Plant Disease Basics 2 Flashcards
What are the three general symptoms of disease?
-Weekened or killed tissue.
- Abnormal in cell growth
- Whole plant apperance: Blight, stunted, dwarfing, wilts.
Do all disease symptoms spread?
No. They can either be localized (stick to one area) or systemic (spread throughout the plant).
What are primary and secondary symptoms?
Primary symptoms are at the infectious site and result in a direct response to the pathogen.
Secondary symptoms are a result of primary symptoms ex—wilting, chlorosis, etc.
What is Blight?
It is a rapid decline of different parts of the plant. Parts of the plants start dying off.
What kind of pathogen causes blight?
Bacteria
What kind of pathogen causes leaf spots and fruit spots?
Bacteria
What are the signs of leaf spots and fruit spots?
legions in the leaves or fruit that have the yellow halo around them.
What kind of pathogen causes canker?
Fungi
Where in the plant does canker occur?
Trunk, branches, and stems.
What are some signs of canker?
Cracked lesions on twigs, kills the weedy part of the tree.
What kinds of pathogens cause mosaic?
Viruses
What is the sign of mosaic?
Leaves look like a mosaic of green, light green and yellow.
What is the sign of corks?
Corky texture on plant roots.
Briefly describe the disease damping off.
This disease leads to the death of seedlings caused by the decomposition of roots and stems.
What kind of a pathogen caused damping off?
Fungi
What kind of a pathogen causes galls?
Bacteria, fungus, nematode or other organisms.
What are the signs of Galls?
Abnormal swelling or localized outgrowth.
What kind of pathogens cause soft rots?
fungi and bacteria
What is soft rots?
It is rotting of plant tissue as a result of fungal or bacterial infection. It affects the entire plant.
What are angular leaf spots?
They are similar to lesions on a leaf but the spots are angular.
What causes dieback?
Several abiotic factors like nutrition, water, weather and stem diseases, root diseases etc.
What is a sign of dieback?
The plant dies back from newest growth to oldest growth.
What disease is water soaking?
It is similar to angular leaf spots but instead of dead tissue, it looks like little water marks on the leaves.
What is a sign of scab disease?
Crstaceous lesions on all parts of the plant.
