Black Spot Roses Treatment

Hey, good afternoon, it's Jason from Fraser Valley rose farm. It's a bit of a wet afternoon on the farm Which makes it a good day for talking about black spot. Black spot is this stuff here you've seen it in your garden already it's a black splotches on the foliage of the rose and Usually yellow regions as well and you can see on the rose behind me here that it's affected more on the lower and older leaves Of the Rose you can see some yellow and some black back there. Whereas the upper leaves Are still relatively unaffected That's kind of the pattern that shows on these roses and the name of the game here right now at this stage in the season is to try to Prevent the reinfection from the lower foliage to move up to the upper foliage of the rose Can you Keep black spot out of your garden? The answer is kind of "no" - the black spot fungus Diplocarpon rosae is Ubiquitous, it's everywhere where roses are and it travels on the wind so at some point in your season your susceptible varieties will get black spot and your only control over it is to try to Either reduce it or reduce the severity of the infection And then clean it up afterwards. So it doesn't spread back and through your garden. So let me show you how to do that So once you have this infected tissue on your rose the name of the game is removal and I've seen people trying to do this by using snippers like this That's a pretty inefficient way of stripping the leaves from your rose the better way Every rose has every leaf has an abscission point where if you pull back and downwards on the stem It just detaches and that way it comes off quickly and Cleanly so you don't leave any of that black spot in behind The way this actually works is That each one of these leaves That's the mature stage of the fungus once it's poor you laits and sends spores around it requires moisture for The spores to germinate and what I heard was that seven hours of moisture is what it takes. So needless to say those people who live in a more arid climate and their foliage will dry off quicker after an irrigation have an advantage in the prevention of black spot Reinfecting their plants something that you can do in terms of trying to make it a little easier for your rows to dry out Is to prune with this in mind is to remove With or to remove the branches that grow to the inside of the rose and try to leave it open to air circulation into the rose Here at the base of the rose the same logic applies that if these leaves that have fallen from the rose Begin to sporulate and throw those black spots pores back up into the rose. You're going to get reinfected very quickly so it's important that when you're finished cleaning up your rose and This is particularly important post season like when your roses are going to sleep for the winter or fall that you take all of this old foliage the infected foliage and you get it out of here you clean it up thoroughly and There's some evidence that if you can put down a coarse organic mulch like woodchips at the base of your rose and Keep that freshened up after the cleanup But that will suppress The black spot fungus from jumping back up into your rose Okay, so it's all well and good to talk about how to try to clean up your roses and prevent subsequent reinfection of black spot but you may be asking at this point isn't there something I could do isn't there something I could spray perhaps that would prevent the black spot from appearing at all in my garden and My answer to that is I guess it depends on how serious you are about the problem. I tend to view black spot here as More of a cosmetic issue. It doesn't cause any major health effects to my roses Even though I'm in a climate that is a little bit moist - and I will see Some appearance a black spot on almost all of my roses throughout the year So I don't view it as a major problem. You can see in the rose behind me. It's got plenty of new growth coming I'm going to get plenty of new flowers from it because a strong vigorous rose and the black spot will just be a cosmetic annoyance to me However, if you are pretty serious about it Let's say you're trying to enter your roses and exhibitions and you really need to eliminate black spot from your garden and you're serious enough to consider the heavy duty fungicides and rotate through three or four of the most major chemical fungicides Then I say have go ahead and strap on your your respirator put on your spray suit and your heavy duty sprayer and and You know have fun, but be safe For me, it's not worth that level of effort (or risk). However, I will talk to you about four of the more natural alternatives that are on the market and by natural, I don't mean to say they're without risks entirely, but they are they have a widespread history of Abuse that is considered relatively safe and effective so the first one is copper now copper is generally applied in one of two different ways one as a winter