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Occurrence of new rots of olive drupes in Apulia
No full textIn some commercial olive groves of Apulia (southern Italy) the occurrence of
two new rots of olive fruits (Olea europea L.) was recorded in 1997-2000. The first
type of rot was observed on the fruits of cv. Coratina from two orchards in the
province of Bari. Its incidence on mature drupes was as high as 60% in the lower
tree canopy, symptoms consisting of extensive dark-brown discolorations, often
associated with premature falling to the ground. Two different types of
Phytophthora spp. were isolated from the lesions of symptomatic fruits, one of which
was identified as P. nicotianae (Breda) de Haan. Artificial inoculation of drupes with
both colony types reproduced the symptoms after incubation in a moist chamber.
The second type of rot was observed on the fruits of cvs Cellina di Nardò and Mele
collected from several orchards in the province of Taranto. Rot incidence could
reach 20% and symptoms, localised around the pedicel, consisted of shrivelled areas
surrounded by a faint yellow halo. From the lesions, a slow-growing fungus was
consistently isolated which, based on the morphological characteristics of pycnidia,
conidiophores and conidia, was tentatively identified as Pyrenochaeta quercina
Kabát & Bubák. Field symptoms were reproduced by artificial inoculation. This is
the first record of the occurrence of Phytophthora spp and P. quercina on olive
drupes
Shrivelling of olive fruits associated with water stress
No full textThe olive tree (Olea europea L.) is considered one of the species best adapted to the semiarid Mediterranean climate and is traditionally cultivated under rain-fed condition. Nonetheless in certain years persistent drought together with high temperatures may induce water stress. Symptoms of drought during spring and early summer are rare in Southern Italy because of water accumulated in the soil during winter. However, drought symptoms on olive trees have been observed in the last couple of years during autumn, with particular severity in some cultivars and in those orchards that had been irrigated until summer. Symptoms of water stress were present on the leaves and especially on the fruits, which were shrivelled. Possible predisposing factors in relation to cultivars and cultural practices are discussed
Applicazione di agenti di lotta biologica in preraccolta nella lotta contro marciumi di ortofrutticoli in postraccolta
No full textEffectiveness of hypobaric treatment in controlling postharvest rots of strawberry and sweet cherry. Preliminary results
No full textImpact of preharvest application of biocontrol agents on postharvest diseases of fruits and vegetables
No full textTransformation of the postharvest biocontrol agent Metschnikowia pulcherrima with the green fluorescent protein gene, GFP
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