Black Slimy Critters - Knowledgebase Question

San Francisco, CA
Question by rubymrose
December 1, 1999
I have a 5 year old 'Jonathan' apple tree that produces great apples, but they have 1/2 in long black slug-like things in them. What are they and how do I get rid of them? Thanks for any help.


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Answer from NGA
December 1, 1999

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Black slug-like things are usually pear slugs, the larvae of flying insect. Generally they're found on cherry and plum tree leaves, but it's possible you'll find them on apple tree leaves, as well. These little guys feed on the surface of the leaf and they appear late in the season. Since the leaves are going to fall off soon, why not just rake the leaves and destroy them? This practice will reduce, if not eliminate, next year's population of adults. By the way, they're called pear slugs because of their pear-like appearance, not because they're fond of pears.

If this doesn't sound like your pest, call your county agricultural extension office (in the White Pages under U.S. Gov't; USDA) and find out where you can send a sample for identification. Best of luck!

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