First report of Fusarium lateritium as the agent of nut gray necrosis on hazelnut in Italy.
In early summer of 2000, a severe fruit drop (up to 60%) was observed in several hazelnut orchards located in the Latium Region in central Italy. The severity of yield losses resulted in the investigation of the aetiology of the disease subsequently named nut gray necrosis based on symptoms observed on the affected fruit. Symptoms consisted of a brown grayish necrotic spot/patch on the nut shell and bracts, sometimes involving the petiole. Morphological and molecular analyses identified the pathogen as F. lateritium [Gibberella baccata]. This is thought to be the first report of F. lateritium as the causal agent of nut gray necrosis on hazelnut in Italy, and the first report of the pathogen as an agent of necrosis and drop of hazelnut fruit.