Butter Bean Plant Diseases. Roots of the plant usually die and leaves turn yellow. Like many other fungal diseases, rust spots on bean plants are spread by airborne spores.
Pea and bean weevil (sitona lineatus) the pest can cause damage to spring beans if large numbers appear when plants are small. The leaves grow alternately on the stems, are green or purple in color and are divided into 3 oval leaflets with smooth edges. Many of these problems can be successfully avoided by following recommended cultural practices.
Mites suck plant juices causing mottled, speckled, cupped, wilted, or dead leaves.
Roots of the plant usually die and leaves turn yellow. Many of these problems can be successfully avoided by following recommended cultural practices. Brown spot was not considered an economic problem in new york until the early 1980s. When the pod of the plant gets plump up, do not pull it to harvest, for this, hold the vine with one hand and harvest the fruit with the other hand.