Blackspot: organic prevention and remedies.
Vaporvac Z6-OhioRiverValley
7 years ago
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Vaporvac Z6-OhioRiverValley
7 years agoRelated Discussions
Organic remedy for iris leaf spot?
Comments (3)Okay, so I'm impatient and found this online: If you want to use a non-chemical spray, the American Iris Society recommends the following: To a gallon of water, add three (3) tablespoons baking soda, two (2) tablespoons of shavings from a bar of Ivory soap, and one (1) tablespoon vegetable oil. Apply the spray to infected parts of the plant. This does prevent mildew, and may work on leaf spot as well. Prevention is the best cure, so if you are in a moisture prone area, to avoid fungal leaf spot it is best to plant irises in full sun, in a rich well drained soil, also try to select disease resistant varieties, and do not water with overhead watering systems (I use a weeping soaker type garden hose system)....See Morecalifornia article - blackspot (mainly organic)
Comments (2)seil, how long was your Actinovate trial, and did you start before blackspot appeared? The one Actinovate label that I found listed mildew but not blackspot for roses. Here is a link that might be useful: Actinovate label...See MoreJapanese Beetles & Blackspot - How to prevent?
Comments (2)To carry kimmsr's thoughts further: 1) ALWAYS water at the soil line and 2) properly prune the roses to maximize air circulation through the plant. You can view tutorials by googling 'pruning roses.' These practices will help control blackspot, JB that's another problem which can be controlled. Google 'integrated pest management' for help....See Moreblackspot and climate changes
Comments (16)Sammy, Florida has a huge blackspot problem because of the warmth and humidity. My friend Harold says it's impossible not to spray in their region. They have problems with blackspot and a particular nematode which will kill every single one of their roses unless they are grafted onto Fortiana root stock. What blackspot doesn't afflict is the dry, arid and hot zones of California and Arizona. I still say that one shouldn't water the leaves if one can help it. Sammy, do you experience wilt leaves if you stop watering the leaves and just water the roots? Have you ever tried this? or have you always kept on watering the leaves. You might try an experiment--2 same-type roses. One with the watered leaves and one without. You see I did a similar experiment to assess Vitamin B1 root nourisher versus my Gardenville Sea Tea. I had identical transplanted lavender plants in the same soil. One I gave Vitamin B1 nourisher and the other I gave sea tea. The Vitamin B1 did very absolutely nothing; the Sea Tea created a boom in growth, vitality and number of leaves. The only way is to do controlled experiments in one's own garden. I have 2 identical Lincolns, same soil. Next spring I will do 2 different kinds of foliar feeds to see which one is the most protective against the blackspot. I think what Maureen is saying is that keeping leaves dry is pointless if one has bunches of rain anyway. But! what both articles say is that if you keep the leaves dry as much as you can possibly control-- that indeed will keep the blackspot from spreading. Dew, Maureen does not count! Dew only lasts briefly, about one hour and as soon as the sun rises it dries! Dew will not cause blackspot because it dries so quickly. Blackspot takes several hours of wetness before it starts to spread. Both articles really stress that it is important to keep moisture away from the leaves as much as possible. There are certain things you can't control. If it's gonna keep raining for days, you will get the blackspot. The article gives specifics on the hours in between that blackspot will take to spread. Whether it be a span of greater than 7 hours of dryness (blackspot won't spread). However! if you have a resistant variety of rose, the slower the spread of the blackspot. If you combine watering the leaves then a few hours later it rains, you are actually increasing the time of wetness, making it opportune for the blackspot to have its ideal conditions....See MoreEmbothrium
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