KA3: CROP PROTECTION Flashcards
properties of the type of weed begining with P
Perineal
* live for more than 2 years
* possess storage to provide food if growing conditions aren’t ideal
* can reproduce by vegatative reproduction
crop growth is affected by…
three
- weeds
- invertebrates
- diseases
types of weed
names
annual
perinial
properties of the type of weed begining with A
Annual
* colonise fields proir to growth of crop
* fast growth rate
* short life cycle
* large number of seeds produced over a long period of time
name the types of vertebrates that crop growth is affected by
- insects
- molluscs
- nematode worms
plant diseases caused by
- fungi
- bacteria
- viruses
crop weeds
potential effects
- reduction in productivitiy 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
2 ways to control weeds, other pests & diseases
culteral- non-chemical methods
chemical- pesticides are employed
name the culteral methods of control of weeds, other pests & diseases
- ploughing
- removal of weeds
- crop rotation
ploughing
a top laye of soil is turned over to bury PERENIAL weeds (causing them to die and decompose)
removal of weeds
weeds are removed enabling the crop plant to gain a gead start and be better able to out compete weeds at a late point
crop rotation
a very different crop is grown in a field in succsessive years
prevents build up of pathogens
chemical
- a way to control weeds and other pests & diseases
- pesticides are employed
what are the types of chemicals employed
- insecticides
- nemat-icides
- fungicides
- herbicides
what type of chemical are insecticides, nematicides, fungicides?
definition of this, btw its not herbicides!
systemic
* kill pests feeding on plants through which chemical spreads
