The two natural insecticides used before $1940$
Pyrethrum and rotenones
Pyrethroids and nicotine
Pyrethrum and azadirachtin
Pyrethrum and squill
It’s obvious.
The first natural insecticides discovered by chinese was
‘Devine’ and ‘Collego’ are two agricultural substances that are used as
Which of the following is not an organo-chlorine
Turpentine oil is obtained from
Pyrethrin is extracted from
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