Stem rot most often afflicts Phalaenopsis and Vanda orchids and can be deadly if left untreated. Learn to identify, treat and prevent stem rot, or collar rot, in your orchid. #Orchid #OrchidCare #Phalaenopsis #StemRotStem rot most often afflicts Phalaenopsis and Vanda orchids and can be deadly if left untreated. Learn to identify, treat and prevent stem rot, or collar rot, in your orchid. #Orchid #OrchidCare #Phalaenopsis #StemRotStem rot most often afflicts Phalaenopsis and Vanda orchids and can be deadly if left untreated. Learn to identify, treat and prevent stem rot, or collar rot, in your orchid. #Orchid #OrchidCare #Phalaenopsis #StemRot