الفهرس يوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
Revjew of /jrer:ature
INTRODUcTIO
Biological p seicides are becoming recognized a an
important factor in crops and forest protection and in insect
vector control, These pesticides are natural, disease causing
microorganisms such as viru es, bacteria and fungi, which infect
specific pet group. Bacterial insecticides, especially Bacillus
thurtngiensts have become important factors ill insect control
programs because of their efficacy and safety. (Spear, 1987).
Bacillus thuringiensis (B:t.) is a living microorganism that
kill certain in ece and i II ed to kin unwanted insect in
forests, agriculture and urban areas. In a purified, farm, SOUle of
the proteins produced by B. thuringiensis are actually toxic to
mammals. However, in their natural farm, acute toxicity of
commonly-used B. thuringiensis varieties is limited to
caterpillars mosquito larvae. and beetle larvae B. thuringiensis
is closely related to .8. cereus, a bacterial that causes food
poisoning and to B. anthracies, the agent of the disease anthrax.
Pew studies have been conducted 011 the chronic health effects
carcinogenicity 01 mutagenicity of B, thnringiensis. ( wadener,
1994). B. thuringiensis isa species of bacteria that has
insecticidal propertie affecting a electi e range of insect
OId rs. There are at 1 ast 34 nb species of B. thuringiensis
(De Barjac, et al., 1990) also called serotype or varieties) and
probably over 800 strain isolates (Ellis. 1991) B. thuringtensts
was first isolated in 1901 in Japan from diseased ilk worm
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