Onion
Relative Toxicities of Insecticides and Miticides Used in Onions and Garlic to Natural Enemies and Honey Bees (1/02) ... [... more]
University of California IPM |
Pink Root
Prevention and control include avoiding repeated cropping of onion on the same soil, use of resistant varieties, good soil tilth and fertility, control of insects and other diseases to maintain healthy plants, and ... [... more]
University of California IPM |
Blue Mold Rot
Many species of Penicillium can cause blue mold. These fungi are common saprophytes on plant debris and senescent plant tissue. Invasion of onion bulbs and garlic is usually through wounds, bruises, or uncured neck ... [... more]
University of California IPM |
Sour Skin
Sour skin occurs on both onion and garlic, but usually is only a concern on onion. The pathogen, which survives in the soil, is splashed onto leaves and into the neck of the onion during rain or overhead irrigation. ... [... more]
University of California IPM |
Nematodes
If nematode species have not previously been identified, take soil samples and send them to a diagnostic laboratory for identification. Divide the field into sampling blocks of between 5 and 20 acres each that are ... [... more]
University of California IPM |
Integrated Weed Management
Onions are sown at high plant densities and not thinned in order to have the greatest possible yield per acre. They are planted with 4 to 6 seedlines on the top of beds that are 40 to 42 inches wide from furrow to ... [... more]
University of California IPM |
General Properties Of Fungicides
mefenoxam (Ridomil Gold) acylalanine systemic single-site high ... [... more]
University of California IPM |
Relative Toxicities Of Insecticides And Miticides Used ...
4 Ratings are as follows: 1-Do not apply to blooming plants; 2-Apply in evening after bees have stopped foraging; 3-Apply in late evening after bees have stopped foraging until early morning before they begin to ... [... more]
University of California IPM |
Susceptibility Of Weeds To Herbicide Control
C= control P= partial control N= no control -= no information ... [... more]
University of California IPM |
Black Mold
Black mold occurs on both onions and garlic. The fungus is first evident at the top or sides of the bulb where disease or injury has caused an opening in the skin. The fungus develops between dry, dead outer scales ... [... more]
University of California IPM |
Botrytis Bulb Rot
In onions, Botrytis bulb rot generally appears during storage, although infection originates in the field. Initial symptoms usually begin at the neck, where affected tissue softens, becomes watersoaked, and turns ... [... more]
University of California IPM |
Basal Rot
Plants affected by basal rot show progressive yellowing and dieback from the tips of leaves. Affected roots are dark brown to dark pink. A white fungal growth is sometimes evident at the base of infected bulbs. When ... [... more]
University of California IPM |
