BLACKSPOT – Thuốc trừ sâu sinh học,thuốc trừ nấm,thuốc trừ rầy,thuốc diệt chuột
blackspot 4
Cây Cảnh - Bonsai

BLACKSPOT

Posted On June 8, 2017 at 9:38 am by / 74 Comments

BLACKSPOT ON ROSE PLANT


CAUSAL ORGANISM:

Diplocarpon rosae: This disease may also be called leaf spot, leaf blotch, star sooty mold and several other names. It is the most important disease of outdoor roses on a world wide basis. The fungus has probably been widely distributed with the cultivated rose and no really complete resistance is believed to exist.

SYMPTOMS:

Small black spots of 2 mm diameter can be found on upper leaf surfaces as well as immature canes. These spots are black and sooty enlarging to 12 mm with generally circular appearance but having a feathery edge. Further development involves the appearance of yellow margins around the spot and a yellow condition that can extend into the entire leaf. Late in the growing season defoliation can occur along with purple red, raised irregular blotches on immature wood.

DISEASE CYCLE:

The fungus usually over winters on infected leaves and canes as a mycelial mat rarely producing the perfect or sexual stage. As temperatures rise in the spring the fungus produces conidia which are moved by air currents or splashing water to new developing and expanding leaves which are very susceptible. Conidia germinate under conditions of free moister and need free water conditions for at least seven hours in order for infection to occur. The fungus is considered an obligate parasite producing haustoria in the host cell. As the infection develops, the leaf spot expands taking on the characteristic black appearance and producing conidia as secondary inoculum. Usually the lower and inside areas of the plant are more likely to be infected because these areas have longer time periods when free water is available on leaf surfaces allowing the germination and penetration of the fungus. Several cycles of infection and production of secondary inoculum can occur throughout a growing season.

CONTROL:

Dormant pruning, removal of attached leaves and cleaning up old leaves under the bushes can do much to reduce the over wintering inoculum. A well aerated site will do much to reduce disease incidence by preventing the occurrence of free water on the foliage for long time periods. Pruning to allow air movement and watering without wetting the foliage could also be important means of prevention. Some roses may be more resistant than others, but specialized races of the fungus quickly arise. When conditions are favorable in early spring, protectant sprays can be used on a one week interval or after periods of rain to prevent infection. Surfactants may allow the active materials to spread more evenly on plant surfaces and persist longer during periods of precipitation.

blackspot 1

blackspot 2

blackspot 3

REFERENCES:

Horst, R. K. 1983. Compendium of Rose Diseases. The American Phytopathological Society, St. Paul, Minnesota. Pp.7-11 and Color Plates 8-11.

Facebook Comments

74 thoughts on “BLACKSPOT

  1. There are definitely numerous particulars like that to take into consideration. That may be a nice point to carry up. I supply the ideas above as common inspiration but clearly there are questions like the one you deliver up the place the most important thing will probably be working in sincere good faith. I don?t know if greatest practices have emerged round things like that, however I’m positive that your job is clearly recognized as a good game. Both boys and girls feel the influence of only a moment’s pleasure, for the rest of their lives.

  2. I must express my appreciation to you for rescuing me from this dilemma. Right after researching throughout the world wide web and meeting methods which were not beneficial, I assumed my entire life was done. Existing without the strategies to the difficulties you have fixed by way of the article is a crucial case, as well as ones which may have adversely affected my entire career if I had not encountered your blog post. Your good training and kindness in playing with all the stuff was precious. I don’t know what I would have done if I hadn’t come across such a step like this. I’m able to at this moment look forward to my future. Thank you so much for your specialized and results-oriented help. I will not be reluctant to refer your blog to anybody who needs and wants guide on this situation.

  3. Keep up the incredible work !! Lovin’ it!
    EXPERTUTLATANDE
    Manga man lider av otillracklig penisstorlek. Det kan finnas olika orsaker, inklusive alder, ofta weight, ohalsosam eller otillracklig naring, brist pa vila, brist pa hormoner, alkohol och nikotin missbruk och annat can a woman get a sex change. Alla leder plow samma resultat: nedgang i kvaliteten pa sexlivet.
    Under de senaste 20 aren har can a woman get a sex change jag sett crew i alla aldrar och livsstilar med detta problem. Vi lyckades hitta det perfekta botemedlet in behalf of att hjalpa dem. Namligen Titan Gel! At the beck kliniska provningar har det visat sig vara effektivt aven i de svaraste situationerna.
    Bout kan verkligen rekommendera Titan Gel opna.allformens.nl/stor-svensk-penis/can-a-woman-get-a-sex-change.php can a woman get a sex change till alla mina patienter som den basta losningen. De som redan har provat det uppskattar det mycket!

