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Last year I had insect damage of some kind to my carrots. They grew fine but I had black marks and holes in them. I've never had that happen to carrots before but this is a new garden, this was the second year I've planted here. I'm assuming it was something in the soil and I'd like to prevent it this year so if anyone has some ideas that would be great. Thanks!
 

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Hmm. Do either of these fit?

Diseases & Pests
The Carrot Rust Fly - This pest lays its eggs at the base of the growing carrots. The larva of the fly chews tunnels and unsightly grooves through the surface of the root, causing rot. Unfortunately the damage isn't just cosmetic; the activities of the Carrot Rust Fly larva changes the flavour of the carrot and makes it quite inedible. Use our floating row cover to keep the adults away from the carrots. Plant after the beginning of June to avoid the first and worst infestation period. The good news for apartment dwellers who want to grow carrots on their balconies is the Carrot Rust Fly is not a good flyer. It is unlikely to infest their high-rise crop.
Wireworm - These are the larva of click beetles. They are about an inch and a half long, slender and reddish brown. When squeezed they turn as rigid as a wire, hence the name. Wireworms chew irregular holes through roots, making the carrots inedible. Wireworms prefer a moist soil so preparing your carrot bed so that it is well drained will help. Interplanting with mustard leaf is an excellent way to discourage wireworm damage. The flavour of the mustard is one deterrent, and mustard also helps to dry out the soil, forcing the wireworm away from the roots.
Predatory nematodes are an effective control for both Carrot Rust Fly and wireworm. Apply generously in the spring when the larva of both pests is most active.

http://www.westcoastseeds.com/how-to-grow/Vegetable-Seeds/Carrots/

Jennifer
 
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