Abstract
The study investigated the effects of the interaction between Meloidogyne incognita and Cowpea mild mottle virus on soybean cultivars. Two weeks after planting, treatments were applied to the plants in both the screenhouse and field trials as listed; single inoculation of 5,000 eggs of M. incognita on roots of soybean seedlings, single inoculation of leaves of soybean seedlings with CPMMV sap, mixed inoculation 5,000 eggs of M. incognita on roots of soybean seedlings 2 days before inoculating leaves with CPMMV sap, mixed inoculation of leaves of soybean seedlings with crude CPMMV sap 2 days before inoculating plant roots with 5,000 eggs of M. incognita, simultaneous inoculation of leaves of soybean seedlings with crude CPMMV sap and plant roots with 5,000 eggs of M. incognita, and uninoculated plants (control). Data were collected on plant height, number of leaves showing symptoms, grain weight and nematode populations. The results showed that combined inoculations of CPMMV and M. incognita reduced the population density of the nematode and increased the growth and grain yields of M. incognita infected soybean cultivars. It also revealed that plants inoculated with the nematode at 2 days before the virus was inoculated significantly reduced growth and yields of soybean and increased nematode population densities compared to single infections and other combined infections.
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