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6Microbesus BiocontrvlAgents., Riocontol refers to the use biological, of, methods, methods, , for controlling plant discases, wly on natural predation rather, and pests; these, than on the introduced chemicals., An oganic gardener worKS to create a system, wliere the insects (that arc, pests) are not eradicated,, are, kept, at, but, manageable levels by a conplex, system of checks and balances, within the, eosystem., eThe beneficial predatory and parasitic insccts which depend on, these insect pests are able to, survive; for example the Ladybird bectle, is useful to get rid of aphids, and dragonflies, , control, mosquitoes., Bacillus thuringiensis is a bacterium_whose spores are, toxic to certain insect larvac and kill them,, but is not harmful to other insects., The toxin-producing genes of this bacterium are transferred (genetic engineering) into crop plants,, which become resistant to insect pests; Bt cotton an example., is, biological, control being developed for treatment/control of plant diseases is the fungus, Another, Trichoderma, which is free-living in the soil and root ecosystems and is effective against several, plant pathogens., , are Pathoans that atacK inSeeti and, agents_belmg, , Baculoviduses, Cmtrel, ethah athroporls, Us el as bioltgieal., Microbes in Human Welfare 221, inthe enus Nueleopoly-hedoo via, Thege viruies are, excelet Candidatns for Speies Specitic.