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BOULDER, Colo. — One day in fall 2018, Bo Gribbon began to vomit and couldn’t stop. He threw up multiple times an hour from morning to night before his mother drove him to the hospital near their home here.

Dangers of high potency cannabis for teenagers

“It felt like Edward Scissorhands was trying to grab my intestines and pull them out,” said Gribbon, then 17.

Roberts said the presence of these patients strains hospital resources. When faced with people suffering from bouts of nonstop vomiting, doctors often order up an array of diagnostic tests to rule out other underlying causes.

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Stacey R. Roberts, Postgraduate Researcher, Department of Agronomy and Range Science, UC Davis

The use of transgenic rice cultivars with �built in� resistance to broad spectrum herbicides such as glufosinate (Liberty) is progressing. Last year for the first time, research was conducted on a California variety (M-202). Single applications were good, but split applications of glufosinate were better. Depending on weed pressure and initial timing, growers will be able to determine if a second application is needed when bioengineered rice comes into commercial production.

Weed scientists conducted experiments to determine the requirements for weed suppression and the specific rice traits responsible for exerting competitive pressure. One experiment evaluated the response of four weeds (early watergrass, late watergrass, smallflower umbrella sedge and redstem) to shade to determine how much these weeds might be suppressed by rice plants with faster growth or a different type of canopy. All four species were affected, although by varying degrees. Results suggest the effect of reduced light is most important at early stages of weed growth.

Albert J. Fischer, Assistant Professor, Weed Science Group, University of California, Davis

Continuous rice culture and the restricted availability of grass herbicides have led to strains of watergrass showing resistance to different herbicides. However, recent testing showed that resistance to propanil is currently infrequent and low, suggesting that for the short-term this active ingredient will be a useful management tool. Researchers caution that overuse of propanil will accelerate resistance, as has happened in other rice growing regions. It is important that watergrass control be diversified by preventive, mechanical and cultural practices aimed at eliminating the survival, seed production and dispersal of plants that escape herbicide treatment. Avoidance of herbicides with the same mode of action should help delay the buildup of resistance.