Abstract
Four species ofTrichodorus have been found in northern Italy, viz.Trichodorus viruliferus, T. teres, T. nanus and an undescribed species. In seven cases tobacco rattle virus (TRV) was isolated from soil samples by means of bait seedlings and in three of these cases the vector was found to beT. viruliferus. The seven virus isolates reacted with an antiserum against a Dutch TRV isolate and were divided into two groups according to their reaction with this serum. One isolate from each group was subjected to a more detailed examination. Of these, one was found to be closely related to a Dutch isolate from gladiolus with notched leaf symptoms, while the other showed a distinct relationship to the pea early-browning virus found in Britain. One of the isolates proved to be more closely related to the Dutch TRV than is the Dutch gladiolus isolate.
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