Onion

“This pathogen has a broad host range including garlic, leek, onion, shallot, asparagus, tomato, radish, sunflower, parsley, alfalfa, and soybean.”

“Plant clean seed and rotate out of alliums for at least 4 years after an infestation. Avoid planting alliums directly after brassicas, corn, grain, or grass cover crops.”

“Do not plant onions near alfalfa, clover, cucurbits or brassica crops that can harbor large populations of thrips, which may migrate to onions when these crops are cut or harvested.”

“Onion Thrips (Thrips tabaci) Onion thrips can be a significant problem on cabbage, where thrips feed on inner leaves of the head which are difficult to target by spraying. Damage may also occur on leafy brassicas such as broccoli, kale, and collards, especially fall crops that are planted near a maturing onion crop.”

“Plant clean seed and rotate out of alliums for at least 4 years after an infestation. Avoid planting alliums directly after brassicas, corn, grain, or grass cover crops.”

“Do not plant onions near alfalfa, clover, cucurbits or brassica crops that can harbor large populations of thrips, which may migrate to onions when these crops are cut or harvested.”

“Do not plant onions near alfalfa, clover, cucurbits or brassica crops that can harbor large populations of thrips, which may migrate to onions when these crops are cut or harvested.”

“Onion Thrips (Thrips tabaci) Onion thrips can be a significant problem on cabbage, where thrips feed on inner leaves of the head which are difficult to target by spraying. Damage may also occur on leafy brassicas such as broccoli, kale, and collards, especially fall crops that are planted near a maturing onion crop.”

“Plant clean seed and rotate out of alliums for at least 4 years after an infestation. Avoid planting alliums directly after brassicas, corn, grain, or grass cover crops.”

“Plant clean seed and rotate out of alliums for at least 4 years after an infestation. Avoid planting alliums directly after brassicas, corn, grain, or grass cover crops.”

“Do not plant onions near alfalfa, clover, cucurbits or brassica crops that can harbor large populations of thrips, which may migrate to onions when these crops are cut or harvested.”

“Allelopathic effects usually taper off after about 30 days. After killing rye, it’s best to wait three to four weeks before planting small-seeded crops such as carrots or onions. If strip tilling vegetables into rye, be aware that rye seedlings have more allelopathic compounds than more mature rye residue. Transplanted vegetables, such as tomatoes, and larger-seeded species, especially legumes, are less susceptible to rye’s allelopathic effects (117).”

“Plant clean seed and rotate out of alliums for at least 4 years after an infestation. Avoid planting alliums directly after brassicas, corn, grain, or grass cover crops.”

“Do not plant onions near alfalfa, clover, cucurbits or brassica crops that can harbor large populations of thrips, which may migrate to onions when these crops are cut or harvested.”

“Plant clean seed and rotate out of alliums for at least 4 years after an infestation. Avoid planting alliums directly after brassicas, corn, grain, or grass cover crops.”

“Avoid planting in fields with a history of white rot; there is little to be done once a field is infested with S. cepviorum, and crops should be rotated out of alliums for as long as possible.”

“Do not plant garlic near other allium crops or alfalfa, clover, cucurbits, or brassicas, as these can harbor large thrips migrating to garlic when these crops are cut or harvested.”

“Generally, ALM attacks allium crops such as chives (A. schoenopanasum), garlic (A. sativum), leek (A. porrum), onion (A. cepa), ramps (A. tricoccum), and scallion (A. fistulosum).”

“Leek Moth (Acroleopiosis assectella) Though leek moths feed upon most cultivated alliums, leeks are the most preferred and susceptible host species. Because garlic and onions are generally harvested for their bulbs, leek moth feeding damage tends to be less of a concern in these crops, as even moderate damage to the above-ground foliage typically does not lead to significant reductions bulb size or yield.”

“This pathogen has a broad host range including garlic, leek, onion, shallot, asparagus, tomato, radish, sunflower, parsley, alfalfa, and soybean.”

“Plant clean seed and rotate out of alliums for at least 4 years after an infestation. Avoid planting alliums directly after brassicas, corn, grain, or grass cover crops.”

“Do not plant onions near alfalfa, clover, cucurbits or brassica crops that can harbor large populations of thrips, which may migrate to onions when these crops are cut or harvested.”

“Onion Thrips (Thrips tabaci) Onion thrips can be a significant problem on cabbage, where thrips feed on inner leaves of the head which are difficult to target by spraying. Damage may also occur on leafy brassicas such as broccoli, kale, and collards, especially fall crops that are planted near a maturing onion crop.”

