Looks maybe like morning glory, but until it's bigger would be impossible to tell.

It does matter on spacing and mulching. Good spacing greatly reduces the chance of transmission. The closer the plants are together, the easier it is for the wind or a human to accidentally move the spores to the next plant. Mulching is critical as it prevents soil splash. A lot of the spores fall harmlessly into the soil and their only vector to get back onto the plant foliage is via soil splash.