1a. Objectives (from AD-416)
Identify cultivable plant species that are non-hosts for certain pests and pathogens common in the Pacific Northwest and achieve a measure of control or eradication without use of chemicals.
1b. Approach (from AD-416)
Test different plant species for host range against a panel of pests and diseases of the Pacific Northwest. Hosts should demonstrate egg hatching induction, but lack of successful parasitism and reproductions for nematodes, lack of successful initial inoculation events and propagation in the case of fungi. Successful candidates will be examined for ease of cultivation, flowering, seed production, root mass and rooting depth.
3. Progress Report
The potato cyst nematode is a serious quarantine pest. We surveyed a number of wild potatoes and wild Solanum species as well as the genus Nolana for ability to stimulate hatching. The following list of species showed egg hatching stimulatory activity. S. circaefolium, S. infundibuliforme, S. piurae, S. juglandifolium, S. ochranthum, S. bulbocastanum, S. sitiens, S. lycopersicoides, S. lignicaule, S. agrimonifolium, S. macrocarpum, S. pinnatisectum, S. juglandifolium, S. quitoense. It is already known that S. quitoense is a non-host, so this is a successful identification of egg hatch stimulator non-host. The rest are undergoing a host suitability test. The nematode is presently being controlled by fumigation at a cost of more than 10 million dollars. The growing of a non-host which will not allow reproduction, but will nonetheless reduce egg load in the soil in a dramatic way would be a non-chemical cheaper control measure. This project contribues to objective 1c of the parent project through research in eradicating the potato cyst nematode, defending the Idaho potato industry from inability to export across state lines or to foreign customers. This project is monitored by phone conversations, email communication and visits to the research site.