Today at Rutgers University, thousands of hazelnut seedlings are being inoculated with spores of the fungus Anisogramma anomala to test their resistance to eastern filbert blight.
The inoculation procedure begins with cutting the stromata (mushroom-like fruiting bodies) from infected stems.
John Capik sprays seedlings in the inoculation
chamber with the spore solution.
The plants are raised normally after inoculations and even the susceptible ones (unknown at the time) grow well. By the end of the summer, the plants typically reach 6-8 feet tall. From here, they’re overwintered in a cold greenhouse for chilling. Proper winter chilling is necessary for the plants to leaf out and begin growing normally in the spring as well as to trigger the fungus to create the EFB cankers. They wake up and start growing the following March. It’s not until June or July that the EFB cankers become apparent and we can identify those that appear to be resistant to the disease.
These seedlings were inoculated last year, and
now we're waiting to see if cankers emerge
on the stems.