Common bacterial blight, caused by the bacterium Xanthomonas campestris pv. phaseoli, affects green or snap, wax, field, and lima beans as well as the scarlet runner, mung, Tepary, urd, moth, hyacinth, and civet or Sieva beans, the Washington or white-flowered lupine, and fenugreek (Trigonella). Fuscous blight, caused by fuscous variant of the bacterium, occurs on field beans, civet, and scarlet runner beans. Common blight affects the foliage and pods of beans and causes significant losses in both yield and seed quality. The disease typically develops when contaminated seed is planted, when plantings are made in fields with a history of the disease, and when the climate is consistently hot and wet or humid.