The Dreaded Potato Leaf Roll Virus

Potato Leaf Roll Virus
Two Potato Plants: One with Potato Leaf Roll Virus (l), the other a normal, healthy plant (r). University of Wisconsin – Madison – Research Photo Collection. Image by Amy Charkowski, Jan 1, 2011. [edited]
Just when you think things are rolling along smoothly, along comes yet another pest infesting your potato crop—the potato leaf roll virus.

In difficult economic times, it is important to protect one’s income and to reduce living costs. I decided to plant a garden! Although I was inclined to plant more expensive vegetable varieties, I included onions, tomatoes, and potatoes. I felt certain these “insurance crops” would guarantee I would experience a bountiful harvest.

Know Thine Enemy

I knew there would be familiar pests I’d have to deal—especially the Colorado potato beetle, but that didn’t worry me too much. To improve savings, I decided to use left over potatoes from my pantry that had developed eyes, rather than buying specially prepared seed-potatoes.

Overconfidence

Not doing my research, I failed to take into account the Potato Leaf Roll Virus (PLRV). As its name suggests, leaf edges of infected plants curl up, yielding unsightly, stunted growth. Unfortunately what occurs above ground suggests underground damage to the tubers themselves.

The major source of spread of this luteovirus is via the green peach aphid. This aphid is plentiful in nature, since not only the potato, but a variety of plants serve as hosts. Besides damaging leaf appearance, photosynthesis is reduced, limiting size and vigor.



I Had to Pay the Piper

Green Peach Aphid spreads Potato Leaf Roll Virus
Green Peach Aphid – Image: USDA
Among those other related host plants are members of the Solanaceae or nightshade family. These include the tomato, eggplant, and bell pepper. Fortunately for eggplant enthusiasts, the fruit itself apparently does not suffer. But of the potatoes I planted, I harvested not one tuber out of three rows!

Good News – Potato Leaf Roll Virus

A bit of good news: genetic modification techniques have led to the discovery of a sequence of DNA that may be utilized to negate the ill-effects of the potato leaf roll virus. Called the orf1/orf2 gene, this promises to afford a reduction in the need of organophosphate treatment.

References: ← Back to Food-Health
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