(WO2019/067380) CLAIMS We claim: 1. A composition for treating viral and bacterial plant pathogenic diseases of a plant, the composition comprising a beneficial microorganism and/or a growth by-product thereof, wherein the microorganism is a non-pathogenic biosurfactant-producing yeast or bacteria, and the growth by-product is a biosurfactant. 2. The composition of claim 1 , wherein the yeast is Starmerella bombicola or Wickerhamomyces anomalus. 3. The composition of claim 1 , wherein the bacteria is Bacillus subtilis or Bacillus amyloliquefaciens . 4. The composition of claim 1 , comprising fermentation broth in which the microorganism and/or growth by-product was produced. 5. The composition of claim 4, comprising the fermentation broth without the microorganism. 6. The composition of claim 1 , wherein the biosurfactant is a glycolipid or lipopeptide. 7. The composition of claim 6, wherein the glycolipid is selected from sophorolipids, rhamnolipids, mannosylerythritol lipids, and trehalose lipids. 8. The composition of claim 6, wherein the lipopeptide is selected from surfactin, iturin, lichenysin and fengycin. 9. The composition of claim 6, wherein the biosurfactant is a sophorolipid at a concentration of 0.1 % to 0.5%. 10. The composition of claim 1 , further comprising an adherent substance. 1 1. The composition of claim 10, wherein the adherent substance is a polysaccharide selected from xanthan gum at a concentration of 0.001 % (w/v). 12. A method of treating viral and bacterial plant pathogenic diseases, the method comprising contacting a composition comprising a beneficial microorganism and/or a growth product thereof to a plant affected by a viral or bacterial pathogen. 13. The composition of claim 12, wherein the viral pathogen is a mosaic virus. 14. The method of claim 12, wherein the composition is applied to the plant's leaves or foliage. 15. The method of claim 12, wherein the beneficial microorganism is a biosurfactant- producing yeast or bacteria. 16. The method of claim 15, wherein the yeast is Starmerella bombicola or Wickerhamomyces anomalus. 17. The method of claim 15, wherein the bacteria is Bacillus subtilis or Bacillus amyloliquefaciens. 1 8. The method of claim 12, wherein the composition comprises fermentation broth in which the microorganism and/or growth by-product were produced. 19. The method of claim 18, wherein the method comprises contacting the fermentation broth, separated from the beneficial microorganism, with the plant. 20. The method of claim 12, wherein the growth by-product is a glycolipid biosurfactant or a lipopeptide biosurfactant. 21. The method of claim 20, wherein, wherein the glycolipid is selected from sophorolipids, rhamnolipids, mannosylerythritol lipids, and trehalose lipids. 22. The method of claim 20, wherein the hpopeptide is selected from surfactin, iturin, lichenysin and fengycin. 23. The method of claim 20, wherein the biosurfactant is a sophorolipid at a concentration of 0.1% to 0.5%. 24. The method of claim 20, further comprising applying an adherent substance to the plant alongside the composition. 25. The method of claim 24, wherein the adherent substance is a polysaccharide. 26. The method of claim 25, wherein the polysaccharide is xanthan gum at a concentration of 0.001% (w/v). 27. The method of claim 12, wherein the composition is a composition of claims 1-9.
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