Biology
While many viruses infect narcissus, two virus diseases (Yellow Stripe and White Streak) are common in the Pacific Northwest. Yellow Stripe is characterized by the white mottling or streaking of the flower and streaking of the upper 2/3 of the foliage with pale green to yellow stripes. The affected foliage also develops a rough texture and may be stunted or distorted. Yellow Stripe Virus is transmitted by aphids. White Streak is characterized by the appearance of very narrow dark green to purplish stripes on the foliage and flower stems. These later turn white and necrotic. Affected leaves die. White Streak Virus is transmitted by aphids and often appears after periods of high temperature and strong sunlight.
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