I just returned home from a month trip and i found my stems are starting to brown. Its almost like a powder which i can rub off on my hand. The leaves are wilted, which i assume from the heat, its been over 95 or so here the last month. Im thinking this is root rot of some sort from what my research as shown but i can't find any definitive answer. Im growing in auto pot hydroponic system. This happened last year as well but towards the end of the year so i did not pay attention so much