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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. DOI: 10.18474/0749-8004-30.4.497, Published: OCT 1995…
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A new species of stubby root nematode was found for the first time in Tattnall county, GA infesting onion severely. Stubby root nematodes are soilborne parasites and virus vectors that feed on the root tips of onion and cause stunting and deformation of the roots. The damage symptoms in the field are patchy and can…
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Extension specialists, research scientists and extension agents working on cucurbits had a planning meeting on prioritizing research and extension needs for our cucurbit growers. We identified four important issues currently in GA: Whitefly and whitefly transmitted viral diseases (cucurbit leaf crumple and cucurbit yellow stunt disorder virus), Fusarium wilt of watermelon, Phytophthora capsici and plant…
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Downy mildew of cabbage has been detected from Colquitt County in Georgia (Oct 22, 2017). These observations indicate that inoculum of downy mildew is currently in GA and under favorable conditions (cool and wet conditions) potential disease outbreak in cabbage and other cruciferous/cole crops can occur. I would suggest our growers to look for the downy mildew symptoms in their fields and start applying…
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[caption id="attachment_381" align="alignnone" width="300"] Severe symptoms of Cucurbit leaf crumple virus on snapbeans[/caption]
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Pepper weevil has become a severe pest in multiple fields in south Georgia. The pest is present in damaging numbers in both pepper and eggplant fields. One field visited last week proved to have the worst infestation I have ever seen in pepper. A severe infestation was also seen in an eggplant field with no…
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While I have suspected this for some time, recent studies have confirmed my belief that neonicotinoid insecticides do not work well for control of silverleaf whitefly in snap beans. I have no idea why, but I have seen this multiple times. Several years ago I noted that in side-by-side tests, foliar applications of Assail and…
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Going into what will undoubtedly be a very heavy whitefly season, everyone should be aware of the 24C label for Knack in vegetables in Georgia. While this was established for “potential” use against caterpillar pests, it may be of interest for battling whiteflies. The 24C label allows for the reduced rate of 5 fl oz…
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It has come to my attention that whiteflies are not listed in the Pest Control Handbook under sweet potatoes. This was not an oversight. Having grown sweet potatoes in Tifton the last two years and not having a whitefly problem, I assumed they would not become a problem in sweet potatoes (despite the common name…
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While we have all been bracing for the potential onslaught of silverleaf whiteflies, the one bright spot was that the viral diseases that caused the bigger disasters in 2016 had not been seen in 2017. This is no longer the case. Cucurbit leaf crumple virus, which decimated snap beans and squash last fall, has been…