1.   For example, the bacterium Bacillus thuringiensis has the ability to produce crystalline spores which act as natural insecticides.

2.   Apparently, the killer ingredient is the natural insecticide rotenone, which occurs in plants.

3.   BT, a natural insecticide that organic farmers spray on crops, kills bugs quickly before evaporating.

4.   In theory, that would reduce the chances of a super insect evolving that could resist the natural insecticide.

5.   One of them is True Stop, a liquid cow manure-based product that also contains rotenone, a natural insecticide derived from plant roots.

6.   The modified crops pump out Bt toxin, a natural insecticide created by bacteria.

7.   He charged that Bt corn, a variety genetically engineered to produce a natural insecticide, will cause irreparable harm to organic farmers.

8.   The young couple grew pyrethrum, a daisy-like flower whose oil is a natural insecticide.