Solanum melongena L.

Images:

Symptoms

Stunting of plants, yellowing, wilting, and drying of leaves.  And may lead to death of plants.

More reading…

1. www.oisat.org/crops/vegetables/eggplant.html
2. www.omafra.gov.on.ca/IPM/english/…/verticillium-wilt.html
3. www.webindia123.com/garden/vegie/eggplant.htm

Alternaria solani

Images:

Symptoms

Leaves turn yellow, wither, and drop from plants. Tomato plant severely infected by early blight produce low yields of undersized fruit.

More reading…

1. http://www.nysaes.cornell.edu/ent/hortcrops/english/eblight.html
2. www.infonet-biovision.org/default/ct/86/pests
3. www.daehnfeldt.com/file_upload/40.PDF

Symptoms include yellowing and wilting of the lower leaves and the entire plant. Plants become stunted when infected at a younger age. Some of the leaves may then collapse at the leaf stalk and hang down.

saline soils

Images:

Symptoms

Plants are stunted with brown leaf edges, seeds do  not  germinate, and flower and fruit yields are poor/reduced

More reading…

1. http://www.fao.org/docrep/r4082e/r4082e08.htm
2. http://images.google.co.ke/images?hl=en&um=1&q=Salty+Soils&sa=N&start=20
3. http://www.sunset.com/garden/garden-basics/salty-soils-00400000020417/

Images:

Symptoms

There is no single symptom of infection by virus. Signs include stunted growth, deformed leaves and flower buds, and white lines across flowers. Pale green or yellow patches on leaves.

More reading…

1. http://www.dpvweb.net/intro/index.php
2. http://en.wikipedia.org/wiki/Plant_virus
3. http://www.microbiologybytes.com/virology/Plant.html

Tobamovirus .

Images:

Symptoms

Stunted/underdeveloped, distorted, small leaves and plants.

More reading…

1. http://en.wikipedia.org/wiki/Tobacco_mosaic_virus
2. http://www.extension.umn.edu/distribution/horticulture/DG1168.html
3. http://www.bio-medicine.org/biology-definition/Tobacco_mosaic_virus/
4. http://www.inra.fr/hyp3/pathogene/6tmv.htm

Magnaporthe grisea

Pyricularia grisea

Images:

Symptoms

Lesions that can be found on all parts of the plant, including leaves, leaf collars, necks, panicles, pedicels, and seeds.

More reading…

1. http://www.riceblast.org/
2. http://en.wikipedia.org/wiki/Magnaporthe_grisea
3. http://www.cbwinfo.com/Biological/PlantPath/PyG.html
4. http://www.oisat.org/pests/diseases/fungal/rice_blast.html

Mycosphaerella fijiensis; M. musicola

Images:

Symptoms

Tiny, spots with brown lines appear on the bottom  of the 3rd or 4th open leaf. Lines  become darker with  a purple shade.  The lesions then enlarge, becoming dark to give the characteristic black lines of the leaves with a water-soaked appearance

More reading…

1. www.bioversityinternational.org/Publications/Pdf/699.pdf
2. http://www.oisat.org/pests/diseases/fungal/sigatoka_leaf_spot.html
3. http://easyweb.easynet.co.uk/~andreaj/sigatoka2.htm
4. http://www2.dpi.qld.gov.au/horticulture/5247.html

Rosa multiflora

Images:

Symptoms

Stunted plants , twisted, and distorted leaves, reduced yields especially plants that are affected at a young stage.

More reading…

1. http://ipm.illinois.edu/diseases/series600/rpd666/index.html
2. http://www.research4development.info/SearchResearchDatabase.asp?ProjectID=2239
3. www.rose-roses.com/problems/otherdiseases.html

Armillaria

Images

Symptoms

Leaves  start to die, usually on one side; the tree dies from the top down. It  mainly occurs when plants are overwatered and the roots are deprived of oxygen leading to rotting.

More reading…

1. http://en.wikipedia.org/wiki/Root_rot
2. http://www.ppath.cas.psu.edu/extension/plant_disease/pythrrot.html
3. http://www.gardeningknowhow.com/problems/treating-root-rot-gardening-tips-for-housplants.htm
4. www.chasehorticulturalresearch.com/pdfs/armillaria_root.pdf