A number of DNA based methods have been developed for characterization: specific primed polymerase chain reaction (PCR); Random amplified polymorphic DNA (RAPD), DNA: DNA colony hybridization and rRNA-based probe [15]. These methods can distinguish individual strains and isolates, allowing the tracking of the environmental fate of strains used for pest control. Such methods can also be used to identify the presence/absence of specific endotoxin genes, which mean it is possible to establish whether a particular strain has lost or acquired specific δ- endotoxin genes in the environment. The products contain the spores and parasporal crystals of Bti H-14 serotype which must be ingested by the larval stage of the mosquito to cause mortality.