I noticed what I assumed to be powdery mildew on my Hoya Sunrise x unknown. This plant in particular I grew from seed and is just shy of being a year old. Certain vines on the plant had a white flour-like substance on them. I treated it multiple times with cooper fungicide but didn't notice any difference. I also used leaf shine to wipe off the leaves individually but it didn't seem to help. I saw someone post on one of the national Facebook groups about this issue and it was commented that it might be salt build up on the leaves. The recommendation was a 1:1 ratio of water and alcohol to wipe down the leaves. I tried this as well with no luck solving the problem. My latest attempt has been spraying on sulfur. There are still a few noticeable spots on some of the affected leaves but they don't look quite as powdery as before. Hopefully, another sulfur treatment or two will take care of the issue.
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Two and a half weeks ago I noticed my Hoya DR. IBOK seedlings weren't looking very developed for being sown on 05/09/2022. Luckily, the cell trays I had the seedlings in were clear so I pulled them out of the cache tray and saw white fuzzy root mealybugs all over the root systems of the seedlings. I tossed all the soil and rinsed the roots and leaves really well in hot water. I picked off any remaining pieces of soil particles from the roots before spraying them down with my alcohol spray. Alcohol spray: 1/2 cup isopropyl alcohol 70% 4 cups water Since that initial discovery I have treated with neem oil, more alcohol spray, and systemics. The cell trays I planted them in the second time are not clear so I am unable to check on the roots. However, I have noticed that the seedlings have put on new growth and are definitely back on track. I even added in some Osmocote fertilizer. I will continue to monitor them for root mealybugs as they grow but hopefully, they are taken care of. I was not comfortable chopping the roots since they are seedlings and I didn't know if they could survive that at this point. Thus, the chances of root mealybugs coming back are definitely higher. The life cycle of root mealybugs does slow down as the weather gets colder so hopefully that will be to my benefit with it being August already. beforeAFTERUPDATE 09/22/2022 I have not had to do any additional treatments on these seedlings since the initial infestation. I checked the roots on all of the seedlings and they are looking really good. They have continued to explode in growth. Something important to note is that root mealybugs can easily move from plant to plant through drainage holes so if you get an infestation make sure you aren't sharing the same water between plants and have some sort of tray around it to catch any water if your trays or pots have drainage holes.
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