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Biotic Diseases. Biotic Diseases. They can be caused by: 1. Nematodes 2. Viruses 3. Bacteria 4. Parasitic higher plants 5. Fungi. Nematodes are wormlike in appearance but taxonomically different from true worm.

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biotic diseases2
Biotic Diseases

They can be caused by:

1. Nematodes

2. Viruses

3. Bacteria

4. Parasitic higher plants

5. Fungi

slide3

Nematodes are wormlike in appearance but taxonomically different from true worm.

They live freely in fresh or salt waters or in soil and feed on microorganisms, plants and animals.

1 soybean cyst nematodes heterodera glycines
1.Soybean cyst nematodesHeterodera glycines

Plant: Soybean

Parasite: Heterodera glycines

slide5

Symptoms:

The root system of the infected plants appears smaller with fewer bacterial nodules and clusters of cyst nematodes.

Infected soybean are stunted and their leaves turn yellow and fall off early.

2 stem and bulb nematodes ditylenchus dipsaci
2.Stem and bulb nematodesDitylenchus dipsaci

Plant: Stem and bulb of plants

Parasite: Ditylenchus dipsaci

slide7

Symptoms:

Infected tuber:

lesions appear on the tuber as small brown blemishes. On the cut surface, the underlying tissues appear granular and spongy. The blemishes grow larger and the final stage is expressed by mummification of the tuber.

Infected bulb: Curled green leaves and the scales becomes softened, loose and pale gray in color.

Infected bulb may be split and become malformed, odorless and light in weight.

1 diseases caused by tobacco mosaic virus
1.Diseases caused byTobacco mosaic virus

Disease name: Mosaic virus

Plant: Tobacco

Pathogen: Tobacco mosaic virus

slide10
Symptoms:

Various degrees of chlorosis, curling, distortion, dwarfing of leaves, flowers and entire plants.

2 diseases caused by tomato mosaic virus
2.Diseases caused byTomato mosaic virus

Disease name: Mosaic virus

Plant: Tomato

Pathogen: Tomato mosaic virus

slide12

Symptoms:

Leaflets may be long and pointed, sometimes shoestring-like.

Internal browning of fruits.

3 diseases caused by hordeiviruses
3.Diseases caused by hordeiviruses

Disease name: Barley stripe mosaic virus (BSMV)

Plant: Barley (Hordeum spp.), grain crops and wild grasses

Pathogen: hordeivirus

slide14
Symptoms:

Chlorotic spots, yellow-brown strips and sometimes dwarfing and necrosis of plants.

4 diseases caused by lettuce mosaic virus
4.Diseases caused by Lettuce mosaic virus

Disease name: Mosaic virus

Plant: Lettuce

Pathogen: Lettuce mosaic virus

4 diseases caused by lettuce mosaic virus16
4.Diseases caused by Lettuce mosaic virus

Disease name: Mosaic virus

Plant: Lettuce

Pathogen: Lettuce mosaic virus

slide17
Symptoms:

Mottling (yellowing of leaves), distortion and marginal necrosis of leaves, dwarfing of plant and failure to produce lettuce head.

5 disease caused by sugarcane mosaic virus
5.Disease caused by sugarcane mosaic virus

Disease name: Sugarcane mosaic virus

Plant: Sugarcane, other gramineae (corn, sorgum,…)

Pathogen: Sugarcane mosaic virus

slide19
Symptoms:

Pale patches and twisted distorted leaves.

Necrotic and stunted stems.

6 disease caused by papaya ringspot virus
6.Disease caused by Papaya ringspot virus

Disease name: Papaya ringspot virus

Plant: Papaya

Pathogen:Ringspot virus

slide21
Symptoms:

Yellow mosaic leaves with stunting of the plant.

Fruit: Dark green and slightly sunken rings with unpleasant taste.