More RRD Victims... do symptoms show up with heat?
braverichard (6a, North MO)
6 years ago
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Patty W. zone 5a Illinois
6 years agohenry_kuska
6 years agoRelated Discussions
Leaf symptoms - what am I doing wrong?
Comments (6)milocrab, you have got me all over the globe - Hong Kong, Asia, Australia! About your seedlings; the growing medium appears too heavy for a tiny mustard seed and you may have compounded the problem by your watering program. A seed needs to be in a moist environment to imbibe moisture in its own sweet time. If the medium is too wet the seed will rot. As the seed germinates it uses up its stored energy to produce a root and shoot. These are necessarily small, definitely immature and very sensitive to the environment. Application of fertilizer and exposure to (sun)light must be done carefully and gradually or the seedling can easily die. All of the leaves in the photographs show a nutritional problem; either a shortage of elements or else a problem with uptake if the elements are present. Overwatering can prevent uptake by displacing oxygen at root level The bleached areas on some leaves can be caused by sudden and perhaps extreme exposure to (sun)light; or damage due to the activity of the "blotch" (as opposed to the "serpentine") leafminer. 91ðF "even for one hour" to us can mean "for an entire hour?" to a seedling as it pulls on all of its meagre reserves to cope with this environmental stress. Allow me to reproduce from memory, a poem by Kate Brown from my kindergarten school days. "In the heart of a seed, buried deep, so deep; A dear little plant lay fast asleep. "Wake!" said the sunshine, "and creep to the light". "Wake!" said the voice of the raindrops bright. The little plant heard it And rose to see. What the wonderful Outside world might be." We had to mime as we recited and it is a pleasamt memory....See MoreSome specific RRD symptoms
Comments (37)The following statement was made: "I asked him if we can extrapolite mite behaviour from one mite to another in the same genus; his answer was no." H.Kuska comment. Of course each species has its own unique characteristics. This is probably why each species is so selective as to which plant it feeds on. James W. Amrine has coauthored a review article titled: "Behavioural studies on eriophyoid mites: an overview" This review indicates (to me) that eriophyoid mites have characteristics in common such that it is worth while to write a general review. But of course they also have differences. Concerning feeding it states: "Finally, after landing on the host and discriminating whether it is a proper one, the eriophyoid mite can start to feed. After probing, which takes several seconds, the mite takes a typical feeding stance, i.e. it slightly bends its body and anchors the rostrum to the host surface and contracts the telescopic palpal segments, which allows protrusion of the cheliceral stylets for a short distance into the plant tissues (Krantz 1973; Gibson 1974; McCoy and Albrigo 1975; Nuzzaci 1976). Information concerning the feeding behaviour of eriophyoid mites was summarized by Westphal and Manson (1996) and no new detailed data have been provided since." http://link.springer.com/content/pdf/10.1007%2Fs10493-009-9319-2.pdf --------------------------------------- I consider Dr. Raymond A. Cloyd (Professor and Extension Specialist in Ornamental Entomology/Integrated Pest Management Department of Entomology at Kansas State University, to be one of the mite experts among rose rosette virus interested scientists. " Rose rosette is vectored or transmitted by the eriophyid mite, Phyllocoptes fructiphilus, which is native to North America. Phyllocoptes fructiphilus is robust, spindle-shaped, and yellow to brown in color, 140 to 170 microns in length, and approximately 50 microns in width. The mite has four legs, which differs from other mite species that typically have eight legs. Mites may be observed with the use of 10X hand-lens or high-powered (200X) microscope. The mites are typically located in the angles between leaf petioles and axillary buds. Adult mites overwinter on rose canes between partly opened buds and the angles between rose stems and petioles. Phyllocoptes fructiphilus needs living, green tissue in order to survive. In early spring, the mites migrate onto developing shoots where females lay eggs. Females may live up to 30 days; laying one egg per day. Young mites develop within the leaf folds of new shoots or under leaf petioles. The mites may move from plant-to-plant via attaching to insects. They may also be dispersed via air currents (wind) from infested rose plants. Mites may start a new infection, by feeding on the succulent, rapidly growing tissues, after landing on an un-infected garden plant or multiflora rose." H.Kuska comment. Please note: "by feeding on the succulent, rapidly growing tissues," http://www.ars.org/wp-content/uploads/2012/04/Dr-Cloyd-Rose-Rosette-Disease-April-2011.pdf Here is a link that might be useful: link for Dr. Cloyd's article...See MoreAn RRD report
