Help with unusual problem for knockout rose
Cynthia Harrington
11 days ago
last modified: 11 days ago
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Comments (7)
Cynthia Harrington
11 days agoCynthia Harrington
11 days agoRelated Discussions
Double knockout roses doing poorly Help!
Comments (6)Hi again, There are a couple of possible issues here. Spraying anything in warm, dry weather has the potential to burn foliage. Be sure to DEEP water the day before spraying anything or giving any sort of drench. Spray in the early morning or evening when the day is coolest. Spraying Neem or other 'organic' insecticides can also burn foliage in hot weather because they contain oils. Your roses will have aphids every spring. I promise! Spring = aphids. Aphids are best controlled by squishing (very satisfying to the gardener) or blasting with a strong stream of water from a garden hose (more effective). Treating aphids with insecticide is a mistake, it sets your roses up for infestation by spider mites and spider mites are MUCH more difficult to kill. Aphid damage is cosmetic, they don't really harm your bushes. Since you've already used pesticide, relax, you won't automatically have spider mites but for heaven's sake don't use any more pesticide on your roses. I'm thinking that you used fungicide because yellowing leaves with spots sounds like blackspot. In central Texas you won't see BS on Knockout roses. Maybe some wimpy rose like Iceberg or Lagerfeld would BS in Texas but not Knockout. Your humidity level is too low and your summers are too hot. I think your roses defoliated due to spray burn. How can you best help your poor naked roses? Water, water, water. Your roses should be deep watered twice a week to grow & bloom nicely. Any week that you receive two inches of rain, don't water. If it rains less than two inches a week in summer, water. If it rains less than an inch a week in fall, water. Water, water, water. You have several chemical products formulated for roses in your garage and your Knockouts don't need them. Go to the garden center and buy a hybrid tea rose so you have a rose to nurture. You sound like a very nice person and you truly want to care for your roses but Knockout only needs water....See Morerose virgin needs help identifying illness in knockouts
Comments (12)Spider mites. Please stop using the insecticide immediately. It does not kill the mites but does kill the insects that would naturally eat the mites thus you have a big mite population explosion. The very best thing that you can do is to buy a water wand for your garden hose and wash your roses every day for a week or so. Using the water wand, you can reach the underside of the leaves where the mites live. Since your Knock-Outs are in a hot, dry location (ideal for spider mites), you will need to wash the foliage weekly for the rest of the summer. Good luck!...See Morehelp knockout rose is dying
Comments (11)It would help a great deal if we knew where you lived and what kind of weather conditions you've been experiencing. If the cane is still green where those leaves have dried up you do not need to cut the can off. The leaves will replace themselves once the problem is solved. If the canes themselves are turning brown or black then they need to be removed down to good green cane. Do examine the plant carefully to see if there are any insects on it or any damage to the canes. Dig below the surface and see what's going on down there. Is it bone dry or swampy? Either of those could cause die back. Hold the canes at the top and try and rock the plant back and forth. If it moves easily and freely there could indeed be something eating the roots. Come back with more info on what you find and maybe we can get more specific with our help....See MoreKnockout Rose Issue - Please Help!!
Comments (21)I know I'm not near any of you and this thread is older, but ALL of my roses are KO's... and my pink doubles have black spot on them. We just went through an F2 tornado here in Vilonia, Arkansas that destroyed the neighborhood. Our house, although very heavily damaged, is liveable and the KO's??? THEY MADE IT THROUGH with just their blooms blown off and some twisting! BUT... the TORRENTIAL rains from the tornado and sussequent flash flooding (of which NO flooding hit us) have really brought out the black spot. I simply prune lightly the branches affected and leave them alone and they will return to glory when the spring weather calms down. At least I know they can withstand 160 mph winds!...See MoreMoses, Pittsburgh, W. PA., zone 5/6, USA
10 days agolast modified: 10 days agorosecanadian
10 days agomad_gallica (z5 Eastern NY)
10 days agoCynthia Harrington
10 days ago
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