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First report of Melon necrotic spot virus in melon plantations in Brazil.

Moura, M. C. F. ; Holanda, I. S. A. ; Júnior, R. S. ; Queiroz, A. P. O. ; Araújo, E. O. A. ; Oliveira, G. D. C. ; Nunes, G. H. S. ; Nagata, T. ; Negreiros, A. M. P.

Plant Disease 2018 Vol 102 No. 5 pp. 1048-2048;

Abstract

Melon necrotic spot virus (MNSV) is a carmovirus that causes necrotic spots on melon plants and is transmitted by fungi of the genus Olpidium. In Brazil, the major melon fields are located in the states of Rio Grande do Norte (RN) and Cear√° (CE). Different types of virus-like symptoms (necrotic streaks at the base of the stem and vine decline) were observed in commercial fields and infection by MNSV was suspected by symptomatology. To determine the presence of MNSV, soil samples were collected from 10 commercial fields with MNSV-like symptoms from both states in 2012. The soil samples were sieved and subsequently used for planting yellow-skin melon (cv. Goldex, a major cultivar in the region). Seedlings were planted in a plastic pot containing a mixture of the collected soils in addition to autoclaved sand (1:10 soil/sand ratio), and were maintained for 30 days in the greenhouse. Although the seedlings did not present any symptoms of MNSV, RT-PCR confirmed the presence of MNSV in five out of 30 samples in three out of 10 commercial melon fields. This is thought to be the first report of the occurrence of MNSV in Brazil.