Mitigating the Threat of Pvy: Understanding and Exploiting the Biological and Epidemiological Factors Behind the Increasing Incidence of PVY
This research project applies a multidisciplinary approach towards developing an IPM-program to mitigate the PVY negative impact in potato by determining the vector-virus strains relations and developing a symptom reaction list of cultivars for the US potato industry. PVY, the most economically important potato virus in North America, causes severe economic losses to growers due to yield and tuber quality reduction. Seed growers have suffered rejection of over 50% of seed lots that are used as stock to recertify the following year. New PVY strains that cause tuber necrotic rings have increased the economic losses. Seed certification programs base cultural virus management in roguing diseased plants showing symptoms. However, some preferred cultivars in the U.S. display mild symptoms when infected with PVY necrotic strains, thus nullifying the
effectiveness of roguing as a management strategy. Currently available insecticides are not effective, since the aphid vectors require only a few seconds of probing for acquisition and transmission of PVY. This project will a) study the reasons for the increased incidence of necrotic strains; and b) determine the effect and symptoms of necrotic strains in new and soon to be released potato cultivars. A list of cultivar-PVY reactions (foliar and tuber) determined by this research will be provided to the US potato industry to help in choosing cultivars that are resistant and/or have good foliar symptom expression allowing them to be rogued effectively. This list will be integrated in an improved multidimensional IPM program to reduce PVY in the PNW and consequently improve profitability for all potato growers.