Poisonous Weed like Queen Annes Lace

There is a very prolific weed, esp. in open fields and along roads, that is very similar to Queen Annes Lace, but it is a bright yellow green color, even the flower heads, and it has shorter branches from the main stalk. I know that it is a poisonous type weed in that the juices of the plant causes allergic reaction similar to poison ivy esp. when mowed or weed whacked. Do you know what this is called and how do you kill it?
Submitted by BHGPhotoContest

From your description, I think you mean wild parsnip (Pastinaca sativa). This is a biennial plant that originally came from Europe and Asia and has become naturalized in the US, especially in abandoned fields, along roadsides, and in open disturbed areas. Its umbels of yellow flowers bloom from May to October, so the season is very long, with lots of seeds. It can cause burnlike reactions, especially bad when weed whacked as bits of the plant fly off and come in contact with and irritate the skin. The chemicals that cause the problem are called  psoralens and they cause phyto (plant)-photo (sunlight)-dermititis. Wild parsnips are related to edible parsnips. If you have a lot of it on your property I would advise getting thoroughly covered up and then mowing the plants down, before applying a weed killer such as Round Up. If you don't want to use chemicals, smother the area with black plastic and let the plants cook for a season at least underneath during hot weather. Don't forget to clean any equipment thoroughly afterwards wearing rubber gloves etc.

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just read you answer about Queen Annes Lace and now I am wondering about what is growing in my flower bed? I did not plant these but they are growing up between other plants. How do I know if this is the "bad" plant growing and I need to pull it out before it gets out of hand?
Submitted by dotboy2379