| OK - here is one general answer - I'm sure there will be more. It depends a little what genera of orchids you are talking about. For example, many of the oncidiums, intergenerics, & brassia seem to commonly get spots on the leaves that are often referred to as "normal". On the other hand I wouldn't expect "normal" black spots ever on phals & paphs. I'm sure there are exceptions - but this is my experience and what I've read of other's experiences. One of the best defenses against disease is to be sure and give your plants plenty of room and AIR MOVEMENT. Also water early in the day so they can dry out prior to dropping temperatures. |