mix of Bordeaux mix so this is after all your foliage has come off of your rose - you've stripped it off. You've cleaned done your cleanup of those fallen leaves around the base maybe you've put down your wood mulch and you want to make sure your roses come into the season clean, but they aren't carrying too many of those spores from season to season then you can spray it with Bordeaux mix. Bordeaux mix is like a Copper and lime solution that sticks to the leaves sticks to the sticks to the stems It can be slightly phytotoxic Which is why we put it on to the rose during the winter phytotoxic meaning that it could burn the leaves or cause some problems That way so that's the first way you'd apply copper The second one is tend to be called just copper Spray and it doesn't include the it isn't as heavy and it doesn't include that lime Component doesn't stick to your foliage quite so strongly and doesn't cause as much phytotoxicity so copper spray is a second one That one you can carry over not just over the winter season, but well into the spring the second option I'm going to talk about is sulfur or wettable sulfur. Sulfur has been used by humans to suppress fungal infections on crops for Thousands of years so it has a long history of use wettable sulfur you would put it as directed on the package into A mix of water and you would get a full cover spray up and down on your roses Now the caution about sulfur is that as it gets warmer like past 25 degrees Celsius I'll put in the fahrenheit equivalent. When I edit the video, then it can become phytotoxic again to the roses So it's again spring early summer not in the height of the heat of summer. The third option I talk about is neem and neem is like an oil extracted from the bark of the neem tree and it is also known for suppressing fungal diseases and Insects to some degree as well. So it might be a generally a good thing to apply to your roses But once again the caution is that it can be phytotoxic and high temperatures So neem is another of those shoulder sees and spring and fall type solutions and the final one I'm going to talk about and it's the one that I've mixed in this sprayer here is generally safe and effective It's a baking soda and horticultural oil mix now the baking soda I'm using in here is not Sodium bicarbonate - its potassium bicarbonate which can be a little harder to find I put a link to it in my Amazon store not that you have to buy it there, but just to give you an idea of which the ingredient is so potassium bicarbonate and Horticultural oil with just couple of drops of dish soap or a spreader sticker to make it stick onto the foliage of your leaves the actual recipe for that is that you use a teaspoon of The potassium bicarbonate you can substitute with sodium bicarbonate but it tends to be a little more phytotoxic the potassium bicarbonate of one teaspoon and a half a teaspoon of horticultural oil with just a couple of droplets of the spreader sticker or the dish soap into One liter or one quart of water from there. You put it into a sprayer like this and You give it a full coverage spray right to drip drip off onto the stripped foliage or stripped branches onto the new foliage up and down the shrub and It has some people have questioned whether this is effective as a spray and I did some reading on it but also I've been using it in my garden off and on and I guess my general impression is that it is Safe and effective that I've now, it's not it's not going to cure the black spots I don't think there's anything that you're going to spray on. It's actually going to get rid of black spots. That's only by manual removal But it will in my opinion reduce the incidence of infection So if you're coming into your season may be a good way to go about it if you're looking at these less harmful solutions is To do a strip down at the end of the season to strip off the old foliage do a Cleanup around the base put down a bark mulch do a winter spray of Borgo mix enter into the season either doing copper or neem oil sprays and Then when it gets to the height of the season like this doing a weekly or bi-weekly spray of that baking soda solution That I talked about might be a good way to reduce the base the black spot on your roses. All right I hope this answered some of your questions on black spot on roses if you have any questions comments Or just want to generally rant about how terrible it is leave those in the comments below. Thank you so much for watching

Channel: Fraser Valley Rose Farm

Views: 532,153

Rating: 4.8830276 out of 5

Keywords: black spot roses treatment, natural spray, rose disease, foliage black spot, leaf spot roses, rose growing, rose gardening, gardening ideas, gardening tips, rose gardening ideas, rose gardening tips, black spot spray, rose flower, gardening, fungicide spray, black spot on roses, black spot on rose leaves

Id: ulx5GyaHAZg

Length: 10min 29sec (629 seconds)

Published: Sun Jul 07 2019