Abstract
Because of a number of factors, there is considerable interest in the use of biological pesticides to control a wide range of pests. Several products based on varieties of Bacillus thuringiensis (Bt) are preferred over chemicals for the control of agricultural and forestry pests and insect vectors of disease in some environmentally sensitive areas. New Bt strains are now being developed for the control of beetles and other pest species and genetic engineering is allowing the introduction of genes coding for Bt toxins into other microorganisms and plants. The latter approach has caused concern that plants containing such genes may exacerbate the potential for insect resistance to Bt toxins, even though such toxins are offering ways to manage resistance to conventional insecticides. However, advances in the discovery of new and novel Bt toxin genes and in fermentation and formulation techniques hold great promise for future new products to control many of the world's pest problems.
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