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  #1  
Old 09-21-2018, 04:55 PM
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SaraJean SaraJean is offline
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Den. antennatum problems Female
Default Den. antennatum problems

I have a Dendrobium antennatum that has been giving me problems for the past 2 and a half years but I have no clue whatís wrong with it. I have four other species and one hybrid from the Spatulata section that are all growing extremely well. Itís only the antennatum that is misbehaving.
Issues:
1. Weak growth. Iíve had 6 new growths since I bought it. 3 have been shorter than the previous growth (1 short, the next tall, the following short, and so on..). All are fairly skinny, but not dehydrated. I repotted it in June, the root system is fantastic :/
2. An already developed, mature cane just shrivels up and becomes hollow halfway down or at the tip. No warning, not squishy, just fine minute and the next... hollow.
3. Susceptible to disease. I will get random rotting, squishy leaves. The top section of a new growth will rot and die back in a day. Again, not an issue on any of my other dens in this section.

It should be obvious that Iíve not bloomed this one. I guess what Iím wondering is if this is just a weak or potentially virused plant that is not going to grow well no matter what I do. Iíve treated it with fungicide, Inocucor, and spot treatments of hydrogen peroxide (rot on leaves and canes, not on the roots). Iíve increased the air movement, checked the roots and made sure it was not getting too much direct light at any given time of the day.
Should I just chuck it in the trash? Or am I missing something?

---------- Post added at 03:55 PM ---------- Previous post was at 03:14 PM ----------

Some pics from today. The nasty cane and leaf (pic #3 and #4) just showed up today, hence my frustration
IMG_3282 by Sara, on Flickr
IMG_3280 by Sara , on Flickr
IMG_3278 by Sara , on Flickr
IMG_3275 by Sara , on Flickr

Last edited by SaraJean; 09-21-2018 at 05:47 PM..
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  #2  
Old 09-21-2018, 11:05 PM
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estaciůn seca estaciůn seca is offline
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I'm not sure, but here's my thinking. I don't have antennatum, but several primary hybrid seedlings from H&R. These get to be very large, tall plants. Even in your wet climate, that pot/medium combination probably dries out rapidly. I suspect it isn't getting enough water. Mine struggle if I let them dry out even once during the growing season.

I would up the watering on that plant a lot. Then, when it's making new roots, and it's a good time to repot, I'd move it into a much larger pot, with similar fast draining medium having lots of air spaces. Continue watering a lot. A wide but shallow container will stabilize the plant and permit more air at the roots, so you can water more.
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It's a dry heat.

Last edited by estaciůn seca; 09-22-2018 at 12:36 AM..
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  #3  
Old 09-22-2018, 12:06 AM
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Right now, this one and my other Spatulata types are getting watered every day. I was concerned that maybe it was too much until I repotted it and saw how great the root system looked. Itís in about a 2:1 mix of Orchiata and sponge rock. So far, thatís been working ok with it draining quick for the wet summers, but still retaining a little moisture to get it through the hot days.
The newest growth is promising as itís the fattest one I have had (so far... I have been fooled before), so Iíll try tossing it in a shallower wide pot when that one starts pushing roots and maybe back off on the sponge rock? assuming I can get it to that point, lol. I couldnít hurt and I really donít want to trash it just yet. Thanks

Last edited by SaraJean; 09-22-2018 at 12:15 AM..
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Old 09-22-2018, 12:37 AM
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With the additional information, now I'm thinking the pot is so small watering once a day isn't enough.
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Old 09-22-2018, 01:23 PM
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I think it looks ok and with your other similar types doing well I think your culture is probably fine and wouldnít change all that much. I only have one hybrid right now and I keep it dryer and full light so donít think you should water more than you already do. Also I wouldnít repot either if the roots look really good, thatís like the biggest challenge right there just getting good roots. I think it may just be taking itís time to get to a point where it can take off.

That said, my concern would be the mushy leaves and hollowing out stems. Iíve been experimenting with Inocucor and thatís really worked out a number of my plants that exhibited what I call an imbalance of pathogens/ beneficial bacteria. Id say try using it again and apply judiciously. With kelpmax. I would just spray it down really well with solution for a few days straight, really Ray recommends soaking overnight for first application but with potted things Iíve done just really good spraying. Ray recommends just once a month, every 2 weeks max for follow up applications I think but Iíve pushed it to application once a week (just Inocucor) after initial 3 day application for 3 weeks to be clear of stopping rot and havenít seen reoccurrences.
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Old 09-23-2018, 12:07 AM
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Maybe the leaves are getting watered?

What time of the day do you water them?

Do not throw it away. It is ok.
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Old 09-24-2018, 09:33 AM
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Quote:
Originally Posted by u bada View Post
I
That said, my concern would be the mushy leaves and hollowing out stems. Iíve been experimenting with Inocucor and thatís really worked out a number of my plants that exhibited what I call an imbalance of pathogens/ beneficial bacteria. Id say try using it again and apply judiciously. With kelpmax. I would just spray it down really well with solution for a few days straight, really Ray recommends soaking overnight for first application but with potted things Iíve done just really good spraying. Ray recommends just once a month, every 2 weeks max for follow up applications I think but Iíve pushed it to application once a week (just Inocucor) after initial 3 day application for 3 weeks to be clear of stopping rot and havenít seen reoccurrences.
Iíve been keeping up with the Inocucor at once a month but it might be time for this one to get a good long soak in the solution and try some repeat doses like you mention


Quote:
Originally Posted by King_of_orchid_growing:) View Post
Maybe the leaves are getting watered?

What time of the day do you water them?

Do not throw it away. It is ok.
I water in the mornings but the leaves definitely get water on them since itís grown outdoors in the rain. During the winter it is in the greenhouse with a fan and I am a lot more careful with my watering. I guess itís just confusing me since this doesnít seem to bother any of my other Dens (or any other of my orchids). This year, I did add a fan to my summer grow space to help dry things off and cool things down.
Also, the tallest cane is the only one that left of the original. It keeps trying to grow, but itís struggling. Maybe move it out of the rain for now and let it recoup?

---------- Post added at 08:33 AM ---------- Previous post was at 08:26 AM ----------

Quote:
Originally Posted by estaciůn seca View Post
With the additional information, now I'm thinking the pot is so small watering once a day isn't enough.
That certainly could be the case. Itís in a regular 3Ē clay pot and if Iím remembering correctly, there might be a little LECA on the bottom as well. I wish I would have taken a picture of the root system when I repotted, itís the only reason I didnít trash this orchid back in June. It was a tight fit in the pot but with only 3 semi-decent canes, and the rot problems I keep having, I figured a larger pot would be pushing my luck.
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Old 09-24-2018, 09:40 AM
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Maybe try getting it out to of the rain for now and see how it does.

Also maybe try what es had said and give it a slightly larger pot. It is worth a try if the roots are as strong as they're being mentioned to be.
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