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Higher biology
UNIT 3
Crop protection
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Gleannah San Diego
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Cards (9)
What reduces productivity in crop protection?
weeds
competing with plants
pests
and
diseases
damaging plants
What is an annual weed?
A
weed
that
completes
its
life
cycle
within
one
year.
What properties do weeds have?
rapid growth
A
short life cycle
high seed output
long term seed viability
Whats a perennial weed?
A weed
that
lives
for
many
years.
and
are
dormant
in
winter
and
once
spring
comes
they
grow again.
what are properties of perennial weeds?
competitive adaptions
that allow them to compete with cultivated plants
producing
sexually/asexually
due to
storage organs
under grown storage organs will grow into another weed even if the surface plant itself had been removed
What are the pests of crop plants?
invertebrates
such as
insects
(
mollusks
,
nematode worms
an
slugs
)
What are plant diseases caused by?
pathogens
,
fungi
bacteria
or
viruses
often carried by
invertebrates
What are methods of crop protection?
ploughing
, weeding, the crop
rotation
are all
cultural
methods in controlling weeds,
pests
and
diseases
. (non chemical methods of control)
What are chemical methods of crop protection?
using
pesticides
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