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Red Blotch: Is this what I should do.

Posted by gyozu 7 Winston-Salem, NC (My Page) on
Sun, Nov 7, 10 at 15:01

I have noticed over the last couple of years that the leaves on my plants were developing red rusty spots that would eventually kill the leaf. The plants, however continue to bloom quite nicely, throw offset bulbs and leafout with long dark green fronds.

I know they are very common types, but I do not want to get rid of these bulbs for sentimental reasons. 2 of the three original bulbs came from a departed relative over 10 years ago. Over the years my herd has gone from 3 original bulbs to over 40. I have started to group the three colors into one bowl and place them with friends and family so that they can enjoy a wonderful blooming display and then I take them back till next year. None of the people have Amaryllis (Hippeastrum) and I do not trade with anyone.

In searching around it seems that I might be able to eradicate or at least slow down the spread by either a 30 Minute soaking of the bulbs in hot (104 F - 114 F) degree water or treat with a Thiophanate based fungicide (Benlate).

My question is:

Is there a better treatment than fungicide or hot water bath?

Would it be wise to combine the two treatments?

How should I prep the bulbs for treatment?

I have just brought them in for the resting period and to let the leaves dry out. They are all due for repotting and the will all need to be treated.

Following are some photos. The blooming picture is from 03-2009.

Click thumbnails to enlarge image.

Photobucket Photobucket Photobucket Photobucket Photobucket Photobucket

Follow-Up Postings:

RE: Red Blotch: Is this what I should do.

Red blotch is a big problem here as well. I would just not feel good about hot water treatment myself, but I hear it works for what ails ya! I use Captan and spray all of my Amaryllids maybe 3x per summer as both a treatment and a preventative. If it gets bad it can cause your bloom spikes to be deformed as I recall. Pretty Hippis by the way :o) Dan

RE: Red Blotch: Is this what I should do.

For me the last picture looks like they are sitting in a too dense soil. My recommendation against the red blotch would be to repot them into a more aired soil and water rarely but then not sparingly.

All my Hippeastrum are sitting in cocofibre with a layer of clayballs underneath. I water once a week or so in the saucer so that the clay can suck up all the water. A whole saucer full of water is drained within half a minute, that's a sign for me that the plants needed water. If water stays longer than a minute in the saucer, I flush it away.
This way all bulbs receive enough water but never get wet themselves. The basal plate is the critical part and it is quite a bit away from where the water is given.

This only works if the plants are inside all year round, because water from above compresses the cocofibre.

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