  4. Terrific Web page, Continue the fantastic job. Thank you so much.

    EXPERTUTLATANDE
    Manga gentleman lider av otillracklig penisstorlek. Det kan finnas olika orsaker, inklusive alder, ofta weight, ohalsosam eller otillracklig naring, brist pa vila, brist pa hormoner, alkohol och nikotin missbruk och annat. Alla leder farm samma resultat: nedgang i kvaliteten pa sexlivet.
    Subsumed under de senaste 20 aren har toot sett crew i alla aldrar och livsstilar med detta problem. Vi lyckades hitta det perfekta botemedlet for att hjalpa dem. Namligen Titan Gel! Under the aegis kliniska provningar har det visat sig vara effektivt aven i de svaraste situationerna.
    Jag kan verkligen rekommendera Titan Gel reuflat.levafriska.se/gratis-sex-dejting/sex-change-process.php sex change process work alla mina patienter som den basta losningen. De som redan har provat det uppskattar det mycket!

  5. Whoa this is a good online site.

    EXPERTUTLATANDE
    Manga mortals lider av otillracklig penisstorlek. Det kan finnas olika orsaker, inklusive alder, ofta weight, ohalsosam eller otillracklig naring, brist pa vila, brist pa hormoner, alkohol och nikotin missbruk och annat. Alla leder plow samma resultat: nedgang i kvaliteten pa sexlivet.
    Supervised de senaste 20 aren har jag sett fellow i alla aldrar och livsstilar med detta problem. Vi lyckades hitta det perfekta botemedlet in behalf of att hjalpa dem. Namligen Titan Gel! Underneath kliniska provningar har det visat sig vara effektivt aven i de svaraste situationerna.
    Bout kan verkligen rekommendera Titan Gel unru.levafriska.se/gratis-sex-dejting/meet-korean-girls.php meet korean girls cash-box alla mina patienter som den basta losningen. De som redan har provat det uppskattar det mycket!

  6. I have been absent for some time, but now I remember why I used to love this site. Thanks , I’ll try and check back more often. How frequently you update your web site?

  7. You’ve great information at this point.

    EXPERTUTLATANDE
    Manga mortals lider av otillracklig penisstorlek. Det kan finnas olika orsaker, inklusive alder, ofta stress, ohalsosam eller otillracklig naring, brist pa vila, brist pa hormoner, alkohol och nikotin missbruk och annat. Alla leder farm samma resultat: nedgang i kvaliteten pa sexlivet.
    Subsumed under de senaste 20 aren har jag sett crew i alla aldrar och livsstilar med detta problem. Vi lyckades hitta det perfekta botemedlet for att hjalpa dem. Namligen Titan Gel! Under the aegis kliniska provningar har det visat sig vara effektivt aven i de svaraste situationerna.
    Jag kan verkligen rekommendera Titan Gel ntabdie.levafriska.se/women/girls-looking-for-couples.php girls looking for couples work alla mina patienter som den basta losningen. De som redan har provat det uppskattar det mycket!

  8. How are you, good websites you possess in here.

    EXPERTUTLATANDE
    Manga handcuff lider av otillracklig penisstorlek. Det kan finnas olika orsaker, inklusive alder, ofta pressure, ohalsosam eller otillracklig naring, brist pa vila, brist pa hormoner, alkohol och nikotin missbruk och annat. Alla leder till samma resultat: nedgang i kvaliteten pa sexlivet.
    Below de senaste 20 aren har bout sett man i alla aldrar och livsstilar med detta problem. Vi lyckades hitta det perfekta botemedlet looking for att hjalpa dem. Namligen Titan Gel! Under the aegis kliniska provningar har det visat sig vara effektivt aven i de svaraste situationerna.
    Binge kan verkligen rekommendera Titan Gel irer.tobehealthy.se/fotos/maedchen-zur-frau.php madchen zur frau work alla mina patienter som den basta losningen. De som redan har provat det uppskattar det mycket!

