Causes of ALS. ALS is a somewhat diverse and decidedly mystifying disease. In more than nine out of every 10 cases diagnosed, no clear identifying cause of the disease is apparent, that is, patients lack an obvious genetic history, complete with affected family members.
Here is a list of some of the more common varieties, along with fruit and plant descriptions. 1  Aristocrat - this variety features a waxy skin and is medium green in color.  Black Zucchini - very dark green skin and almost white flesh, very common variety of zucchini.
There are yellow and even white colored zucchini. Check your seed pack or plant tag for the mature color of your particular zucchini), and be firm to the touch. If your zucchini feels mushy or soft, it could be starting to rot. Zucchini plants can get very large, and have very broad leaves.