Tom Creswell

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Anthracnose of garlic, a new disease to Indiana, may cause sunken, orange lesions on scapes.

Earlier this summer, sunken lesions were observed on garlic scapes on a small farm in east central Indiana. Lesions started out a cream or tan color (Figure 1), however under rainy or humid conditions, spore production caused lesions to turn orange (Figure 2). Larger lesions resulted in the collapse of the scapes. It is estimated that 45 to 50 percent of scapes were affected. Lesions ranged from ¼ to ½ inch long. Samples of these scapes were sent to the Purdue Plant and Pest Diagnostic Laboratory in West Lafayette where they were diagnosed as anthracnose of garlic, a new disease to Indiana. This new disease is caused by the fungus Colletotrichum fiorinae. This fungus has also been reported on elephant garlic in New York. Reports from New York suggest that onion is unaffected. In the US, C. fioriniae has also been reported as an Apple post-harvest decay, causing bitter rot on[Read More…]


Figure 4. A broad view like this gives an idea of the extent and distribution of the problem.

Thinking of sending samples of your vegetables to the Plant and Pest Diagnostic Lab for diagnosis or insect ID? Here are some tips to help the samples arrive in the best possible condition for testing. Fill out a sample submission form. Download at: https://ag.purdue.edu/btny/ppdl/Pages/physicalspecimens.aspx If sending more than one kind of plant or problem be sure to label each bag specifically and fill out a separate form. The PPDL is closed on weekend so if you are sending samples make sure you send them early in the week so they are not in transit over a weekend. Express delivery (next day or second day) is preferred for samples that may not hold up well. You are also welcome to deliver samples to us on campus. See our website for location, parking and other information. Information we need to make the most of your sample: Symptoms you are seeing (your main[Read More…]


Figure 1. Seedling tray covered in light foam material for shipping.

Thinking of sending samples of your vegetables to the Plant and Pest Diagnostic Lab for diagnosis or insect ID? Here are some tips to help the samples arrive in the best possible condition for testing. Fill out a sample submission form. Download at: https://ag.purdue.edu/btny/ppdl/Pages/physicalspecimens.aspx If sending more than one kind of plant or problem be sure to label each bag specifically and fill out a separate form. The PPDL is closed on weekend so if you are sending samples make sure you send them early in the week so they are not in transit over a weekend. Express delivery (next day or second day) is preferred for samples that may not hold up well. You are also welcome to deliver samples to us on campus. See our website for location, parking and other information. Information we need to make the most of your sample: Symptoms you are seeing (your main[Read More…]