Terry, I have never tried this on Catasetinae, but have used on other orchids. You might try sun oil. It seams to put a protective coating on the leaves. It has worked for similar problems on orchids.
Candy ----- Original Message ----- From: "Terry A. Glancy" <[EMAIL PROTECTED]> To: <orchids@orchidguide.com> Sent: Thursday, September 20, 2007 9:12 AM Subject: [OGD] mildew on Catasetinae > Hello OGDers --- we are starting to grow large quantities of the > Catasetinae and have seen the actively growing plants develop a lot of > black mildew primarily on the under leaf surfaces. There is also an > occasional glob of the black fungus on the flower buds. There are no > mites; no thrips; no mealybugs or scale - this is just fast growing > plants exuding a clear sticky "sap" that grows the mildew as a secondary > infection. It's pretty obviously linear under the leaves as the sap > production follows the major veins of the foliage. When the plants are > taken into our kitchen (air conditioned with lower humidity) for > photography, the clear sap does not contaminate with the mildew and > dries up slightly. The mildew is not pathogenic to the plants but it can > be pretty unsightly. It is also curious that different hybrids produce > different amounts of the sap exudate. > > I was wondering if anyone out there has had any successful > treatments for getting rid of mildew? The treatment has to be practical > on commercial quantities of plants, so hand washing individual leaves is > impractical. Lowering humidity in the middle of summer in south Florida > in a greenhouse with wet pads is also impossible. All I can think of is > a chemical control but reading various fungicide labels never mentions > mildew, other than downy mildew which this isn't. > > Does anyone have any suggestions? Thank You --- > > > > Terry A. Glancy > > Pine Ridge Orchids, Inc. > > 21100 SW 300 Street > > Homestead, FL 33030 > > > > ph (305) 247-4839 > > (305) 247-3086 > > fx (305) 247-8853 > > Email = [EMAIL PROTECTED] > > cc Email = [EMAIL PROTECTED] > > Website = http://www.PineRidgeOrchids.com > > > > _______________________________________________ > the OrchidGuide Digest (OGD) > orchids@orchidguide.com > http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com _______________________________________________ the OrchidGuide Digest (OGD) orchids@orchidguide.com http://orchidguide.com/mailman/listinfo/orchids_orchidguide.com
