Plant disorders Flashcards

1
Q

What is meant by the term plant disorder?

A

Physiological disorders

Disorders not caused by pests or disease but by some problem in the environment in which the plant is being grown.

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2
Q

How are plants affected by frost

A

Frost causes cells to freeze, contents expand, cell ruptures and is killed. Plants blacken and die. This happens to non hardy plants as a matter of course.
Damaging to young shoots and tips and buds reducing production of flowers and fruit.

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3
Q

State one method of avoiding frost damage

A

Provide protection such as straw, fleece,cloches etc or bring tender plants under cover.

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4
Q

Describe how plants are adversely affected by shade.

A

Etiolation with long weak stems, small sparse leaves, pale yellow.

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5
Q

How to avoid problems associated with shade

A

Grow plants that are suitable for the position they are going to occupy.

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6
Q

Describe how plant growth is adversely affected by drought.

A

Foliage will start to wilt and turn brown. Then they may fall and plant eventually die.
Some run to seed.
Fruit will fail to set

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7
Q

Date how to avoid problems from drought.

A

Mulch
Water regularly
Increase water holding capacity of soil (long term)

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8
Q

Describe how plant growth is adversely affected by water-logging.

A

Leaves turn yellow and wilt
Growth stunted
Roots rot

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9
Q

State one method of lessening the affect of water-logging on plants

A

Improve the structure of the soil.

Drainage

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10
Q

Describe how plant growth is adversely affected by high/low temperature damage

A

Low temperatures tend to cause slow growth

High temperatures scorch leaves and drought may be caused

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11
Q

How to avoid damage from high/low temperatures?

A

Mostly a problem in greenhouses. Shade from strong sunlight.

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12
Q

Describe how plant growth is adversely affected by soil pH including lime induced chlorosis(iron deficiency/too alkaline)

A

Roots unable to absorb a balance of nutrients
Iron is not available to the plant (needed to produce chlorophyll) so leaves turn yellow or brown in margins and between veins.
Poor quality fruit and quantity

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13
Q

Describe how plant growth is adversely affected by fasciation.

A

Apical meristem becomes flattened and elongated and has appearance of many shoots together.
Can be caused by aphids or mechanical means.
Not necessarily fatal.

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14
Q

State new method of avoiding or dealing with fasciation.

A

Cut out the damaged part of plant.

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15
Q

Describe how plant growth is adversely affected by rose balling.

A

Outer petals of rose bud die and become stiff so inner petals cannot emerge. Buds go brown and drop off or can become covered in grey mould.

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16
Q

Methods of avoiding rose balling.

A

Good air circulation by not planting to close and running to give open centre.
Don’t overwater foliage
Remove damaged buds immediately.