2. Defintation of plantation crops:
A group of commercial crops of perennial nature,cultivated extensively in
tropical and subtropical situations which need employment of labour
throughout the year and the produces of which are usually consumed
after processing. e.g. tea,coffee,rubber etc.
12. How do synergists work?
Many pests have the ability to break down pesticide
chemicals, like pyrethrins, and bounce back from the initial
paralysis. Synergists slow or stop the break down process
and make the insecticides more toxic to the pest.
Synergists are chemicals that
make insecticide ingredients more effective at killing
pests. They generally are low in toxicity for humans.