Dry Beans
Abiotic disorders, those caused by noninfectious (abiotic) conditions, are as common as diseases caused by infectious agents such as fungi, bacteria, and viruses. ... [... more]
University of California IPM |
Leafminers
Leafminer adults are very small flies, 0.1 inch long, black to blue, with parts of the thorax, legs, and abdomen yellow. Usually there is a prominent yellow area at the base of the wings. The minute white eggs are ... [... more]
University of California IPM |
Susceptibility Of Weeds To Herbicide Control
W. M. Canevari, UC Cooperative Extension, San Joaquin Co. ... [... more]
University of California IPM |
Common Bacterial Blight
Symptoms of common bacterial blight first appear on leaves as small, watersoaked spots and/or light green areas. These spots enlarge and the tissue in the centers dies and turns brown. These irregularly shaped spots ... [... more]
University of California IPM |
Southern Blight
Initial symptoms of southern blight include a yellowing of the foliage with slight darkening of the stem just above the soil line. Lesions on the stem at or near the soil line develop rapidly, girdling the stem and ... [... more]
University of California IPM |
Cucumber Beetles
Cucumber beetles are frequently abundant in bean/pea fields, but damage is usually insignificant. The western spotted cucumber beetle is green, 0.25 inch long, and has eleven black spots on its wing covers. The ... [... more]
University of California IPM |
Fusarium Yellows Or Wilt (Common Beans)
Fusarium yellows was first described in California in 1928 and it has subsequently spread throughout the United States and into Central and South America. Although the disease is not uncommon in California, it has ... [... more]
University of California IPM |
Lygus Bugs
The lygus bug adult is approximately 0.25 inch long and about half as wide. It is generally brownish, but varies from green to straw-colored, to tawny to light brown; the body is marked with a pattern of different ... [... more]
University of California IPM |
Bacterial Brown Spot
Bacterial brown spot symptoms on leaves appear as oval spots that have dead (necrotic) tissue in the center surrounded by a narrow zone of light-green to yellow tissue. Water-soaking and slimy ooze is rarely seen ... [... more]
University of California IPM |
Thrips
Thrips are most noticeable and of greatest concern on young seedling plants. Their feeding will make the plants look ragged because they feed on young leaves and buds. A common sign of a heavy thrips infestation is ... [... more]
University of California IPM |
Empoasca Leafhoppers
Empoasca leafhoppers cause a symptom known as hopperburn in which the leaf margins turn yellow, particularly at the leaf tip, and these areas soon become necrotic. The entire leaf may become yellowed and the symptoms ... [... more]
University of California IPM |
Loopers
Loopers have many natural enemies that frequently keep them below economic levels, unless they are killed by insecticide applications. Important parasitic wasps include the tiny egg parasite, Trichogramma pretiosum, ... [... more]
University of California IPM |
