The earliest pesticide was
Margosa
Pyrethrum
Nicotine
$DDT$
(a)One of the earliest pesticides used by man was Margosa $(neem) $ leaves.
They are proteinous infectious agents.
Which one of the following is pest of tobacco
The two natural insecticides used before $1940$
Mode of action of following pesticides is similar
First bioinsecticide to be developed on commercial scale was
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