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Plant parasitic nematodes associated with Bt Cotton (Gossiypium spp)

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Title Plant parasitic nematodes associated with Bt Cotton (Gossiypium spp)
 
Creator Priti Shivaji.Sonavane
 
Contributor S.Lingaraju
 
Subject Plant pathology
 
Description A nematode random survey of the Bt cotton crop rhizospheres from the important Bt
cotton growing areas of north Karnataka revealed the presence of plant parasitic nematodes
like Aphelenchus sp., Hoplolaimus sp., Helicotylenchus sp., Pratylenchus sp., Rotylenchulus
reniformis, Tylenchoryhnchus sp., Dorylamids - like plant pathogenic nematodes and
Tylenchus - like plant pathogenic nematodes. Rotylenchulus reniformis was found to be the
most predominant nematode associated with cotton as revealed by the community analysis of
plant parasitic nematodes. Pathogenicity tests conducted on Bt cotton cultivar MRC-7918
showed that initial inoculum densities of 100 and above infective juveniles were pathogenic
to the cultivar reducing plant growth parameters. This nematode was found to complete its
life cycle in 27 to 29 days in Bt cotton cultivar MRC- 7918 under Dharwad conditions.
Among 25 Bt cultivars of Gossypium sp., three cultivars showed a disease index of 1, i.e.
Chiranjeevi and Tulsi-4 (BG-I) and RCH-2 (BG-II). Twenty of the cultivars showed a disease
index of 2 (resistant) and two of the cultivars, MRC-7918 and Tulsi-117, of BG-II were
moderately resistant to the infection caused by reniform nematode. Bt genes whether Cry 1
AC or Cry 2 AB or both in combination did not show any adverse effect on the spectrum of
nematode associated with cotton. Management studies were conducted with chemicals,
botanical, organic amendments and two PGPR strains belonging to Pseudomonas sp. Neem
seed powder at 5 g per 100 g of seeds for seed treatment effectively increased the plant
growth parameters and reduced the nematode population in soil and in root. This treatment
was followed by Calotropis latex (@ 5 per cent), Carbosulphan (@ 6 per cent) and PGPR-50
(Pseudomonas sp. @ 10 per cent) seed treatment.
 
Date 2016-11-09T18:01:51Z
2016-11-09T18:01:51Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/84758
 
Format application/pdf
 
Publisher UAS, Dharwad