INTERACTION EFFECTS OF COWPEA MILD MOTTLE VIRUS (CPMMV) AND ROOT-KNOT NEMATODE INFECTIONS ON GROWTH AND YIELD OF COWPEA (Vigna unguiculata L. Walp.)
In order to ascertain the interactions between Cowpea mild mottle virus (CPMMV) and Meloidogyne incognita, screenhouse and field experiments were conducted in the early and late rainy seasons of 2014 in the tropical rainforest zone of Nigeria. The following treatments were applied 12 days after plan...
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| Main Authors: | , , |
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| Formato: | Online |
| Idioma: | inglés |
| Publicado: |
The Faculty of Agriculture Obafemi Awolowo University, Ile-Ife, Nigeria.
2022
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| Acceso en liña: | https://ija.oauife.edu.ng/index.php/ija/article/view/654 |
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| Summary: | In order to ascertain the interactions between Cowpea mild mottle virus (CPMMV) and Meloidogyne incognita, screenhouse and field experiments were conducted in the early and late rainy seasons of 2014 in the tropical rainforest zone of Nigeria. The following treatments were applied 12 days after planting seeds of Ife-Brown and Ife-BPC cultivars of cowpea in the screenhouse and field on nematode-free soil: inoculation of plant roots with 5,000 eggs of M. incognita per plant; inoculation of primary leaves with crude CPMMV sap; inoculation of plant roots with 5,000 eggs of M. incognita two days before inoculating with CPMMV sap; inoculation of primary leaves with crude CPMMV sap two days before inoculating plant roots with 5,000 eggs of M. incognita; simultaneous inoculation of primary leaves with crude CPMMV sap and roots with 5,000 eggs of M. incognita; and uninoculated control. Treatments were replicated four times, and arranged in a 2 x 6 factorial using randomized complete block design. Inoculation of M. incognita before CPMMV inhibited the virus infection by reducing the number of leaves showing symptoms from 12 to 5, and 10 to 7 in the fifth week of inoculation in Ife Brown and Ife BPC respectively under screenhouse conditions; under screenhouse and field conditions, single and combined infections recorded no significant difference in biomass; under screenhouse conditions simultaneous inoculation of M. incognita and CPMMV recorded the nematode population; 2.39 (249) while those of M. incognita only that recorded 1.91 (83) in Ife-Brown. In Ife-BPC, M. incognita and CPMMV recorded 2.27 (188) while M. incognita only recorded 1.96 (90). The study concluded that combined infection was more damaging than either of the single infections, and either of the pathogens could have a suppressive effect on the other depending on the time of their establishment. |
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