Fertilizing and disease control on Hippeastrum

Hans-Werner Hammen haweha@hotmail.com
Thu, 27 Oct 2005 17:56:09 PDT
>From: "Rodger Whitlock" <totototo@telus.net>
>Hans-Werner Hammen <haweha@hotmail.com> mentions the bulb
>scale mite Steneotarsonemus laticeps. Remember that the concept
>of spontaneous generation was disproved centuries ago.

Hi Roger;

it sounded really unbelievable to me and I first confirmed the term to be 
indeed identical with the German "Urzeugung" meaning that little critters 
are dirt-born.
Well I appreciate (in this very case) that my message gaves space to you for 
such a wild speculation -
where, did you say, was my message keeping this information?

Nevertheless, the facts relativate, what could at first sight be regarded as 

I experienced practically the entire bulb material I purchased from the 
Nederland's sources to be infected with the tarsonemid mite.
This animal is able to spread very easily in an amaryllogene plant 
It has to be regarded in its spreading behaviour - close - or better 
apparently related - to microorganisms.
I read that sciarid flies can transport several mites.
To say nothing of a possible transportation  by a windstream - a ventilator 
wind stream, for example.
I assume that many infection occur by contaminated soil and contaminated 

I lost an entire hippeastrum collection when I was 19 y old- due to the fact 
that I did NOT know about these things I have *ggg* the honor to generously 
inform you of.

I am in fulll concordance with Veronica Read (Hippeastrum - The Gardener's 
about the significance and the relevant properties of the tarsonemid mite.

Lucky those people who never have faced any problems with this disastrous 
On the GardenWebBulbForum there where many cases of postulated "red blotch" 
but all image material provided so far revealed clearly that the mite was 
the deeper reason for plant disease observed.

I do not know why some collections are not bothered by mites.
Although I do not believe that these are fully uncontaminated

For my part, I always experience a high infection pressure, from mites which 
(want to) emerge from the substrate upwards into the bulb scales; and 
therefore I have to spray the substrate surface and the bulb surface 
thoroughly and regularly in order to avoid serious damage.

And as essential message I repeat:
It is an important difference;
To worry about red blotch -
or to worry about the tarsonemid mite.
I have decided to worry about the latter, or better to concentrate my 
efforts on the fight against the true reason of the most important 
hippeastrum disease.

Certainly I cannot afford to set the wrong priorities - as I have just begun 
to introduce H.papilio germplasm from my regenerated 4ploid hybrid obtained 
from H.papilio x "Donau" - into other, bigger blooming tetraploid 
hippeastrums, the first being "Susan" as mother plant  - the first time that 
this wonderfull big pink did not refuse seed formation at all!


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