|Mojtahedi, Hassan - WSU-IAREC, PROSSER WA|
|Santo, Gerald - WSU-IAREC, PROSSER WA|
Submitted to: Journal of Nematology
Publication Type: Abstract Only
Publication Acceptance Date: April 15, 1997
Publication Date: N/A
Technical Abstract: Paratrichodorus allius was identified from around roots of various crops including potato in Washington and Oregon. Greenhouse studies showed that P. allius was sensitive to low soil moisture, and increased 1-30 fold on 20 potato cultivars and breeding clones at high moisture levels. The low moisture regime corresponded to those commonly found in commercial potato fields, and is probably why P. allius does not increase on field grown potato. Population dynamic studies on potato showed that P. allius initially declined and remained low throughout the growing season. The population was evenly distributed at 0-90 cm soil profile, and no evidence of downward migration was observed. In soil columns, P. allius migrated only 30 cm upwards to transmit tobacco rattle virus to indicator plant. The deep-placed nematodes transmitted the virus when plant roots were allowed to grow toward them.