Fail on blooming of dendrobium

[Midori]

Hi.. ,

I am new in this forum, as I am in Indonesia . ( sorry with my english)
I have problem with my dendrobiums which the most of the flower is fail to bloom. and I found bad root ( brown root) . this conditon is not always happen , it's just some time strike lots of my dendrobium ( I have nursery which contain about 5000 pot of dendrobium .
I need help whether this is because of bacteria, fungi or others.

Thank's

[Tobi]

Hi and welcome to the forum Midori. Hopefully you will be able to post a picture of one of
the infected plants for us to look at. What type of water are you using? If it is a bacterial
infection that is causing the rot, it could be coming from the water. Also do you have
adequate air circulation for your orchids? Is this occuring in a certain part of your
nursery?

[digitalgate]

saya dari singapore. ok. that all i can say in Indonesian. Can you post a picture?
which island do you stay?

[rmt135]

Selamat Datang Pak Midori,

Saya pun dari Singapura. Jangan malu untuk bertanya. Kami di sini sentiasa akan memberi bantuan kepada mereka yang memerlukan. Sekarang ini musim tengkujuh di kawasan kita. mungkin ada air yang terperangkap. Tolong postkan bererapa gambar supaya orang mahir dalam bidang orchid ini boleh menolong anda.

Now in English.

Welcom Pak Midori,

I am also from Singapore. Do not be shy to ask. We are here to help those in need. Now our area is experiencing wet season, is it possible that water may got trap somewhere. Please post a few pictures so that the expert in orchids can help you.

:knudde l:

[digitalgate]

he he , this is mini united nation here..

[Cynthia, Prescott, AZ]

Would I be like 'bringing coal to Newcastle' if I, who lives in dry Arizona, were to give advice on growing Dendrobiums to some one in Indonesia? For those of you where English is a second language, Newcastle is famous for coal mines.

But I have to assume, since Dendrobiums have such a tremendous variation in cultural needs, that your nursery may well be growing Den hybrids that are not composed of native Dens, or Dens from other parts of Indonesia than where your nursery is located.

So, my best guess is that you are growing these outdoors where they get natural rain fall, and I suspect they may be getting too much water in their dormant period. For those of us far from the equator, winter is a time when the typical hybrid Dens like to get very dry between waterings. My own experience is that this drying off often triggers blooms, then I increase watering a bit until the blooming is over. Phal type Dens like a several day dry period, and nobile Dens (which I am sure you don't have in your warm climate) take month long dry periods.

The rule of thumb is that, if the plant is in growth, new leaves forming, or if the plant is in spike, the plants can be kept on the damp side. Otherwise, they must be allowed to dry out very well before watering. For those Dens that should never dry out, you will find that they are always growing, so the above rule works for them too.

[Midori]

Originally Posted by Tobi

Hi and welcome to the forum Midori. Hopefully you will be able to post a picture of one of
the infected plants for us to look at. What type of water are you using? If it is a bacterial
infection that is causing the rot, it could be coming from the water. Also do you have
adequate air circulation for your orchids? Is this occuring in a certain part of your
nursery?

Hi , Thank's for the reply, I will sent the picture of my infected plant,
I hope thats ony because of the water since for the last 2 weeks is all day rain in my nursery.

Air circulatio is good, this is accuring in all part of my nursery . any way thank I will sent the picture of it.

Regards

[Midori]

Originally Posted by rmt135

Selamat Datang Pak Midori,

Saya pun dari Singapura. Jangan malu untuk bertanya. Kami di sini sentiasa akan memberi bantuan kepada mereka yang memerlukan. Sekarang ini musim tengkujuh di kawasan kita. mungkin ada air yang terperangkap. Tolong postkan bererapa gambar supaya orang mahir dalam bidang orchid ini boleh menolong anda.

Now in English.

Welcom Pak Midori,

I am also from Singapore. Do not be shy to ask. We are here to help those in need. Now our area is experiencing wet season, is it possible that water may got trap somewhere. Please post a few pictures so that the expert in orchids can help you.

:knudde l:

Hi You speak "Bahasa" very well,
Singapore have very good orchid there ,
I am not sure if it's only bacause of water.

[Midori]

Originally Posted by Cynthia, Prescott, AZ

Would I be like 'bringing coal to Newcastle' if I, who lives in dry Arizona, were to give advice on growing Dendrobiums to some one in Indonesia? For those of you where English is a second language, Newcastle is famous for coal mines.

But I have to assume, since Dendrobiums have such a tremendous variation in cultural needs, that your nursery may well be growing Den hybrids that are not composed of native Dens, or Dens from other parts of Indonesia than where your nursery is located.

So, my best guess is that you are growing these outdoors where they get natural rain fall, and I suspect they may be getting too much water in their dormant period. For those of us far from the equator, winter is a time when the typical hybrid Dens like to get very dry between waterings. My own experience is that this drying off often triggers blooms, then I increase watering a bit until the blooming is over. Phal type Dens like a several day dry period, and nobile Dens (which I am sure you don't have in your warm climate) take month long dry periods.

