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30 Cards in this Set
- Front
- Back
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A disease |
A disorder of structure/function that produces specific symptoms or affects a specific location |
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7 ways to identify diseases |
Stunted growth Spots on leaves Area of decay Growth Malformation Discolouration Pests |
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Stunted Growth |
Nitrate deficiency |
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Spots on leaves |
Black spot fungus |
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Areas of decay |
Blights on potatoes |
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Growths |
Bacterial infevtion |
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Malformation |
Aphid / nematode infection |
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Pests |
Aphids - caterpillar |
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4 responses to plant diseases |
Pesticides Fertiliser Removal Anti Fungal |
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Pesticides |
Aphids and insects |
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Fertiliser |
Nitrate and magnesium deficiency |
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Removal |
TNV and bacterial disease |
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Antifungal |
Black spot and Botrytis |
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Rose Black Spot is what type of disease |
Fungal Caused by Diplocarpon Rosae |
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Affect of rose black spot |
Changes leaf colour to black/purple Reduces ability to photosynthesise Result : Death |
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Treatment of Rose Black Spot |
Anti Fungal Spray |
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Bacterial Plant Disease |
Pseudomonas Synges |
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affect of pseudomonas synges |
Produces discoloured leaves (reduced ability to photosynthesise) Increases susceptibility of frost damage |
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Viral disease |
Tobacco mosaic virus |
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TMV affects what |
Tobacco and tomato plants |
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Affects of TMV |
Discoloured patterns (look like mosaics) ^reduces ability to photosynthesise |
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TMV spreading |
Good at surviving without heat Can remain in soil and infect others |
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Nematode Worms |
Small multicellular worm like animals Live freely in soils and harmless to plants Others are parasites |
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Aphids |
Tiny inspects Suck sap from stems (often in roses) Reduce rate of plant growth and encourage them to wilt and leaves to discolour and curl Eaten by lady birds |
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Mistletoe |
Is a parasite and steal from their host Eaten by birds droppings are dropped onto branches which contain seeds, seeds stick and germinate Send root like structures into the branches and into its water transport system |
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Plant Defence Responses |
Cell wall Waxy cuticle Large stems |
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Cell wall |
Thickened with cellulose to strengthen and provide structure and also act as a barrier to resist infection |
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Waxy Cuticle |
Acts as a barrier |
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Large stems |
Thick layer of dead cells this forms bark that falls off taking pathigens with it |
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After infection - plant response |
Natural occuring antibacterial Mint and witch hazel |
