Humidity if to high is when mold can get a grasp on ur plants.mold is always there in the air particales we breath on and all around ur plants all the time.but if things get sweaty and humid thats when mold can then form and be able to form and breed and demish what ever is in its way.good way to avoid rot.is not have an over crowded garden.and always defol along the way to keep good airflow around ur buds
and try keep temps steady.but i understand the weather outside plays a key part to our indoor garden.always a challenge but if u keep a step ahead u can keep the mold away.also budrot is most common come late flower.when ur buds are dense and fat.thats were mold loves to live in big fat dense buds.and can easily go undetected.so.keep a keen eye mate.happy growing