The following viruses were isolated from pepper crops in Umbria: AMV, CMV, PVY, TMV, TRV. The virus found more frequently was CMV: an unusual isolate of CMV was found near the Trasimeno Lake, i n pepper fruits, showing necrotic symptoms. In the same area, TRV showed high incidences; it was also detected in the Alta Valle del Tevere and, in both these areas, it was associated with its vector Trichodorus viruliferus. PVY was isolated i n a few cases. TMV was frequently detected in the cvs "Cuneo" and "Quadrato" but never in the resistant pepper 'Yolo Wonder'. AMV was widespread though it occurred in moderate incidences. The presence of very early AMV infections were suggestive of virus transmission by the pepper seeds but this could not be demonstrated experimentally. In the Alta Valle del Teverer where the cv 'Yolo' is prevalent , the incidences of virus infections were considerably lower than in the other surveyed areas (Trasimeno Lake, Valle Umbra and Media Valle del Tevere), where cvs 'Cuneo' and 'Quadrato' predominate.
Nelle coltivazioni umbre di peperone è stata accertata lapresenza dei seguenti virus patogeni: AMV, CMV, PVY, TMV, TRV. Il virus più diffuso è risultato CMV di cui, nella zona del Trasimeno, si è rinvenuto un isolato particolarmente virulento in bacche di peperone con gravi sintomi necrotici . Nella stessa zona sono state rilevate incidenze preoccupanti di TRV, presente, peraltro, anche nell'Alta Valle del Tevere; in entrambi i casi il virus era associato al nematode vettore Trichodorus viruliferus. PVY è stato isolato raramente, mentre TMV è comparso soltanto sulle cvv 'Cuneo' e 'Quadrato d'Asti' , sempre però con incidegze elevate. AMV è risultato ampiamente diffuso, sia pure con modeste percentuali d'infezione, presentandosi anche in attacchi molto precoci che ne fanno sospettare la trasmissione per seme. Nell'Alta Valle del Tevere, dove si coltiva in prevalenza 'Yolo Wonder', le incidenze complessive delle virosi sono apparse sensibilmente più basse che nelle altre zone considerate (Trasimeno, Valle Umbra, Media Valle del Tevere), i n cui sono più diffusi 'Cuneo' e 'Quadrato d'Asti' .
Indagini su virus e virosi del peperone in Umbria.
CACIAGLI P;CONTI;
1982
Abstract
The following viruses were isolated from pepper crops in Umbria: AMV, CMV, PVY, TMV, TRV. The virus found more frequently was CMV: an unusual isolate of CMV was found near the Trasimeno Lake, i n pepper fruits, showing necrotic symptoms. In the same area, TRV showed high incidences; it was also detected in the Alta Valle del Tevere and, in both these areas, it was associated with its vector Trichodorus viruliferus. PVY was isolated i n a few cases. TMV was frequently detected in the cvs "Cuneo" and "Quadrato" but never in the resistant pepper 'Yolo Wonder'. AMV was widespread though it occurred in moderate incidences. The presence of very early AMV infections were suggestive of virus transmission by the pepper seeds but this could not be demonstrated experimentally. In the Alta Valle del Teverer where the cv 'Yolo' is prevalent , the incidences of virus infections were considerably lower than in the other surveyed areas (Trasimeno Lake, Valle Umbra and Media Valle del Tevere), where cvs 'Cuneo' and 'Quadrato' predominate.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
