Effects of the Temperature and Duration of the Initial Incubation Period on Resistance to Meloidogyne incognita in Tomato
Araujo, M.T.; Bassett, M.J.; Augustine, J.J.; Dickson, D.W.
Journal of Nematology 14(3): 411-413
1982
ISSN/ISBN: 0022-300X PMID: 19295733 Document Number: 194455
Tomato cultivars Floradade, Nematex-22 and PI 129149-2(sib)-5-4 were inoculated with 200 M. incognita eggs and juveniles/seedling. After inoculation seedlings were either maintained at 32.5 deg C for 0, 3, 6, 9, 12 or 30 days and then transferred to 25 deg C to complete a 30-day incubation period, or maintained at 25 deg C for 0, 3, 6, 9, 12 or 30 days and then transferred to 32.5 deg C. Floradade supported the highest nematode reproduction in all treatments. In all incubation treatments following initial exposure to 32.5 deg C, except 30 days at 25 deg C, Nematex-22 had a lower reproduction rate than PI 129149. The reverse occurred with initial exposure to 25 deg C. It is suggested that to evaluate resistance in tomato it is necessary to maintain inoculated plants at 32.5 deg C for the first 12 days of a 30-day incubation period.