Evaluation of Different Nematicides Against Root-Knot Disease in Chilli Caused by Meloidogyne incognita
Evaluation of Different Nematicides Against Root-Knot Disease in Chilli Caused by Meloidogyne incognita
Roshan Ara1, Muhammad Ali Khanzada1, Amir Khan Korai1*, Abdul Mubeen Lodhi, Anam Mehwish Khanzada1, Khalid Hussain Qureshi1, Shakal Khan Korai2*
ABSTRACT
The study investigated the impact of root-knot nematode (Meloidogyne incognita) infection on chilli plants and evaluated the efficacy of various chemical nematicides in controlling the infection. Infected plants exhibited symptoms such as pale green to yellow discolouration, stunted growth, and the development of knots on roots containing egg masses and female nematodes. Pathogenicity tests on “Ghotki” chilli plants revealed a direct correlation between inoculum levels of M. incognita and infection severity, with higher inoculum levels resulting in increased knot formation, nematode counts in roots and soil and reduced shoot and root growth. Four chemical nematicides (Actara, Furadan, Ulala, and Rugby) were evaluated at various concentrations. Overall, all nematicides were effective in reducing M. incognita and increasing chilli plant growth. Higher doses of nematicides were more effecctive, with some treatments completely removing nematode presence in roots and soil. Actara (500 ppm, 1000 ppm, and 2000 ppm), Furadan (50 ppm to 2000 ppm), Ulala (1000 ppm and 2000 ppm), and Rugby (250 ppm to 2000 ppm) treatments completely inhibited root knot formation. Furadan at 2000 ppm produced the longest roots, whereas Actara at 2000 ppm produced the most shoot length and weight. In conclusion, the study highlights the detrimental effects of M. incognita on chilli plants and demonstrates the effectiveness of chemical nematicides in controlling root-knot nematode infections. Higher concentrations of nematicides showed superior efficacy, effectively preventing root knot formation and promoting healthier plant growth. These findings contribute to understanding nematode management strategies in the agricultural field.
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