Image: Bean Rust Disease on Green Bean Leaves

This high-resolution landscape image captures the symptomatic presentation of bean rust disease (Uromyces appendiculatus) on green bean (Phaseolus vulgaris) foliage. The composition features a dense arrangement of mature bean leaves, each prominently displaying the characteristic signs of infection. The leaves are ovate to heart-shaped with pointed apices and slightly undulating margins, arranged in overlapping layers that fill the frame.

The primary visual hallmark of the disease is the presence of numerous rusty-orange to reddish-brown pustules (uredinia) scattered across the leaf surfaces. These lesions vary in size from 1 to 3 mm in diameter and are typically circular to irregular in shape. Many pustules are surrounded by chlorotic halos—yellowing zones that indicate localized tissue damage and the plant’s defensive response. The pustules are slightly raised and textured, giving the leaf surface a mottled, granular appearance.

Leaf coloration ranges from vibrant green to pale yellow-green, depending on the severity of infection. Veins are clearly visible, forming a pinnate network with a dominant central vein and finer lateral branches. The leaf surfaces exhibit a matte texture with subtle venation and epidermal cell patterning visible beneath the rust lesions.

Natural lighting enhances the realism of the scene, with soft, diffused sunlight illuminating the leaves and casting gentle shadows that emphasize the three-dimensional structure of the foliage. The background is softly blurred, suggesting additional bean plants and stems, which helps isolate the diseased leaves in the foreground.

This image is ideal for educational, diagnostic, and cataloging purposes, offering a clear visual reference for identifying bean rust in field conditions. It highlights the disease’s impact on leaf physiology and provides a realistic depiction of symptom progression, useful for agronomists, horticulturists, and plant pathologists.

The image is related to: Growing Green Beans: A Complete Guide for Home Gardeners