Survey to Assess the Absolute Frequency, Relative Frequency, Relative Density, Absolute Density and Prominence Value of different Nematodes Associated with Gerbera and Capsicum in Polyhouse condition

Author: Sunil Awati, Manthesha H.D., S. Lingaraju, Virupaksha Prabhu H. and S.M. Mantur

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Abstract

Identification of nematode problem on crops grown under polyhouse is problematic to nematologist as well scientific research community. The present study was carried out with the purpose to assess the occurrence of prevailing plant pathogenic nematode associated with gerbera and capsicum grown in protected cultivation in north Karnataka. Survey on different genera of plant parasitic nematodes associated with gerbera grown in polyhouses of Kelageri, Navaloor and Pachapur revealed that, Meloidogyne incognita and Aphelenchoides sp. occurred more frequently followed by Helicotylenchus dihystera, Tylenchus-like PPN and Rotylenchulus reniformis with absolute frequencies of 83.3, 66.7, 50, 50, 16.7 respectively. Whereas nematodes associated with capsicum in polyhouses in Dharwad and Chabbi showed maximum diversity in genera of plant pathogenic nematodes such as Meloidogyne incognita and Rotylenchulus reniformis occurred more frequently followed by Pratylenchus sp., Tylenchus-like PPN, Hirschmanniella sp., Helicotylenchus dihystera and Aphelenchoides sp. with absolute frequencies of 66.7, 38.9, 16.7, 16.7, 11.1, 5.6 and 5.56 respectively. Based on prominence values, it was evident that in gerbera polyhouses surveyed, Aphelenchoides sp., H. dihystera, Tylenchus-like PPN and R. reniformis were prominent after M. incognita. Whereas, in the capsicum polyhouses surveyed, M. incognita was the most prominent nematode associated with capsicum followed by R. reniformis, Pratylenchus sp., Tylenchus-like PPN, Hirschmanniella sp., H. dihystera and Aphelenchoides sp.

Keywords

Gerbera, Capsicum, Meloidogyne, prominence value

Conclusion

Efforts were made to know the pathogenic nematode species associated with gerbera and capsicum crops grown in polyhouses located in North Karnataka. Twenty four soil/plant samples were collected from different polyhouses structures located in Dharwad, Belagavi, Bagalkote and Haveri districts. Totally twenty four polyhouses of both gerbera and capsicum were surveyed for the plant pathogenic nematode incidence. The collected rhizosphere samples of gerbera and capsicum were further subjected to soil processing and extraction of plant pathogenic nematodes. Morphological identification of the different plant parasitic nematodes and perineal pattern studies for Meloidogyne spp. was done and the prevalent nematodes were identified to genus level by and large, although species diagnosis was made with respect to the most prevalent/predominant nematode pathogen (and a few others). The most common plant pathogenic nematodes present were Helicotylenchus dihystera, Hirschmanniella sp., Rotylenchulus reniformis, Pratylenchus spp., Meloidogyne incognita, Tylenchus-like PPN on capsicum and gerbera grown in the polyhouses.

References

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How to cite this article

Sunil Awati, Manthesha H.D., S. Lingaraju, Virupaksha Prabhu H. and S.M. Mantur (2023). Survey to Assess the Absolute Frequency, Relative Frequency, Relative Density, Absolute Density and Prominence Value of different Nematodes Associated with Gerbera and Capsicum in Polyhouse condition. Biological Forum – An International Journal, 15(2): 811-817.