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:4/11/2017)... , Apr. 11, 2017 Research and ... Market 2017-2021" report to their offering. ... The global eye tracking market to grow at a ... report, Global Eye Tracking Market 2017-2021, has been prepared based on ... covers the market landscape and its growth prospects over the coming ...
(Date:4/5/2017)... YORK , April 5, 2017 Today ... is announcing that the server component of the HYPR ... known for providing the end-to-end security architecture that empowers ... HYPR has already secured over 15 million ... makers including manufacturers of connected home product suites and ...
(Date:3/30/2017)... 2017 The research team of The Hong ... fingerprint identification by adopting ground breaking 3D fingerprint minutiae recovery and ... speed and accuracy for use in identification, crime investigation, immigration control, ... ... A research team led ...
Breaking Biology News(10 mins):
(Date:5/26/2017)... Ca (PRWEB) , ... May 25, 2017 , ... ... of Terumo BCT case studies, describing how process development and economic ... new results of T-cell expansion using a hollow-fiber bioreactor system, along with techniques ...
(Date:5/24/2017)... LITTLETON, MA. (PRWEB) , ... ... ... Incorporated, the Northeast's premier provider of high quality relocatable and permanent modular ... space combines visual management tools and modern office design characteristics to help ...
(Date:5/23/2017)... ... 23, 2017 , ... A recent survey conducted by the Weed Science Society ... weed in 12 categories of broadleaf crops, fruits and vegetables, while common lambsquarters ranks ... and Canada participated in the 2016 survey, the second conducted by WSSA. A ...
(Date:5/23/2017)... ... May 23, 2017 , ... Vortex Biosciences , provider of circulating tumor ... circulating tumor cells using Vortex microfluidic technology ” in Nature Precision Oncology on May ... Dino Di Carlo and Dr. Matthew Rettig at the University of California, Los Angeles. ...
Breaking Biology Technology: