Pathogenicity and Management of Meloidogyne graminicola in Rice (Oryza sativa L.), variety, Pusa Bhagwati under Bihar Conditions

Author: Gajja Bharath Goud, Nishi Keshari, Sethu Lakshmi S. and Palukuru Usha

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Abstract

Rice (Oryza sativa L.) is one of the most widely grown crops in the world, and is a staple food for more than half of the global total population. Root-knot nematodes (RKNs), Meloidogyne spp., especially M. graminicola, seem to be significant rice pests, which makes them the most economically important plant-parasitic nematode in this crop. The current investigation was conducted to ascertain the effect of initial population densities of Meloidogyne graminicola on the root-knot development, nematode multiplication and plant growth characters of rice seedlings under earthen pot conditions. When the inoculum density level increased from 10J2/pot to 10000J2/pot, vegetative and reproductive characters of the plant decreased significantly and nematode multiplication parameters increased significantly. The maximum galls per root system, eggs and juveniles per egg mass, nematode population/200cc soil, root knot index and number of females per gall were enhanced significantly with increase in inoculum level and maximum was at 10000 J2 /pot. The fungal biocontrol agent, Trichoderma viride @ 5g, 6g, 7g, 8g, 9g and 10g/pot with carbofuran @ 2kg a.i./ha as treated check and another untreated check in 1 kg soil were taken and the effect was reported on the development of plant and nematode multiplication parameters, keeping two sets as pre and post application of T. viride, one week before and after germination, respectively. Although carbofuran treated plants have shown significantly effective treatment but among the different doses of T. viride in both pre and post treatment, the highest dose10g/pot has given the maximum growth parameters and minimum nematode multiplication parameters in both pre and post treatments. When we compared the results in both pre and post treatments, it was revealed that in all the characters, the increase was higher in pretreatments than the post treatments.

Keywords

Trichoderma viride, Meloidogyne graminicola, Oryza sativa, Pusa Bhagwati, carbofuran

Conclusion

In the present study concluded that as the inoculum level increased plant growth parameters decreased significantly and nematode multiplication parameters increased significantly and management of M. graminicola can be done by increasing the T. viride level apart from the chemical control.

References

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How to cite this article

Gajja Bharath Goud, Nishi Keshari, Sethu Lakshmi S. and Palukuru Usha (2023). Pathogenicity and management of Meloidogyne graminicola in Rice (Oryza sativa L.), variety, Pusa Bhagwati under Bihar Conditions. Biological Forum – An International Journal, 15(10): 1501-1507.