The rule of thumb is that, if the plant is in growth, new leaves forming, or if the plant is in spike, the plants can be kept on the damp side. Otherwise, they must be allowed to dry out very well before watering. For those Dens that should never dry out, you will find that they are always growing, so the above rule works for them too.

Hi..

My seedling if come from Thailand which this is hybrid in there. even in Indonesia alot of orchid as this is natural habitate but the information desease is not so much ,

from today I stop the watering ( usually I gave water in early morning before sun rise ) and I only gave spray for fertilizer which 2x a week. and fungiside once a week ( using Organic Fungiside ).

[digitalgate]

we were crying for the past few weeks because of the rain rain rain. Ujan .. uRgghhhh..
There is no much break in the rain.
OH, which island do you stay?

[Cynthia, Prescott, AZ]

I am looking at a map, and part of Indonesia lies on the equator, with the furthest extent of Indonesia going to 10 degrees south. This seems like a touch place to grow any Dens that are used to a seasonal change in the sun, as you would get 2 summers and 2 winters (in terms of day length, not temperature) each year. How about the growth pattern of your Den hybrids? Do they grow constantly, or do they have a short period where they stop growing, meaning no new leaves are forming. I can't tell when a dormant period occurs for areas so close to the equator, you will have to just observe your plants.

Now, for this disease you are referring to. Would certainly help to see pictures. But you refer to organic fungicide. Is this by any chance neem oil? Here in the US we have had a very serious problem with neem oil, and I believe the problem is with the storage temperatures. The MSDS's (material safety data sheets) for almost all of the neem oil products sold in the US say that storage temps are between 55F and 85F (29.4C). I am sure you have no problem on the low end, but how about the high end. Can I assume that neem oil in your country might be stored at temps higher that 30C, if not by you, certainly by your supply chain. I'm guessing that other horticultural oils may have a similar problem with temperature. Also, if you have used neem oil, did you followed the instructions that, after mixing with water, you must use it up in 4 to 6 hours, 8 hours max.

You may want to look at the damage I have had, probably most of it from the use of neem oil, tho most damage is probably due to secondary infections after the neem oil stressed the plants.
Symptoms NOT caused by virus Photo Gallery by Admiral Schnitz at pbase.com

[digitalgate]

Midori do you have any problem with pictures posting?

[Midori]

I have problem with sending picture , as my picture is to big , I have take new picture . I will sent once it's done.

By he way I found some worm in my flower. I think it come from Fruit Flies. now I gave organic insectiside and reduce watering . I found some progress but I still not satisfied with the result.

[Midori]

Hi..

About neem oil I will check whether my Organic fungiside using Neem Oil .

Thank's

[digitalgate]

neem oil will be too expensive for you and useless in my experience. For your Dendrobium
sunlight is a cure all for your plant. Do you have any black spot on the leaves? Does the
browning travel from bottom up.
Keep a look out for Snail and rat. Most of the time when they bite , they leave open wound for infection. use Rat glue on a heavy wood board and trap rat. They bite
flower, bite new shot, URgghh...

[Midori]

Dear Friends,
Here I sent the "Sick" Flower of my orchid. please help. seem water is not the issue since I stop watering and there is no raind for 2 weeks in Jakarta. I just use sprayer for water to keep humid.



Thank you

[Midori]

Dear Friends,
Here I sent the "Sick" Flower of my orchid. please help. seem water is not the issue since I stop watering and there is no raind for 2 weeks in Jakarta. I just use sprayer for water to keep humid.



Thank you

[Midori]

Originally Posted by digitalgate

neem oil will be too expensive for you and useless in my experience. For your Dendrobium
sunlight is a cure all for your plant. Do you have any black spot on the leaves? Does the
browning travel from bottom up.
Keep a look out for Snail and rat. Most of the time when they bite , they leave open wound for infection. use Rat glue on a heavy wood board and trap rat. They bite
flower, bite new shot, URgghh...

No I don't have black spot on the leaves and there is no pattern about the browning of my flower. seem it's cause by insect. but I don't want to use chemical , any advise for organic insecticied ?

Thank you

[rmt135]

The picture is a bit hazy at the top but it looks like bud blast. I had a Den that was in spike but I change its location – bud loss. It got too much heat.

Buds are sensitive, excessive imbalance of cultural conditions will cause bud loss. Too high or too low temperature can cause bud blast, as well as over or under watering. Carefully check the growing conditions. Usually at that point of bud maturity, all it takes is a blast of cold air, or even a sudden blast of heat.

Talking about insect, black ants like to lay their eggs at the bud. I had seen when my oncidium spike. It should be easy to get rid of these ants.

Another insect that I was not able to see or capture was when one of my Den bud turn soggy or mushy. According to a nursery friend of mine, an insect had lay eggs. I sprayed fungicide plus insecticide – the problem solve.

You may want to separate a few of your good Dens to another location & check whether the same can occur. If nothing happen & the Dens bloom set the rest to the same condition.

[digitalgate]

that kind of damage is done by rain. You really can't do anything about it. My dendrobium
has suffered the same fate by the recent rain. weather has improve these few day and condition of plant has improve. Hope your plant recover fast as chinese new year is just next week.

[rmt135]

Thats the reason I have all my orchids under shade - no direct rain except sun hehehehe.