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Old 08-04-2013, 11:27 PM   #1
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Default What disease is this?

Hello guys!
I hope you can help me find out what disease are my hop plants suffering from.
I have a Northern Brewer that has grown only about 2.5 meters(you can see it in the attached pictures), and a Saaz and a Hallertauer that i have trimmed down because they wouldn't grow bigger than ~1 meter (now i'm sorry i didn't took pictures before cuting them down, to be sure that they had the same problem...).
I have also one Cascade that has grown bigger than the trelis (picture attached), with no sign of disease, despite that all the plants ar relatively close to each other.
Keep in mind that all 4 plant are in their first year (planted in september from store bought little plants).

2013-08-04-19.39.05.jpg   2013-08-04-19.39.14.jpg   2013-08-04-19.39.28.jpg   2013-08-04-19.39.36.jpg   2013-08-04-19.40.00.jpg  

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Old 08-04-2013, 11:35 PM   #2
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Feline aids

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Old 08-05-2013, 12:09 AM   #3
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I'm sorry I have never grown hops so this is purely a guess but it looks like some sort of white powdery mold. I've seen this on cucumbers before especially.

I use a chemical by Bonide called Captan, it is a cheap and effective fungicide. Mix as directed and spray directly onto the leaves, it can also be mixed or added to soil to control damping off.

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Old 08-05-2013, 12:24 PM   #4
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I am not sure if it's a mold because, as you can see, the leaf turn yellowish befeore any kind of mold spots would appear. The bigger leaf that have turned brown are brittle, as if they were dry.
Also, i don't seem to get mold on my fingers, but i'm not sure that the white powdery mold should be visible with the bare eye.

Any way, i will look for a fungicide, i don't live in USA so probably i can't find Captan, but something similar should work just fine.

Thank you for your response and forgive me for my bad english

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Old 08-05-2013, 12:40 PM   #5
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Your new leaves are terribly yellow. Are you sure that you don't have a nutrient deficiency? This can be caused by an actual lack of nutrients or by soil pH outside the ideal range.

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Old 08-05-2013, 12:58 PM   #6
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I've started fertilize them in june (i know, it was a little late ) with 15-15-15 granulated fertilizer, but my Cascade plant is very good looking, dark green, and full of cones. Shouldn't all the plants look the same if it was a nutrient deficiency, keeping in mind that they are planted in the same garden?
Sadly i don't know the pH of the soil and, for now, i don't have a pH meter or something similar to measure it.
I have read that wood ash can help if you have nutrient-poor soil, i will try that to.

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Old 08-05-2013, 02:52 PM   #7
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Looks like mold to me. Mix up some baking soda, vegetable oil, and water and spray at dusk. Wont hurt anything if it's not mold. I sprayed mine and it fixed the problem right up. As someone mentioned earlier it does appear that they have some nutritional deficiencies.

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Old 08-05-2013, 02:58 PM   #8
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I will do that. I have also some CuSO4, wich is a very good fungicide, a might use it.
About the fertilizing, how often should i do it? As i said i have some 15-15-15 NPK granulated fertilizer...and how much to use per plant?

Sorry for the noobie questions

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Old 08-05-2013, 03:03 PM   #9
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15-15-15 should work, when they are still growing they really need a lot of Nitrogen though(the first number).

The Miracle grow i used was 24-8-16.

For that i mixed a gallon of water with a half Tbsp (half of their recommended dosage) and watered each plant with that once a week for two weeks they came back and took off.

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Old 08-05-2013, 03:05 PM   #10
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You can make effective fungicides at home, they're ridiculously priced if you buy them at the store. I wouldn't fertilize too much, only thing I've done is sprayed miracle grow once this year. I'd say do it once and see how they react, you have to let them grow. If you spray anything I'd make sure to do it later in the afternoon to prevent burn.

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