Brassavola Nodosa Brown Coloration - Orchid Board

Nyknos · #1 02-07-2021, 10:13 PM

Please I would like to get input as to why some of the flowers are coming out pure white and the others come out with a brown coloration
Orchid is growing on a palm tree.
I fumigate with the following mixture:
Thiomil 1-1/2 Tsp (Fungus Control)
Diathane M-45 1 -1/2 Tbsp (Soft Rot)
Permetrol 1 Tsp (Thrip Control)

Mixed in 1 gallon of water in a pump sprayer.
To start off sprayed 2 times 7-10 days apart
Then monthly on a regular basis.

This is the only orchid that has this issue

estación seca · #2 02-08-2021, 12:20 AM

What are your ambient temperatures and humidity now? What part of the country are you in? That is an awful lot of fungicide to use on a regular basis.

Nyknos · #3 02-08-2021, 06:52 AM

I live in the USA in South Florida
Orchid is on a palmtree has been there for quite a few years. Starting having coloration issues about a year ago.
I did the fungicide 2 times 7-10 days apart
Then monthly for two months only did not see much improvement.
All my other orchids do not have this issue.