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Root knot nematodes found on onion (by Dr. Hajihassani)

Onion fields infested with root knot nematodes (RKN) were found in the Vidalia area. As can be seen in the picture (Photo: Aubrey Shirley), typical symptoms of RKN on above-ground parts of plants can involve patchy stunting, poor growth and yellowing of leaves. These symptoms are rather similar to nutrient deficiency. Premature wilting…
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Seedcorn Maggots in Transplanted Crops

Problems with seedcorn maggots in transplanted crops are popping up all over south Georgia this Spring. While this is a rare occasion (use of transplants avoids many soil borne insect problems), that makes it no less severe when it occurs. Maggots can kill tender young transplants, but cause minimal injury…
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Rhizoctonia damping off in watermelon transplants

Lately, UGA Plant Disease Clinic at Tifton received number of watermelon transplants with typical Rhizoctonia symptoms.  Rhizoctonia infection may cause a sunken, necrotic lesion near the soil line in seedlings. The lesion girdles the stem, and the seedling collapses and dies quickly. Cultural control In the greenhouse or seedbed, use…
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Downy Mildew of Onion Detected in Vidalia Onion Region

Downy Mildew of Onion (Chris Tyson, Tattnall County Extension Agent) Downy Mildew of Vidalia Onion (Peronospora destructor) was confirmed in the Vidalia Onion growing region on March 19, 2018.  This can be a highly destructive disease, causing serious losses in yield and bulb quality.  Growers need to be aware of its presence…
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Hard Freeze may pose threat of Sclerotinia in Brassicas

Because of the cold weather and freezing temperatures we have been experiencing, Sclerotinia sp. can be a problem in our cabbage, cauliflower, collards and other leafy brassicas. I would recommend a 5-day rotation with following fungicides; (Fontelis; at labeled rate) and (Endura; at labeled rate). Sclerotinia sclerotiorium usually begins on the lower…
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Whiteflies and freezing temperatures (by Stormy Sparks)

To address questions about whiteflies and freezing temperatures, Dr. David Riley recently sent the following information. Based on the reference: OVERWINTERING AND COLD TOLERANCE OF BEMISIA-ARGENTIFOLII (HOMOPTERA, ALEYRODIDAE) IN COASTAL SOUTH-CAROLINA By: SIMMONS, AM (SIMMONS, AM); ELSEY, KD (ELSEY, KD), JOURNAL OF ENTOMOLOGICAL SCIENCE, Volume: 30  Issue: 4  Pages: 497-506….
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