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Aerangis - irritating keikis

Discussion in 'Orchid Culture' started by xmpraedicta, Mar 6, 2011.

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  1. xmpraedicta

    xmpraedicta Prairie angraecoid nut Supporting Member

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    I have two species that have bloomed for me once or twice, but have failed to do so for 2 seasons now. Aerangis kirkii and Aerangis rhodosticta have both popped out 3-4 pups for the last year. I see little spike-like projections only to be disappointing when they turn into new growths. The rhodosticta is the worst, and there are now so many pups they're all growing mashed up into each other.

    I'm just wondering what I'm doing incorrectly - the leaves also don't seem to be getting as big as they should be. New leaves on both the mother plant and the numerous babies grow regularly, but are generally shorter than I've seen.

    Light is low-intermediate, and the only thing I can think of is that I'm not giving an appropriate winter cooling/drying; day temps range from 25-27C which is quite warm, due to the lights. Night is around 19-20C. I'm still trying to deal with that problem although I fear it's too late for this year. Any other ideas? Fertilized once weekly with 8:14:9 african violet fertilizer. Does anyone have experience with this problem?

    I saw over 6 'spikes' that are now swelling suspiciously into new growths on my aerangis kirkii. I can try and snap some photos later, but this is making me a little sad. Also, general cultural info for these two species would be appreciated as well.

    On an unrelated note, what's your best recommendation for scale? I've used Safer's End-all which is an insecticidal soap. It seems to work mediocre on scale, and good with mealies...also, I think it messes up root growth on my plants. I want to go systemic but Canada doesn't have any systemics for sale so I'd have to import it. Hand-treatment is not proving to be effective enough.
     
  2. Tom-DE

    Tom-DE Well-Known Member Supporting Member

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    Can't answer your question but what the hell are you feeding them? I am actually jealous that you got basal growths. I have three clones of Aerangis luteo-alba rhodosticta . They bloom every year but they have no basal growths that I have been hoping for, all single growth.
     
  3. T. migratoris

    T. migratoris Active Member

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    Tom - I have a handful of rhodostictas and all are clumpers - even the seedlings with 2" leafspans are already throwing basal keikis. All of mine came from Alan Koch at Gold Country Orchids in northern California. Some of Alan's parent plants look like tufts of coarse grass because of all of the keikis.
     
  4. Tom-DE

    Tom-DE Well-Known Member Supporting Member

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    Hot Damn! Not sure the origin of my plants... I need to grow mine a bit warmer and see if they will have basal growths.
     
  5. xmpraedicta

    xmpraedicta Prairie angraecoid nut Supporting Member

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    You can have some of mine .... if I can separate that huge mess off the plank. It's weird cause when I bought it, it had one nice neat growth...which makes me think that there might also be something environmental going on. Tom how cool do you grow yours in the winter
     
  6. Tom-DE

    Tom-DE Well-Known Member Supporting Member

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    Calvin, too bad you are in Canada, otherwise I will divide it for you:poke:

    For me, Summer day time high is under 75 and winter daytime high is low 60s. Night time low is from 55 to upper 60s depends on the time of the year. so mostly it is on the cool side of intermediate condition.
     
  7. Uluwehi

    Uluwehi angraecoids, dendrobiums and more Supporting Member

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    Calvin, I have seen the behaviour you described in two of my Aerangis in the past. Both were stressed and I think that shortened leaves and proliferation of basal pups may be a natural response less than ideal conditions. It certainly would help if it were possible to lower your night-time temps by a few more °C. If you could get even to 18 or 17°C in winter it would be great.
     
  8. xmpraedicta

    xmpraedicta Prairie angraecoid nut Supporting Member

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    Thanks for the hints Jacob - I've moved the tanks out of my room and night times are now dropping to around 18 or 19, so hopefully that helps. The kirkii is making some more little 'things' around the leaf axils ... maybe these will turn out to be spikes
     
  9. AHAB

    AHAB New Member

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    Can you get ahold of Safari?
    Excellent systemic.
     
  10. Reyna

    Reyna Orchid Obsessed Supporting Member

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    Calvin,
    I have both of those aerangis species. My kirkii in particular likes to keiki -- as you can see. But I don't seem to have trouble getting it to bloom. The lower nighttime temps will probably help, and mine gets a fair amount of light but is very humid. If nothing else when it does bloom you'll have quite a show. :) If the temperature adjustment doesn't work -- let us know. :)
     
  11. xmpraedicta

    xmpraedicta Prairie angraecoid nut Supporting Member

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    Thanks Reyna - I have it with lowered temps right now so we'll see what I can salvage. Do you have pictures of yours, by any chance? :)

    AHAB - e-mailed them to ask but chances are slim...I'm trying to source out local imidicloprid containing alternatives.
     
  12. Reyna

    Reyna Orchid Obsessed Supporting Member

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    Calvin,
    Hey there. Yes, I do have a couple of photos. As you can see -- mine tends to keiki and then those keikis keiki. :) The only photo I could find quickly with it in bloom was taken with my phone, so it isn't the greatest quality. But -- you get the gist. :) (And I didn't clean the leaves, just brought it in and snapped a photo by the laptop as I responded.)

    And looking through my notes, my kirkii tends to keiki in the spring, but it spikes in the summer with blooms in the fall. I do give it higher light in the summer--and it probably gets more fertilizer too as everything does in the summer.

    And, I don't know if you have it in the great north, but one great option for potted plants at least is a Bayer Tree and Shrub. It is imidipidicloride -- basically Merit in granular form. The packaging here says it is for trees -- but a generous teaspoon to a 6inch pot works great for killing scale and mealies on orchids. It is sold in all the big hardware store chains here-- so you might check.

    Good luck
    aerangis kirkii march 2011.jpg Aerangis kirkii Oct 2010.jpg aerangis kirkii underside march 2011.jpg
     
    Kipper likes this.
  13. xmpraedicta

    xmpraedicta Prairie angraecoid nut Supporting Member

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    Wonderful looking plant, Reyna! Gives me hope - I'm always under the (false?) impression that dormant eyes turn into keikis instead of spikes when something isn't right, so it's nice to know yours likes to both keiki and bloom. I have another kirkii which hasn't bloomed for me yet, but seems to be a bit different (leaves are larger) and doesn't keiki at all. Maybe it's genetics.

    Re) insecticides, it seems that most systemic insecticides were taken off the market in Canada a while back, so Bayer tree and shrub is also unavailable.
     
  14. Uluwehi

    Uluwehi angraecoids, dendrobiums and more Supporting Member

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    Oh lordy that is one magnificent plant, Reyna!
     
  15. Reyna

    Reyna Orchid Obsessed Supporting Member

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    Thanks guys -- and Calvin good luck. Let us know when it blooms.
     
  16. Patrick Murray

    Patrick Murray New Member

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    It's possible that you are feeding your plants at the wrong times of the year, encouraging growth rather than flower production. Feeding every watering is excessive, and can lead to root damage and excessive growth. maybe you could back away from the fertilizer during the late fall winter months and just water the plants. Resume watering with fertilizer in February when the growing cycle starts again, every other or third watering. As for you scale, ugh. I have had luck recently with Seven.
     
  17. xmpraedicta

    xmpraedicta Prairie angraecoid nut Supporting Member

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    Thanks for the advice - will definitely hold off on the fertilizing this winter!