Watermelon 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 Agriculture–Agricultural 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.
The complete study and abstract are available on the ASHS Hortscience electronic journal web site: http://hortsci.ashspublications.org/cgi/content/abstract/44/2/256
Founded in 1903, the American Society for Horticultural Science (ASHS) is the largest organization dedicated to advancing all facets of horticultural research, education, and application.
Michael W. Neff | EurekAlert!
New technique reveals details of forest fire recovery
17.05.2018 | DOE/Brookhaven National Laboratory
Mixed forests: ecologically and economically superior
09.05.2018 | Technische Universität München
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...
A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.
The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...
Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.
Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...
A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.
Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...
02.05.2018 | Event News
13.04.2018 | Event News
12.04.2018 | Event News
18.05.2018 | Power and Electrical Engineering
18.05.2018 | Information Technology
18.05.2018 | Information Technology