I have been in several situations recently where correctly identifying morningglories was important for getting good weed control.
Here is some recent information from UGA Extension Weed Scientist Dr. Eric Prostko on proper morningglory identification:
1) An old publication that helps with the identification of adult morningglory plants.
|Figure 1. Identifying Morningglory Species. Source: Dr. Dick Oliver, University of Arkansas, Weeds Today|
2) Some very good close-up pictures of seedling morningglory plants. Pictures are from LSU and Virgina Tech.
3) Why is this important? Not all morningglories are controlled equally by certain herbicides. Here are a few examples:
a) Gramoxone (paraquat) is generally good on most morningglory species but not smallflower.
b) Basagran (bentazon) is generally not effective on most morningglory species but will control smallflower.
c) Staple (pyrithiobac) is generally considered to be an excellent morningglory herbicide but not on tall.
d) 2,4-DB is less effective on pitted morninglory than other species.
e) Aim (carfentrazone) is considered a good morningglory herbicide but not on smallflower.