Potato
Relative Toxicities of Insecticides and Miticides Used in Potatoes to Natural Enemies and Honey Bees (6/03) ... [... more]
University of California IPM |
Fusarium Dry Rot And Seed Piece Decay
Seed piece decay is reduced when seed pieces are planted under conditions that favor rapid suberization; Fusarium cannot infect cut surfaces after they are suberized. Warm the seed tubers to 50°F before cutting, and ... [... more]
University of California IPM |
Common Scab
Tuber symptoms of common scab vary in extent and appearance. Common scab lesions are usually circular and 0.25 to 0.33 inch (6 to 8 mm) in diameter, but they can be smaller in early stages of development and larger ... [... more]
University of California IPM |
Silverleaf Whitefly
Routinely check field margins for whiteflies; these areas are usually infested first. Be especially alert for rapid population build up when nearby host crops are in decline. During these critical periods, check ... [... more]
University of California IPM |
Nematodes
Take soil samples in fall from within the root zone of the previous crop after harvest or, preferably, just before harvest. Divide the field into sampling blocks of not more than five acres. Each block should be ... [... more]
University of California IPM |
Integrated Weed Management
The choice of an herbicide depends on weed species present, soil type, cultural practices, cultivar grown, and available herbicides. In many fields, two or three herbicide applications are made during the potato ... [... more]
University of California IPM |
Flea Beetles
The beetles feed on leaves and stems resulting in many small holes in the leaves. This damage is seldom extensive enough to be of concern but may indicate future damage to the tubers. Most damage is caused by the ... [... more]
University of California IPM |
Potato Psyllid
In most years potato psyllids are not a problem in California and are effectively controlled by natural enemies such as minute pirate bugs and damsel bugs. However, if unusually cool summers are followed by a mild, ... [... more]
University of California IPM |
Diseases Caused By Phytoplasmas
These diseases are uncommon in California. Beet leafhopper transmitted viresence agent is transmitted by the beet leafhopper, Circulifer tenellus; western aster yellows is transmitted by another leafhopper, ... [... more]
University of California IPM |
Herbicide Treatment Table
COMMENTS: Apply preemergence and sprinkle or incorporate shallowly after hilling. Use lower rate on relatively coarse-textured soil or soil low in organic matter. Use the higher rate on fine-textured soils or soils ... [... more]
University of California IPM |
Leak (Water Rot)
Leak, also known as water rot, causes spongy, wet internal rot of tubers. The diseased flesh is clearly demarcated from healthy tissue by a dark boundary line. In advanced infections, hollow cavities form and all ... [... more]
University of California IPM |
Sclerotium Stem Rot
Affected stems on plants with sclerotium stem rot first show a moist decay at or slightly below the soil surface where infection is initiated. Stem lesions expand up and down the stem, and all plant parts can be ... [... more]
University of California IPM |
