Papaya ringspot virus
Family : Potyviridae
Genus : Potyvirus
Acronym : PRSV
Introduction
Papaya ringspot virus (PRSV) is an economically important pathogen causing the most devastating disease of papaya world wide including India. There are two major types of this virus that are serologically indistinguishable and are so closely genetically related that they are now considered the same virus species. The type that gave the virus its name are the Type P isolates (PRSV-P). This type infects papaya and several members of the melon family (Cucurbitaceae). The other type, Type W isolates (PRSV-W), does not infect papaya. Isolates of PRSV-W do infect cucurbits such as watermelon, cucumber, and squash and were originally known as Watermelon mosaic virus 1.
Major Diseases
Ringspot Disease
Geographical Distribution
Spreads throughout in India.
Particle Morphology
A virus with RNA-containing, flexuous filamentous particles 750-780 nm long and 11-13 nm wide.
Transmission Method
Transmitted non persistently by numerous species of aphids including Aphis craccivora, A. gossypii, A. citricola, Myzus persicae and Rhopalosiphum maidis.
Detection
DAS ELISA and RT-PCR.
Host Range and Symptomatology
| Host | Symptoms |
| Carica papaya (papaya) | Mottling and malformation of leaves, ringspots and streaking on fruit, stems and petioles, plants stunted with less fruit. |
| Cucurbits (water melon, cucumber and squash) | Mosaic chlorosis, mottling and leaf distortion. |
References
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