Patent ID: 8889197

Claim:
A synergistic combination for use in modulation of phytopathogenic infection comprising (a) an extract derived from a Reynoutria sp. plant, wherein said extract comprises one or more anthraquinone derivatives that induce plant resistance to phytopathogens, wherein said derivative (i) has the structure wherein R1, R2, R3, R4, R5, R6, R7 and R8 are hydrogen, hydroxyl, hydroxylalkyl, halogen, carboxyl, alkyl or sugar and (b) at least one chemical pesticide selected from the group consisting of a single site anti-fungal agent and a multi-site non-inorganic, chemical fungicide wherein the amounts of Reynoutria extract and at least one chemical pesticide in said combination provide for synergism of modulation of phytopathogenic infection, wherein the synergism is measured by determining E/E e and E/E e is at least 1.2.