Zoospores from a Sporangia (IMAGE) Virginia Tech Caption The photo shows zoospores that were just released from a sporangia (empty) by one of most frequently recovered Phytophthora species in irrigation systems. Zoospores are motile and the principal propagules of these pathogens in irrigation systems. Credit Chuanxue Hong Usage Restrictions The photo may be used with any discussion or coverage of the research by Dr. Chuanxue Hong. 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.