Combined effect of corn in the barrier crop and plant extracts against Cowpea mild mottle virus infecting soybean [Glycine max (L.) Merr.] in the field

Cowpea mild mottle virus (CpMMV) is one of the problems that can decrease soybean production. The research was conducted on combined effects corn in barrier crop with plant extracts against CpMMV infecting field. field data using a Completely Randomized Design. mean disease incidence and severity measured from total plants each replicate plot treatment. Planting or two lines were grown at edge four weeks before planting soybeans. Cashew nut shell (CNS), pagoda leaf, rhizome ginger applied sprayer 24 h acquisition transmission by whiteflies. result showed incubation period ranged 9−38 days after longer than untreated control. CNS extract as bioactivator most extended lowest absorbance value DAS-ELISA 0.20. There 73.11 % increase relative inhibition level virus. proved to be more effective monoculture extract. However, provides better (64.32 %) rows leaf plant.