Turfgrass Damage (IMAGE) Penn State Caption Penn State researcher Amy Baetsen-Young extracts sample plugs from golf course putting green turf infected by thatch collapse at Penn State's Joseph E. Valentine Turfgrass Research Center. Credit College of Agricultural Sciences, Penn State Usage Restrictions non commercial use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.