Narcissus yellow streak virus[1] Narcissus yellow stripe potyvirus (NYSV) is a plant pathogenic Potyvirus of the family Potyviridae which infects plants of the genus Narcissus.

[2] It is one of the commoner viruses infecting Narcissus, and is transmitted by aphids.

[3] Infection with NYSV produces light or grayish green, or yellow stripes or mottles on the upper two-thirds of the leaf, which may be roughened or twisted.

The flowers which may be smaller than usual may also be streaked or blotched.

[3] Added to the ICTV taxonomy in the 5th report (1991), and the family Potyviridae in 1993.