I was looking at one of my gardens about 7 days ago and notice a yellow substance (looked like vomit) on some alyssum that was planted there. I took the hose and tried washing it off with the spray nozzle and the subsatnce started to foam a bit. Then about two days later the substance had turned brown so I had the hose in hand again so I sprayed it again and this time it looked like it was smoking and blew a dust cloud into the wind. Does anyone know what this was. It was really wierd and now it is just a crusty brown residue but the single alyssum plant is completely dead. Is this something that i should worry about? Let me know.
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