Pathology jasmine

JASMINE PLANT:Jasmine is a genus of shrubs and vines in the olive

family (Oleaceae). It contains around 200 species native to tropical and

warm temperate regions of Europe, Asia, and Africa.Jasmines are widely cultivated for the characteristic

fragrance of their flowers.This easy-to-grow climber produces beautiful clusters

of starry flowers you can smell from feet away.Most jasmines bloom in late winter or early spring,

but some such as Arabian jasmine will flower throughout the year.

JASMINE PLANT:

DISEASES OF JASMINE PLANT:Bacterial disease of jasmineFungal disease of jasmineThere is no viral disease of jasmine plant.

Bacterial disease of Jasmine:BACTERIAL BLIGHT:

CAUSATIVE AGENT: Pseudomonas syringae Pseudomonas syringae is a rod-shaped,

Gram-negative bacterium with polar flagella. It can infect a wide range of species. P. syringae is a member of the Pseudomonas genus. P. syringae also produces Ina proteins which cause

water to freeze at fairly high temperatures, resulting in injury to plants.

SCIENTIFIC CLASSIFICATION:Kingdom: Bacteria Phylum: Proteobacteria Class: Gamma Proteobacteria Order: Pseudomonadales Family: Pseudomonadaceae Genus: Pseudomonas Species: P. syringae

CULTURE OF Pseudomonas syringae:

HOSTS:Pseudomonas syringae is responsible for a

number of economically important diseases in the Pacific Northwest.

This bacterium can infect a wide variety of fruits, vegetables, and ornamental plants.

SYMPTOMS:A variety of symptoms are associated with

woody plants infected by Pseudomonas syringae.

Flower blast: flowers and/or flower buds turn brown to black.

Dead dormant buds, common on cherries and apricots.

Necrotic leaf spots (entire clusters of younger, expanding leaves may be killed on filbert trees).

Discolored and or blackened leaf veins and petioles resulting from systemic invasion and infection.

CONT…..Shoot-tip dieback, which appears as dead,

blackened twig tissue extending down some distance from the tip.

SOURCES OF BACTERIA:

On or in bud and twig tissue In cankers formed the previous season In or on grasses and herbaceous weeds

TRANSMISSION:Pseudomonas syringae can be moved from

place to place by wind, rain, insects, infested bud wood, and transportation of infested nursery stock.

Mechanical equipment and pruning tools also may be a frequently overlooked means of dispersal or of generating aerosols containing the bacteria.

CONTROL:

Do not use infected plants as stock or sources of bud wood.

Avoid planting susceptible species in frost-prone areas.

Avoid fertilization practices that result in very succulent growth in the early spring or in the fall.

Prune in the winter or very early spring. Disinfect pruning shears between plants.

FUNGAL DISEASE:1-Southern Blight:This is soil-borne fungal infection is also called mustard-seed fungus, Southern wilt or stem rot. Tiny, hardened masses of fungal spores (sclerotia) that resemble mustard seeds may be found in the soil around the jasmine plant, and white, threadlike structures appear above the soil line.

CAUSITIVE AGENTSCLEROTIUM ROLFSII: Sclerotium rolfsii, an omnivorous, soilborne fungal pathogen. In culture, the whole area of a petri plate is rapidly covered with mycelium, including

aerial hyphae which may cover the lid of the plate.

SYMPTOMS:1) The first symptom you see will be yellowed, wilting lower leaves, even though the fungus .2) White thready mycelium spread in stem and roots.

CONTROL: Southern blight is difficult to control. Prevention is the best course of action in the garden. 1)Check new plants for mycelium threads before planting. 2)Remove mulch from around the plant, since the fungus can overwinter in this material.

3)Sanitize garden tools before pruning away blighted areas of the jasmine, and destroy cuttings away from the garden.

4) No fungicides are available to control southern blight. If the jasmine is severely infected, remove and destroy it.5) Plant resistant ornamental plants in the jasmine's place

Pythium and Rhizoctonia: Also called damping-off, Pythium primarily attacks the jasmine's roots, while Rhizoctonia can infect all parts of the plant.

CAUSITIVE AGENT:Pythium and Rhizoctonia

SYMPTOMS:1)Infected roots soften and darken, and new shoots on the plant may grow in distorted or turn brown and lifeless.2) Plants experience slow growth, decline and may eventually die.

TRANSMITION:Poor soil drainage, limited air circulation, heavy rainfall or overhead irrigation may all contribute to spread of this disease.

PREVENTION:Prevention is the best course of action in the garden.1) Check new plants for mycelium threads before planting. 2)Remove mulch from around the plant, since the fungus can overwinter in this material. 3)Sanitize garden tools before pruning .4) No fungicides are available to control southern blight. If the jasmine is severely infected, remove and destroy it.