Cannabis growers often use the insecticide pyrethrins to control pest species and protect their crops. These come from a natural source—flowers of the chrysanthemum plant. Various forms of ...
Gaddum, E. W., Ann. Rep. Senior Agric. Officer (Pyrethrum) in Ann. Rep. Dept. Agric., Kenya, 80 (1949). Gaddum, E. W., Ann. Rep. Senior Agric. Officer (Pyrethrum) in ...
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