (Ghoneim et al. 1996), as well as Europe and the Mediterranean region (Sanchez-Hernandez et al. 1996,...