Navigation Links
Watermelon's hidden killer
Date:9/4/2009

CHARLESTON, SCWatermelon vine decline (WVD) is a new and emerging disease that has created devastating economic losses for watermelon producers in Florida. Caused by the whitefly-transmitted squash vein yellowing virus (SqVYV), the disease created monetary losses estimated at $60 to $70 million in Florida during the 2004 growing season. The virus has become endemic in Florida and has appeared to varying degrees every season since it was first observed.

Symptoms of WVD typically occur at or just before harvest, when the vines rapidly collapse. Although affected fruit can appear healthy, rind necrosis and flesh degradation are often evident when fruits are cut, dramatically limiting marketability. The disease progresses rapidly; in some fields vine decline increased from 10% affected plants to greater than 80% within a week. In other cases, entire watermelon fields were lost to WVD. Clearly, the healthy and popular watermelon is under siege from the WVD plague.

Responding to producers' concerns, scientists recently identified the cause of WVD and are seeking ways to control the plague. Chandrasekar S. Kousik and colleagues at the U.S. Department of AgricultureAgricultural Research Service (ARS) and SWFREC, University of Florida, published the results of a research study of WVD in a recent issue of the ASHS journal HortScience. "In this study, we presented results of greenhouse and field evaluations of U.S. plant introductions for resistance to SqVYV", explained Kousik.

Although whitefly management can significantly reduce the population of this SQVYV vector, complete control is not possible. Thus, the search for long-term and sustainable strategies to manage SqVYV remains important. Development of watermelon cultivars resistant to either SqVYV or its whitefly vector is a promising alternative.

Of the 218 plant introductions (PI) evaluated in the study, none were completely immune, but several PI showed varying levels of resistance and were further evaluated in greenhouse and field trials. "Our studies indicated that these PI could significantly slow down disease development over time compared with the susceptible cultivars, but also indicated that, under extreme circumstances, the resistance offered by some of the genes may not be enough to manage the disease," Kousik said.

The identification of potential sources of partial resistance to SqVYV suggests that watermelon germplasm with moderate resistance can be developed for breeding programs. The scientists suggest that even when some of these resistant genes are moved into commercial cultivars, an integrated approach that includes the use of reflective mulch, application of pesticides to manage whitefly populations, and weed/cucurbit crop volunteer control, will be needed to fully manage WVD.


'/>"/>

Contact: Michael W. Neff
mwneff@ashs.org
703-836-4606
American Society for Horticultural Science
Source:Eurekalert

Related biology news :

1. Hidden genitalia in female water striders makes males sing
2. Hidden infections crucial to understanding, controlling disease outbreaks
3. How hidden mutations contribute to HIV drug resistance
4. Researchers reveal insights into hidden world of protein folding
5. Using ground-penetrating radar to observe hidden underground water processes
6. Exploration of lake hidden beneath Antarcticas ice sheet begins
7. New plant study reveals a deeply hidden layer of the transcriptome
8. Poor Americans in the United States suffer hidden burden of parasitic and other neglected diseases
9. Stanford/Packard researchers find disease genes hidden in discarded data
10. UD plant biologists uncover top wetland plants hidden weapon
11. Biologists expose hidden costs of firefly flashes
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/19/2016)... DUBAI , UAE, April 20, 2016 ... can be implemented as a compact web-based "all-in-one" system ... in the biometric fingerprint reader or the door interface ... requirements of modern access control systems. The minimal dimensions ... the ID readers into the building installations offer considerable ...
(Date:4/14/2016)... Israel , April 14, 2016 ... Authentication and Malware Detection, today announced the appointment of ... assumed the new role. Goldwerger,s leadership appointment ... on the heels of the deployment of its platform ... BioCatch,s behavioral biometric technology, which discerns unique cognitive and ...
(Date:3/31/2016)... PROVIDENCE, R.I. , March 31, 2016  Genomics ... leadership of founding CEO, Barrett Bready , M.D., ... addition, members of the original technical leadership team, including ... Vice President of Product Development, Steve Nurnberg and Vice ... have returned to the company. Dr. Bready ...
Breaking Biology News(10 mins):
(Date:6/27/2016)... ... June 27, 2016 , ... ... Amgen, will join the faculty of the University of North Carolina Kenan-Flagler ... of strategy and entrepreneurship at UNC Kenan-Flagler, with a focus on the school’s ...
(Date:6/24/2016)... -- Regular discussions on a range of subjects including policies, debt ... said Poloz. Speaking at a lecture to the ... pointed to the country,s inflation target, which is set by ... "In certain areas there needs to ... goals, why not sit down and address strategy together?" ...
(Date:6/24/2016)... ... 24, 2016 , ... Researchers at the Universita Politecnica delle Marche in Ancona ... or pleural mesothelioma. Their findings are the subject of a new article on the ... are signposts in the blood, lung fluid or tissue of mesothelioma patients that can ...
(Date:6/23/2016)... June 23, 2016   Boston Biomedical , ... compounds designed to target cancer stemness pathways, announced ... granted Orphan Drug Designation from the U.S. Food ... gastric cancer, including gastroesophageal junction (GEJ) cancer. Napabucasin ... to inhibit cancer stemness pathways by targeting STAT3, ...
Breaking Biology Technology: