Divya Lakshmi PAT.pptxDivya Lakshmi PATt

Divya Lakshmi PAT

1. DISEASE OF CARNATION DIVYA LAKSHMI .P 2021022028

2. MAJOR DISEASES : Fusarium wilt - Fusarium oxysporum f.sp.dianthi Bacterial wilt – Burkholderia caryophylli Alternaria leaf spot – Alternaria dianthi MINOR DISEASES : Rust – Uromyces dianthi Bacterial slow wilt – Erwinia chrysanthemi Charcoal rot – Macrophomina phaseolina Downey mildew – peronospora dianthicola Fairy ring spot – Mycosphaerella dianthi Carnation ring spot virus Carnation vein mottle virus Rhizoctonia stem rot - Rhizoctonia solani

3. FUSARIUM WILT: Fusarium oxysporum f . sp . dianthi SYMPTOMS: In young plants the first sign of the disease is fading or graying of the normal colour of the leaves with wilting of the leaves and young stems The vascular tissue of infected stems is stained dark brown Mature plants show wilt symptoms over a period of several months before they die and eventually become straw coloured

4. MODE OF SPREAD: Primary : chlamydospores in infected plant debris and soil Secondary: water borne pathogen PATHOGEN: Macroconidia Microconidia Chlamydospores

5. MANAGEMENT: The diseased plants should be removed immediately after noticing the disease complete root system and surrounding soil should be dug out and disposed off carefully Soil solarization using clear transparent polyethylene film for 30 days gives satisfactory control

6. BACTERIAL WILT: Burkholderia caryophylli SYMPTOMS: Bluish black colour discoloration appears on affected stem portions leads to drying of plant Bacterial ooze out comes out from the affected areas of the stem

7. MODE OF SPREAD: Primary : infected suckers Secondary: bacterial carried by irrigation water PATHOGEN: Rod shaped gram negative bacteria with single polar flagellum

8. MANAGEMENT: Disease plant debris should be collected and burnt Disease free planting materials are to be used . cultivars – elegance, Northland and starlite are less susceptible to bacterial wilt

9. ALTERNARIA LEAF SPOT: Alternaria dianthi SYMPTOMS: Reddish brown colour spots with thick margin and presence of pale yellow centre appears on both leaves and unopened flower bud MODE OF SPEAD : Primary: Through Ascospores Secondary : Wind borne conidia

10. MANAGEMENT: Disease free planting material can be used planting material should be dipped in Bacillus subtilis 2g/ litre of water

11. RUST: Uromyces dianthi SYMPTOMS: Carnation rust first appears as an indistinct yellowing of the leaves and stem soon turning into an elongated raised brown spot which yields brown dust when rubbed MANAGEMENT: Preventative control includes the use of rust- free cuttings sterilization of border soils and careful maintenance of greenhouse ventilators to prevent damp patches occuring in the crop

12. CARNATION RING SPOT: SYMPTOMS: In severe infections or in susceptible carnation cultivars leaf tip necrosis can also be observed MANAGEMENT: The most effective control is by eradication of virus in plant shoots or meristems by chemotherapy and thermotherapy is routinely accomplished to produce certified virus free nuclear stocks