Cynodon dactylon L. for

The common and troublesome weeds present in these six crops in the 13 Southern states (VA, NC, SC, GA, FL, AL, MS, TN, KY, AR, LA, TX and OK) are regularly surveyed by State Extension Weed Specialists. The most recent survey includes 59 weeds which are common or troublesome in these six field crops (6). Twenty weeds on that list have been implicated as being allelopathic (Table 1) eleven are among the 10 most common in at least one of the six major field crops in the Southern states. Ten of these 11 weeds are considered to be among the 10 most troublesome, usually for the same crop in which it was found to be common. There is one weed [bermudagrass (Cynodon dactylon (L.) Pers] that is on the most troublesome list for cotton and tobacco, but not on any most common list. Similarly, giant foxtail (Setaria faberi Herrm.) is a common weed in tobacco, but apparently not a troublesome one. 

An unidentified Claviceps strain (No. 178) growing parasitically on Cynodon dactylon (L.) Pers. (common Bermuda grass), which is used as a forage crop for cattle in several Southern States in the U.S.A., appears to be responsible for Bermuda grass tremors . Extraction of the culture filtrates of this strain afforded ergonovine (41), ergonovinine (42), chanoclavine-I, and penniclavine (43). 

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