Nematology (2000) 2, p. 782 (Peng et al.)

Yunliang Peng, Jan De Meutter, Godelieve Gheysen and Maurice Moens (2000)
Resistance and tolerance of Rosa spp. to Pratylenchus penetrans
Nematology 2 (7), 782-782
Presented at the 25th International Nematology Symposium, Herzliya, Israel, 2-7 April 2000
Abstract: Pratylenchus penetrans is one of the most damaging nematodes of roses. To develop alternatives for chemical control, resistance and tolerance of Rosa spp. to P. penetrans were studied. Ten day-old seedlings of 21 rose rootstocks were inoculated with 250 P. penetrans. R. virginiana was found to be resistant and R. canina cv. Superba was very susceptible. When 70 day-old rooted Rosa spp. and cultivars were inoculated with 500 P. penetrans, differences were found in the nematode multiplication between the 140 tested accessions. For tolerance observation, 14 rose rootstocks were inoculated twice with 1000 P. penetrans. R. rubiginosa, was the most tolerant with the least reduction of the plant fresh weight. Multiplication of six P. penetrans populations was compared on 13 rose rootstocks. A French population (Lavaltrie) reproduced significantly less than the others. R. virginiana was resistant to all populations. Differences in pathogenicity to R. dumetorum 'Laxa' between the six populations were significant. An increase in guaiacol peroxidase activity was observed in infected roots of R. virginiana, whereas in roots of 'Laxa' and R. canina 'Pollmers' we observed higher KCN-inhibitable peroxidase-like activities 50 days after inoculation. Increased HO-production in the infected roots of 'Laxa' was found to be related to its susceptibility.
Database assignments for author(s): Godelieve Gheysen

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Pratylenchus penetrans	Rosa (crop)	Belgium