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12 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Name the 3 agents affecting plant productivity |
Weeds,disease and pests |
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What are weeds? |
Weed is any plant growing where it is not needed |
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List 5 harmful effects of weeds |
Weeds compete with cultivated crops for nutrients, space and light. Weeds harbour pests and attack plants. . They lower the quality of your produce.Weeds are parasitic to plants.They secrete poisonous substances . Weeds are parasitic to plants.They secrete poisonous substances They secrete poisonous substances |
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List 7 mechanical methods of weed control |
Hand picking, hoeing,tillage,flooding, burning, mulching, ploughing |
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List 3 cultural methods of weed control |
Crop rotation, crop competition and mulching with organic material |
Use the pictures to help you |
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Give q biological control method of weeds |
The use of parasites to feed on weeds |
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How does the melaleuca sawfly (lophyrotoma zonalis) impact trees negatively? |
It defoliates trees, robbing them of the resources needed to produce flowers. |
Its a parasite. |
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chemical control as used in weed control |
The use of weedicides or herbicides to control weeds |
Example: gramoxone, round up |
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Define disease |
An impairment of the normal state of a plant that interrupts or modifies its vital functions |
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What are some disease caused from fungi and what plants do they affect \ attack? |
Damping off: affects seedlings in nursery. Early blight: affects tomatoes Leaf spot: bananas Sooty mould: citrus, mango |
Use this to help you |
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What are some disease caused by bacteria and what plants do the affect? |
Soft rot: carrots Brown rot: tomatoes, peppers Bacterial wilt: potatoes (Irish) tobacco Scab of potato: irish |
This will help you |
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What diseases are caused from a virus and what are the plants they affect? |
Mosaic: sugar cane, pawpaw, peas and beans Panama disease: banana Lethal yellowing: coconut Curly tops: beet root |
This will help you |
