<i>Squash vein yellowing virus</i> Infection of Vining Cucurbits and the Vine Decline Response

Webster, Craig; Kousik, Chandrasekar S.; Turechek, William W.; Webb, Susan E.; Roberts, Pamela D.; Adkins, Scott

doi:10.1094/pdis-01-13-0076-re

Cited by 14 publications

(6 citation statements)

References 16 publications

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“…However, in our experimental inoculations, SqVYV-infected plants showed symptoms on leaves, petioles, vines, and fruit, if present, and began to decline in 12 to 16 days regardless of plant age at time of inoculation, or greenhouse or field location. Similar vascular localization of SqVYV RNA has been observed in all SqVYV-infected cucurbit species regardless of the symptom phenotype, suggesting that this localization is not the only determinant of the induction of vine decline symptoms (36). Older plants in the current study required 2 to 4 additional days to decline but died unless they had no fruit, in which case no vine decline was observed.…”

Section: Discussionsupporting

confidence: 79%

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Physiological Effects ofSquash vein yellowing virusInfection on Watermelon

et al. 2013

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Adkins, S., McCollum, T. , W. W. 2013. Physiological effects of Squash vein yellowing virus infection on watermelon. Plant Dis. 97:1137-1148.Squash vein yellowing virus (SqVYV) is the cause of viral watermelon vine decline. The virus is whitefly-transmitted, induces a systemic wilt of watermelon plants, and causes necrosis and discoloration of the fruit rind. In the field, SqVYV is often detected in watermelon in mixed infections with other viruses including the aphid-transmitted Papaya ringspot virus type W (PRSV-W). In this study, watermelon plants of different ages were inoculated with SqVYV or SqVYV+PRSV-W in the greenhouse or SqVYV in the field to characterize the physiological response to infection. Symptoms of vine decline appeared about 12 to 16 days after inoculation with SqVYV regardless of plant age at time of inoculation, plant growth habit (trellised or nontrellised), and loca-tion (greenhouse or field). However, the presence of PRSV-W delayed the appearance of vine decline symptoms by 2 to 4 days, and vine decline did not develop on plants with no fruit. For all inoculation treatments, more severe symptoms were observed in younger watermelon plants. Physiological responses to SqVYV infection included reduction in plant and fruit weights, alterations in fruit rind and flesh color, reduction in fruit sucrose content, increase in fruit acid content, and changes in plant nutrient composition, particularly increases in Ca, Mg, B, Mn, and Zn and decreases in K and N. These results demonstrate wide-ranging physiological effects of SqVYV infection and provide new insights into watermelon vine decline.

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Section: Discussionsupporting

confidence: 79%

“…Flowers on seven trellised and 10 nontrellised plants were hand pollinated starting when plants were 36 days old to produce one fruit per plant. The effects of trellised (vertical) or nontrellised (horizontal) plant growth, and fruit or no fruit on development of watermelon vine decline were assessed in a second greenhouse trial.…”

Section: Methodsmentioning

confidence: 99%

Physiological Effects ofSquash vein yellowing virusInfection on Watermelon

et al. 2013

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“…The virus is transmitted by the whitefly Bemisia tabaci, biotype B (31). In addition to watermelon, the virus can infect numerous other cucurbit species, including several common cucurbit weeds, some of which serve as reservoirs for SqVYV (4,5,33). Symptoms vary depending on host but, in watermelon, infection by SqVYV results in a rapid collapse of the plant (hence the name watermelon vine decline) that typically occurs as the crop nears harvest (1).…”

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Spatial and Temporal Analysis of Squash vein yellowing virus Infections in Watermelon

et al. 2014

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Turechek, W. W., Roberts, P. D., Stansly, P. A., Webster, C. G., Kousik, C. S., and Adkins, S. 2014. Spatial and temporal analysis of Squash vein yellowing virus infections in watermelon. Plant Dis. 98:1671-1680.Squash vein yellowing virus (SqVYV) is a whitefly-transmitted ipomovirus infecting watermelon and other cucurbits that was recently introduced to Florida. Effects on watermelon are devastating, with total vine collapse, often near harvest, and fruit rendered unmarketable by brown, discolored flesh. The epidemiology of SqVYV was studied in a 1-ha field of 'Fiesta' watermelon over six growing seasons (I to VI) to characterize the spatial patterning of disease and temporal rate of disease progress, as well as its association with Cucurbit leaf crumple virus (CuLCrV) and Cucurbit yellow stunting disorder virus (CYSDV), two additional whitefly-transmitted viruses that often occur with SqVYV. The field was scouted at regular intervals for the length of the season for incidence of virus and number of whiteflies. Incidence of SqVYV reached 100% during seasons I, II, and V and 20% during season III. SqVYV did not occur during seasons IV and VI.SqVYV progressed in a characteristic logistic fashion in seasons I, II, and V but less so in season III. The rate of disease progress was similar for the three seasons with high disease incidence, with an average value of 0.18. A positive correlation between the area under the disease progress curve and whitefly-days was found, where both progress curves were calculated as a function of thermal time (degree days, base 0°C). SqVYV displayed significant but variable levels of aggregation, as indicated by its fit to the β-binomial distribution, the binary power law, and ordinary runs analysis. Association analysis indicated that the viruses were largely transmitted independently. Results of this study provide epidemiological information that will be useful in the development of management strategies for SqVYV-induced vine decline, and provide new information for CuLCrV and CYSDV.

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“…The known host range of SqVYV is limited to cucurbits with the most striking symptoms of vine decline (WVD) observed primarily in watermelon Webster et al 2013). Recently, other cucurbits were also shown to decline under experimental conditions .…”

Section: Introductionmentioning

confidence: 99%

Influence of Insecticides and Reflective Mulch on Watermelon Vine Decline Caused by Squash vein yellowing virus (SqVYV)

Kousik

Adkins

Webster

et al. 2015

Plant Health Progress

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Watermelon vine decline (WVD) caused by the whitefly-transmitted Squash vein yellowing virus (SqVYV) has been a serious limiting factor in watermelon production in southwest and west-central Florida over the past few years. Symptoms of WVD typically appear as sudden decline of vines a few weeks before harvest or just after the first harvest. Fruit symptoms include rind necrosis and flesh discoloration that affects fruit quality and marketability. The combination of insecticide treatments consisting of an imidacloprid drench (Admire Pro, 560 ml/ha) at transplanting followed by two foliar applications of spiromesifen (Oberon, 2SC, 490 ml/ha) and reflective plastic mulch was evaluated for management of WVD during fall growing seasons of 2006, 2007, and 2009. Virus inoculum source was introduced by planting SqVYV-infected squash plants at the ends of each plot. In all three experiments, the insecticide-treated plots had significantly lower levels of WVD on foliage and fruit compared to non-treated plots. In 2007, the reflective plastic mulch was effective in reducing foliar WVD compared to non-reflective mulch, but not in 2006 and 2009. No significant interaction between plastic mulch and chemical treatments was observed on WVD development on foliage or fruit. Our results suggest that application of insecticides for managing whiteflies can help manage SqVYV-caused WVD. Accepted for publication 13 January 2015. Published 25 March 2015.

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Squash vein yellowing virus Infection of Vining Cucurbits and the Vine Decline Response

Cited by 14 publications

References 16 publications

Physiological Effects ofSquash vein yellowing virusInfection on Watermelon

Physiological Effects ofSquash vein yellowing virusInfection on Watermelon

Spatial and Temporal Analysis of Squash vein yellowing virus Infections in Watermelon

Influence of Insecticides and Reflective Mulch on Watermelon Vine Decline Caused by Squash vein yellowing virus (SqVYV)

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