Black spot of Rose
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This document summarizes information about the black spot disease of roses caused by the fungus Diplocarpon rosae. It affects rose plants worldwide, causing black spots on leaves that later yellow and drop off, defoliating the plant. The fungus produces two types of spores, ascospores and conidia, that are spread by wind and water to infect new leaves. Environmental conditions like continuous leaf wetness for 7 hours enable the disease to develop and spread. Management involves removing infected leaves, keeping foliage dry, applying fungicide sprays, and growing roses in sunny locations.
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Plant pathogen
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2) Black rot turns infected berries into hard, black "mummy" structures covered in black fruiting bodies. Anthracnose creates "shot-hole" lesions on leaves and bird's eye spots on berries.
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Black spot of rose is caused by the fungus Diplocarpon rosae. The fungus overwinters on infected leaves and stems. In spring, it produces spores that are spread by rain splash, infecting new leaves. Repeated infection cycles occur throughout the growing season. Young leaves are most susceptible. Preventive measures include fungicide sprays in spring before growth and regularly during the season. Cultural practices like good air circulation and not overcrowding plants can also help control the fungus. Breeding programs are developing rose varieties with resistance to black spot.
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Neem (नीम) is a Hindi noun derived from Sanskrit Nimba (निंब).
Neem is a fast-growing tree that can reach a height of 15–20 metres (49–66 ft), and rarely 35–40 metres (115–131 ft).
It is evergreen, but in severe drought it may shed most of its leaves or nearly all leaves
The branches are wide and spreading.
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3. Management involves cultural practices like crop rotation, as well as chemical controls like fungicides or resistant varieties depending on the specific disease. Maintaining proper growing
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Panama disease
Moko disease
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Presentation1 aloevera disease
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Tangerine cultivar is highly susceptible.
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Classification, Characterization and identification of Ditylenchus dipsaci
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Black spot of Rose
- 1. BLACK SPOT OF ROSE STUDENT COURSE TEACHER Karthick M.S Dr. Parthasarathy. S ID.NO:2015021055 Asst. Prof. (Plant Pathology)
- 2. • Disease name: Black spot of Rose Pathogen name: • Anamorph : Marssonina rosae. • Teleomorph: Diplocarpon rosae.
- 3. SYSTEMATIC POSITION • Kingdom : Fungi • Phylum : Ascomycota • Class : Leotiomycetes • Order : Helotiales • Family : Dermateaceae • Genus : Diplocarpon • Species : D. rosae
- 4. Significance: •The disease is found everywhere rose plant are planted, typically in epidemic proportion. •The water borne dispersal methods allow it to infect a plethora of plants every growing season and increases the overall incidence of disease. •Diplocarpon rosae does not kill the rose itself, it is known to completely defoliate the leaves of plant.
- 5. PATHOGEN DESCRIPTION: • Acervuli bear the hyaline two celled fusiform conidia. • Perithecium bears the asci which contains 8 ascopores.
- 6. SYMPTOMS: • Black spots, one-tenth to one-half inch in diameter, develop first on upper leaf surfaces. • Areas adjacent to the black spots turn yellow and leaves drop prematurely, usually beginning at the bottom of the plant and progressing upward. • Less commonly, raised purple-red blotches develop on immature wood of first year canes. • These spots may later become blackened and blistered.
- 8. MODE OF SPREAD: • Primary spread : Through Ascospores from perithecia. • Secondary spread : Wind borne conidia. MODE OF DISPERSAL: • The fungal spores germinate in the spring and are disseminated by splashing water.
- 9. FAVOURABLE CONDITION: • Fungal spores on the leaf surface must be continuously wet for at least seven hours for infection to occur. • Once infection is established, the fungus will develop fruiting bodies called acervuli in black lesions which, in turn, produce spores that splash to new tissue, spreading the disease.
- 10. Management: • Remove diseased leaves. • Keep the foliage dry. • Spray chlorothalonil (Daconil), mancozeb or maneb. • Limit the disease by growing roses in locations where they receive morning or, preferably, all day sun.