“Leek moth (LM) is a serious pest of members of the Allium family which includes onions, garlic, leeks, chives and shallots.”

“Generally, ALM attacks allium crops such as chives (A. schoenopanasum), garlic (A. sativum), leek (A. porrum), onion (A. cepa), ramps (A. tricoccum), and scallion (A. fistulosum).”

“Leek Moth (Acroleopiosis assectella) Though leek moths feed upon most cultivated alliums, leeks are the most preferred and susceptible host species. Because garlic and onions are generally harvested for their bulbs, leek moth feeding damage tends to be less of a concern in these crops, as even moderate damage to the above-ground foliage typically does not lead to significant reductions bulb size or yield.”

“This pathogen has a broad host range including garlic, leek, onion, shallot, asparagus, tomato, radish, sunflower, parsley, alfalfa, and soybean.”

“Avoid planting in fields with a history of white rot; there is little to be done once a field is infested with S. cepviorum, and crops should be rotated out of alliums for as long as possible.”

“Plant clean seed and rotate out of alliums for at least 4 years after an infestation. Avoid planting alliums directly after brassicas, corn, grain, or grass cover crops.”

“Plant clean seed and rotate out of alliums for at least 4 years after an infestation. Avoid planting alliums directly after brassicas, corn, grain, or grass cover crops.”

“broadleaf weeds have time to set seeds in a grain crop before harvest, which is particularly a problem in noncompetitive or difficult-to-cultivate crops like onion and carrot”

“Avoid planting in fields with a history of white rot; there is little to be done once a field is infested with S. cepivorum, and crops should be rotated out of alliums for as long as possible.”

“Purple Blotch (Alternaria porri) Alternaria porri is most likely to become problematic when temperatures are warm (77°F–85°F) with high humidity. Small lesions will form on stems or leaves, eventually enlarging and becoming tan or purple. The pathogen overwinters in allium crop residue. Disease development is favored by warm, moist conditions. Practice long rotations with non-allium crops”

“Do not plant onions near alfalfa, clover, cucurbits or brassica crops that can harbor large populations of thrips, which may migrate to onions when these crops are cut or harvested.”

“This pathogen has a broad host range including garlic, leek, onion, shallot, asparagus, tomato, radish, sunflower, parsley, alfalfa, and soybean.”

“This pathogen has a broad host range including garlic, leek, onion, shallot, asparagus, tomato, radish, sunflower, parsley, alfalfa, and soybean.”

“This pathogen has a broad host range including garlic, leek, onion, shallot, asparagus, tomato, radish, sunflower, parsley, alfalfa, and soybean.”

“Do not plant onions near alfalfa, clover, cucurbits or brassica crops that can harbor large populations of thrips, which may migrate to onions when these crops are cut or harvested.”

“Do not plant onions near alfalfa, clover, cucurbits or brassica crops that can harbor large populations of thrips, which may migrate to onions when these crops are cut or harvested.”

“Do not plant onions near alfalfa, clover, cucurbits or brassica crops that can harbor large populations of thrips, which may migrate to onions when these crops are cut or harvested.”

“Plant clean seed and rotate out of alliums for at least 4 years after an infestation. Avoid planting alliums directly after brassicas, corn, grain, or grass cover crops.”

“Plant clean seed and rotate out of alliums for at least 4 years after an infestation. Avoid planting alliums directly after brassicas, corn, grain, or grass cover crops.”

“Plant clean seed and rotate out of alliums for at least 4 years after an infestation. Avoid planting alliums directly after brassicas, corn, grain, or grass cover crops.”

“broadleaf weeds have time to set seeds in a grain crop before harvest, which is particularly a problem in noncompetitive or difficult-to-cultivate crops like onion and carrot”

“On a low-producing muck field in New York where onion yields had fallen to less than a third of the local average, a single year of a dense planting of sorghum-sudangrass hybrid restored the soil to a condition close to that of newly cleared land (217).”

“When faced with infestations of the nematodes Meloidogoyne incognita and M. arenaria, Oswego, N.Y., onion grower Dan Dunsmoor found that a well-incorporated sorghum-sudangrass cover crop was more effective than fumigation. Further, the nematicidal effect continued into the next season, while the conditions a year after fumigation seemed worse than before the application. He reports that the sorghum-sudangrass cover crop also controls onion maggot, thrips and Botrytis leaf blight (217).”

“Resistant plants to juglone include beans, beets, cedar, cherry, corn, daffodil, elm, ferns, forsythia, hawthorn, hemlock, iris, locust, most maples, oaks, onions, orchard grass, pachysandra, sycamore, viburnums, and wheat (PNW Disease Management Handbook, 2016).”