Abstract:
Seventy nine nurseries of tobacco (Nicotiana tabacum, N. rustica) were surveyed for the presence of nematodes. Plant parasitic forms recovered were Helicotylenchus indicus, Aphelenchus avenae, PoratyIenchus spp., Meloidogyne spp. Helicotylenchus canadensis, Hoplolaimus californicus, H. indicus, Hopolaimus galeatus, Helicotylenchus mircolobus, Tylenchorhynchus acutus, Helicotylenchus pseudorobustus, Tylenchorhynchus nudus, Malenchus exiguus. T. acu-toides, T. conalis, Pratylenchus protensis, P. penetrans, Aphelenchoides sacchari, Pratylenchus coffeae, Scutellonema brodys and Rotylenchulus reniformis. This order also shows the intensity of the occurrence of nematodes. With regards to the frequency of occurrence, Aphelenchus avenue was the most frequently encountered species followed by Helicotylenchus indicus. The least frequent nematode species was Rotylenchulus reniformis. Stunting, unthrifty growth and yellowing of seedlings were the above ground disease symptoms. Helicotylenchus indicus and Pratylenchus spp. are considered to be important pest of tobacco nurseries in the study area. Occurrence of root-knot nematodes only in low number has been believed to be due to the extreme cold conditions of the months during which nursery seedlings are raised. Free-living nematodes found during the survey have also been listed.
Page(s):
279-283
DOI:
DOI not available
Published:
Journal: Pakistan Journal of Scientific and Industrial Research, Volume: 29, Issue: 4, Year: 1986