Papaya mosaic virus

Diseases of horticultural crops and their management

1. COLLEGE OF AGRICULTURAL TECHNOLOGY (Affiliated to Tamil Nadu Agricultural University, Coimbatore-3) Kullapuram (Po), ViaVaigai D Papaya mosaic virus STUDENT Miss M.P. HEMAVARSHINI ID. No. 2015021049 COURSE TEACHER Dr. PARTHASARATHY S Asst. Professor (Plant Pathology)

2. Introduction Papaya mosaic virus ( PapMV ) was first reported in papaya in 1962 together with papaya ring spot virus. The viruses were differentiated in 1965 and 1967 using particle lengths and host range.

3. Taxonomic classification Group : IV Order : Tymovirales Family : Alphaflexiviridae Genus : Potex virus Species : Papaya mosaic virus ( PapMV )

4. PapMV It is a filamentous, flexuous rod, 530 nm in length. The virus is a monopartite strand of positive sense, single standard RNA surrounded by a capsid made for a single viral encoded protein.

5. Occurrence and distribution PapMV was occur in South America and USA

6. Synonyms Papaya mosaic potexvirus Babco yellow mosaic virus Boussingaultia mosaic virus

7. Symptoms Mild leaf mosaic pattern with dark green blister like patches. Later stage leaf veins show signs of clearing, petioles are shorter and leaves curl downward. Plants show a moderately stunted growth.

8. Mode of spread and transmission Its spread from plant to plant by whitefly and the disease transmission is through mechanical plant injuries also.

9. Management Rotate with non host crops. Bio fungicides based on Verticillium lecanii can also help to control the insect population. There is no chemical treatment for viral infection. it is controlled through a series of chemical products such as cypermethrin , chlorpyriphos .

10. References http://www.plantwise.org http://agropedia.iitx.ac.in Dr.R.P.singh , Plant Pathology, published by Kalyani publisher, pg.no:644-646 R.S.Singh , Plant diseases published by oxford and IBH publishing.pg.no:440-442

11. Thank you