Crop Protection 3.3 Flashcards

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1
Q

What is crop growth affected by

A

Weeds, invertebrates and diseases

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2
Q

How do weeds affect crop growth

A

Unwanted plants that: Reduce productivity due to competition; release chemicals which inhibit growth of the crop; contaminate grain crops with their seeds; act as hosts for diseases and crop pests

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3
Q

What are 3 types of invertebrate

A

Insects, molluscs, nematode worms

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4
Q

What are plant diseases caused by

A

Bacteria, viruses, Fungi

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5
Q

What are the 2 types of weeds

A

Annual and Perennial

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6
Q

What are annual weeds

A

Colonise fields prior to crop growth by: fast growth rates, short life cycles, producing large numbers of seeds viable for long periods of time

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7
Q

What are perennial weeds

A

Live for more than 2 years; in possession of storage organs to provide food if growing conditions aren’t ideal; reproduce by vegetative reproduction

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8
Q

How can you control weeds, other pests and diseases

A

Cultural methods and chemical methods

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9
Q

What are cultural methods of protection

A

Non-chemical methods of preventing the problem organisms from establishing and affecting the crop

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10
Q

What are examples of cultural methods

A

Ploughing, weeding and crop rotation

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11
Q

What is ploughing

A

Top layer of soil is turned over to bury perennial weeds (which die and decompose)

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12
Q

What is weeding

A

Weeds are removed early in life of the crop, enabling the crop to get a head start and be better at out-competing weeds at a later point

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13
Q
A
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