Hi there, I noticed something's going wrong on my Hoya Krimson Princess and Hoya Bella. I purchased the hoya krimson princess last year and it had those black spots already. However, recently I have rooted one hoya bella cutting and when it was rotting in water it started to develop purple vein and tip discolouration especially on the top leaves. After I put the rotted cutting into the soil, the whole plant gradually developed black spots on the leaf surface just like how my krimson princess looks like. These two plants are sitting next to each other so I am suspecting it is an bacterial infection. I have removed the severely affected leaves to potentially limit the bacterial spread to my other hoyas in the room. Do anyone know what is the cause and how can I save my plants?
Those black areas on the leaves of your Krimson Princess Hoya (Hoya carnosa 'Rubra') and Miniature Wax Plant (Hoya bella) could possibly be bacterial or fungal issues. What type of potting medium is being used and how often do you water them? Hoyas require bright light and a porous, well draining soil that will allow for good air circulation at root level and adequate drainage. If the soil is heavy and water retentive, it could cause issues at root level.
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Thanks plantladylin. I used approximately 50% regular potting mix, 20% perlite, 20% compost and 10%peat moss. Wondering if there is no way to cure the infection? I have moved those plants out of my room so other plants won't get infected.
For hoya bella, I water it when the top soil id dry as I know it thrives in a moister soil and I only water my krimson princess when the whole soil is dry. I had a soil moisture meter so I know I won't overwater it.