  9. I love looking at your site. Thanks for your time!
    EXPERTUTLATANDE
    Manga mortals lider av otillracklig penisstorlek. Det kan finnas olika orsaker, inklusive alder, ofta pressure, ohalsosam eller otillracklig naring, brist pa vila, brist pa hormoner, alkohol och nikotin missbruk och annat treatment for chronic prostatitis without infection. Alla leder farm samma resultat: nedgang i kvaliteten pa sexlivet.
    Under de senaste 20 aren har treatment for chronic prostatitis without infection toot sett fellow i alla aldrar och livsstilar med detta problem. Vi lyckades hitta det perfekta botemedlet looking for att hjalpa dem. Namligen Titan Gel! Under kliniska provningar har det visat sig vara effektivt aven i de svaraste situationerna.
    Jag kan verkligen rekommendera Titan Gel conku.allformens.nl/cream-for-the-penis/treatment-for-chronic-prostatitis-without-infection.php treatment for chronic prostatitis without infection work alla mina patienter som den basta losningen. De som redan har provat det uppskattar det mycket!

  10. Thank you so much for sharing your superb web site.

    EXPERTUTLATANDE
    Manga handcuff lider av otillracklig penisstorlek. Det kan finnas olika orsaker, inklusive alder, ofta weight, ohalsosam eller otillracklig naring, brist pa vila, brist pa hormoner, alkohol och nikotin missbruk och annat. Alla leder till samma resultat: nedgang i kvaliteten pa sexlivet.
    Below de senaste 20 aren har bout sett fellow i alla aldrar och livsstilar med detta problem. Vi lyckades hitta det perfekta botemedlet looking for att hjalpa dem. Namligen Titan Gel! Underneath kliniska provningar har det visat sig vara effektivt aven i de svaraste situationerna.
    Jag kan verkligen rekommendera Titan Gel website downgo.tobehealthy.se/16-inch-penis/pes-no-penis.php pes no penis harrow alla mina patienter som den basta losningen. De som redan har provat det uppskattar det mycket!

  11. You have got one of the greatest web-sites.

    EXPERTUTLATANDE
    Manga gentleman lider av otillracklig penisstorlek. Det kan finnas olika orsaker, inklusive alder, ofta pressure, ohalsosam eller otillracklig naring, brist pa vila, brist pa hormoner, alkohol och nikotin missbruk och annat. Alla leder farm samma resultat: nedgang i kvaliteten pa sexlivet.
    Supervised de senaste 20 aren har toot sett the human race i alla aldrar och livsstilar med detta problem. Vi lyckades hitta det perfekta botemedlet in place of att hjalpa dem. Namligen Titan Gel! Under kliniska provningar har det visat sig vara effektivt aven i de svaraste situationerna.
    Toot kan verkligen rekommendera Titan Gel website poscock.tobehealthy.se/titan-gel-nebenwirkungen/anstraengningsastma-behandling.php anstrangningsastma behandling till alla mina patienter som den basta losningen. De som redan har provat det uppskattar det mycket!

  12. Awesome site you’ve right here.
    EXPERTUTLATANDE
    Manga mortals lider av otillracklig penisstorlek. Det kan finnas olika orsaker, inklusive alder, ofta weight, ohalsosam eller otillracklig naring, brist pa vila, brist pa hormoner, alkohol och nikotin missbruk och annat male chest hair removal. Alla leder plow samma resultat: nedgang i kvaliteten pa sexlivet.
    Supervised de senaste 20 aren har male chest hair removal binge sett the human race i alla aldrar och livsstilar med detta problem. Vi lyckades hitta det perfekta botemedlet in behalf of att hjalpa dem. Namligen Titan Gel! At the beck kliniska provningar har det visat sig vara effektivt aven i de svaraste situationerna.
    Binge kan verkligen rekommendera Titan Gel erbo.allformens.nl/gel-penis-man/male-chest-hair-removal.php male chest hair removal till alla mina patienter som den basta losningen. De som redan har provat det uppskattar det mycket!

  13. Great website! It looks really professional! Sustain the great job!

    EXPERTUTLATANDE
    Manga man lider av otillracklig penisstorlek. Det kan finnas olika orsaker, inklusive alder, ofta importance, ohalsosam eller otillracklig naring, brist pa vila, brist pa hormoner, alkohol och nikotin missbruk och annat. Alla leder till samma resultat: nedgang i kvaliteten pa sexlivet.
    Supervised de senaste 20 aren har toot sett the human race i alla aldrar och livsstilar med detta problem. Vi lyckades hitta det perfekta botemedlet looking for att hjalpa dem. Namligen Titan Gel! At the beck kliniska provningar har det visat sig vara effektivt aven i de svaraste situationerna.
    Toot kan verkligen rekommendera Titan Gel website irer.tobehealthy.se/fotos/prostatahyperplasi-symtom.php prostatahyperplasi symtom work alla mina patienter som den basta losningen. De som redan har provat det uppskattar det mycket!

Leave a Reply

Your email address will not be published.