<Li> Chitosan: a plant in the presence of this product will naturally induce systemic resistance (ISR) to allow the plant to defend itself against disease, pathogens and pests . </Li> <Li> Biopesticides may include natural plant - derived products, which include alkaloids, terpenoids, phenolics and other secondary chemicals . Certain vegetable oils such as canola oil are known to have pesticidal properties . Products based on extracts of plants such as garlic have now been registered in the EU and elsewhere . </Li> <P> Biopesticides are biological or biologically - derived agents, that are usually applied in a manner similar to chemical pesticides, but achieve pest management in an environmentally friendly way . With all pest management products, but especially microbial agents, effective control requires appropriate formulation and application . </P> <P> Biopesticides for use against crop diseases have already established themselves on a variety of crops . For example, biopesticides already play an important role in controlling downy mildew diseases . Their benefits include: a 0 - Day Pre-Harvest Interval (see: maximum residue limit), the ability to use under moderate to severe disease pressure, and the ability to use as a tank mix or in a rotational program with other registered fungicides . Because some market studies estimate that as much as 20% of global fungicide sales are directed at downy mildew diseases, the integration of biofungicides into grape production has substantial benefits in terms of extending the useful life of other fungicides, especially those in the reduced - risk category . </P>

Name two substances used as biopesticides for storing grains