Association of nematodes with fruit crops in Bhubaneswar
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Date
2018-09
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OUAT
Abstract
Association of nematodes in the rhizosphere of 8 fruit crops by collecting 120 samples during
Kharif and Rabi 2016-17 in Bhubaneswar revealed presence of ten plant parasitic nematodes
and three groups of free living nematodes. Among plant parasitic nematodes, Rotylenchulus
reniformis and Hoplolaimus indicus were encountered in all 8 fruit crops, Tylenchorhynchus
mashhoodi (7), Hemicriconemoides mangiferae (6), Helicotylenchus dihystera (5), Caloosia
heterocephala (5), Xiphinema insigne (5), Aphelenchus avenae (5), Pratylenchus coffeae (3)
and Meloidogyne sp. (1) only in guava. In context to free living group nematodes
Dorylaimids, Mononchids and Rhabditids were each associated with all the 8 fruit crops.
While computing community analysis of individual fruit crops, Rotylenchulus reniformis in
papaya, Hoplolaimus indicus in jackfruit, Dorylaimids in all fruit crops except cashewnut and
Rhabditids in lime and papaya exhibited highest Absolute frequency (100%) followed by
Rhabditids and Mononchids in cashewnut indicating(86.67%)Absolute frequency. The lowest
Absolute frequency was recorded in Hemicriconemoides mangiferae (13.33%) in guava, with
respect to density of nematodes in individual fruit crops, maximum Absolute density of
Rotylenchulus reniformis in papaya (341), Mango (291.07), Lime (246.57), Guava (211.63),
Litchi (52.66), Tylenchorhynchus mashhoodi in jackfruit (251), Hoplolaimus indicus in
sapota (59.14) and Dorylaimids in cashewnut (33.58) were recorded. The least density was
reported in Aphelenchus avenae in sapota (4) and Hemicriconemoides mangiferae in guava
(4). In consideration to Prominence value, Rotylenchulus reniformis was adjudged as the most
prominent species in papaya (PV=340), mango (270.79), lime (238.21), guava (181.23),
while Tylenchorhynchus mashhoodi in jackfruit (224.5), Hemicriconemoides mangiferae in
litchi (41.97), Dorylaimids in cashewnut (85.93) and sapota (54) were recorded. In contrast,
Hemicriconemoides mangiferae in guava (PV=1.46) was the least prominent species. So far
as community analysis of nematodes in 120 samples of 8 fruit crops altogether was
concerned, Dorylaimids indicated highest frequency of occurrence (118) with 98.33%
Absolute frequency, the lowest being in Meloidogyne sp.(5). Maximum density was noticed
in Rotylenchulus reniformis (182.22) with the lowest density in Aphelenchus avenae (7.54).
When Rotylenchulus reniformis was treated the most prominent species (PV=155.15),
Aphelenchus avenae was marked the least prominent species (33.23).
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