L4 Flashcards
Fire blight Pathogen
Erwinia amylovera
Fire blight 🔥
Host
Apple 🍎 and pear 🍐
On blossom, flora receptacles, ovary & peduncle. Eventually tissues shrivels & turn black.
Fire blight
Citrus canker Pathogen
Xanthomonas campestris
Necrotic die-back, premature fruit drop & blemishes. (Severely infected) weak, unproductive, unprofitable.
Citrus canker
Bacterial blight
Pathogen
Xanthomonas axonopodis
Bacterial blight
Host
Pomegranate
Under favorable conditions spots enlarge to become raised, dark & crack
Bacterial blight
Bacterial mosaic
Pathogen
Clavibacter michiganense (sups.Tesselarius)
Bacterial mosaic
Host
Wheat 🌾
The pathogen attacks triticale. This mosaic effect is produced by uniformly distributed small yellow lesions, with ill defined margins
Bacterial mosaic
Bacterial speck
Pathogen
Pseudomonas syringae
Bacterial speck host
Tomato
Black specks, yellow halo. Expansion of leaf tissue
Bacterial speck
Bacterial wilt
Phathogen
Pseudomonas solancearum
Wilting of the foliage followed by collapse. Yellowing
Bacterial wilt
Yellow vine disease
Phatogen
Serrata mrcescence
Yellow vine disease
Host
Cucurbits
Terminal leaves stand erect, fail to expand. Margin curls. ((Older leaves)) develop scorched margins & may die. Eventually the roots decline & die
Yellow vine disease
Tobacco mosaic virus TMV genus
tobamovirus
Tobacco mosaic virus TMV
Host
Tobacco
ssRNA, rigid helical shape. Extremely stablestructure
Tobacco mosaic virus TMV
Cauliflower mosaic virus (CaMV)
Caulimovirus
Cauliflower mosaic virus (CaMV) host
Cauliflower
Icosahedral. dsDNA.
virus (CaMV)
Multilayered capsid
Cauliflower mosaic virus (CaMV) host
Tomato yellow leaves curl virus TYLCV phathogen
B eg om o v i ru s
Tomato yellow leaves curl virus TYLCV host
Tomato
Twinned morphology.
One of the most devastating viral diseases. More severe @ early age. Curling leaves, chlorotic leaves 🍁 reduced size & stunt
Tomato yellow leaves curl virus TYLCV