Comments (19)Oh my! Such a nice group of responses to my post. And I thought I was the only one visiting this forum during the holiday weekend. anntn6b - I'll have to get up to speed on the terminology ('abnormal' is about as technical as I get) but will take your advice and look for the doohickies you mentioned. The asymmetrical leaves will sometimes have lobes (think of mittens with one or two thumbs). These lobed leaves are found directly under or very close to the rose bud itself but not in a compound set. The compound sets, however, will sometimes have an uneven number of leaves or be asymmetrical from one side of the stem to the other. And some sets show the beginnings of a spiral - perhaps a 90 degree turn. I'm thinking these are early signs of RRD - especially in conjunction with other signs or when I see more than one occurrance on the same cane. My garden is a no-spray zone. Not because of any principle but mostly because I'm a lazy girl. My roses have been selected for hardiness and disease resistance. I've learned to tolerate or squish the bugs and my robust feeding & watering seems to take care of the rest. The more I look at my roses the more I see signs of RRD - or maybe I'm just paranoid. My cats and other family members are worried that I'll see signs of RRD in them and take the pruners to 'em. I suspect that RRD has been in my garden for at least 3 years. It was nice to be blissfully unaware of the situation but I can't go back to that. Have a lovely weekend everyone, Karol...See MoreToday I lost 6 more roses to RRD
Comments (21)BBG had RRD in a corner of their gardens and didn't even identify the disease for some time (until we visited and explained to them what it was.) I think their idea of companion planting is a good one, but they haven't been doing it long enough to prove anything, yet. If you've visited BBG, you remember that the garden is surrounded by a city with multistory buildings. Their disease pressure would probably be low to begin with. There might be wild roses in within five miles, but it's only when you get down to the shore of the sound that Rosa multiflora becomes a major plant. The one thing that we can do is notice which plants aren't getting RRD when all roses around them are getting sick. I've written about R. bracteata having leaves that the vector mite doesn't recognize as rose, so the vector leaves. I think another thing that might help is roses that go semi-dormant in summer and early fall, so that the mites can't reach undifferentiated meristemic tissues in the bud axils. If you have a tall structure that had RRD on it, (see the bit in the e-book about my friend's New Dawn) and the replacement rose gets RRD, then that structure is doing air flow things that drop the mites. That becomes a clematis or passion flower or other great climber place. I have been growing the native Amethyst Falls wisteria, whose pale lavender blue flowers look really good with OGR pink roses. And Amethyst Falls does repeat a bit and blooms several weeks after the more common foreign version. What more do I know now? I know that the scientists at U. Arkansas have isolated the RRD virus; that makes it RRV. I know that it's continuing to spread. I think there may be some suggestions as to the origin of the disease. I know I'm thankful that so many of us are willing to share and work together and compare notes. Here is a link that might be useful: Amethyst Falls...See Morebraverichard (6a, North MO)
6 years agohenry_kuska
6 years agomyermike_1micha
6 years agoPatty W. zone 5a Illinois
6 years agolast modified: 6 years agobraverichard (6a, North MO)
6 years agoPatty W. zone 5a Illinois
6 years agomyermike_1micha
6 years agoBuford_NE_GA_7A
6 years agohenry_kuska
6 years agoBuford_NE_GA_7A
6 years agoValRose PNW Wa 8a
6 years agolast modified: 6 years agohenry_kuska
6 years agolast modified: 6 years agoPatty W. zone 5a Illinois
6 years agoValRose PNW Wa 8a
6 years agolast modified: 6 years agoBuford_NE_GA_7A
6 years agoPatty W. zone 5a Illinois
6 years agoValRose PNW Wa 8a
6 years agolast modified: 6 years agobraverichard (6a, North MO)
6 years agohenry_kuska
6 years agoPatty W. zone 5a Illinois
6 years agobraverichard (6a, North MO)
6 years agohenry_kuska
6 years agoDave5bWY
6 years agoPatty W. zone 5a Illinois
6 years agoDave5bWY
6 years agoPatty W. zone 5a Illinois
6 years agoerin sos (5b/6a) Central/West. Mass
6 years agohenry_kuska
6 years agohenry_kuska
6 years agolast modified: 6 years agoValRose PNW Wa 8a
6 years agoerin sos (5b/6a) Central/West. Mass
6 years agobraverichard (6a, North MO)
6 years agoPatty W. zone 5a Illinois
6 years agobraverichard (6a, North MO)
6 years agoValRose PNW Wa 8a
6 years agobraverichard (6a, North MO)
6 years agoDave5bWY
6 years agocountrygirlsc, Upstate SC
6 years agolast modified: 6 years agohenry_kuska
6 years agoPatty W. zone 5a Illinois
6 years agobraverichard (6a, North MO)
6 years agoValRose PNW Wa 8a
6 years agoBuford_NE_GA_7A
6 years agoValRose PNW Wa 8a
6 years agocountrygirlsc, Upstate SC
6 years agoVaporvac Z6-OhioRiverValley
6 years agolast modified: 6 years agohenry_kuska
6 years ago
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