Patent ID: 8435571

Claim:
A method for treating plants comprising applying 0.25 g/L to 2 g/L of a biological plant protective agent to a plant under field or glasshouse conditions, wherein the biological plant protective agent comprises an extract dissolved or suspended in water and wherein the extract is obtained by the following steps: (i) drying aerial parts, including flowers, of Agapanthus africanus at 30-40° C. to the exclusion of sun light; (ii) grinding the dried plant material of part (i) to a grit size less than 0.1 mm; (iii) soaking the ground material of part (ii) with methanol to form a suspension/solution; (iv) stirring the soaked material of step (iii) and separating the methanol-soluble supernatant; (v) evaporating the solvent from the supernatant of part (iv) to obtain a solid phase; (vi) soaking said solid phase of part (v) in ethanol; (vii) stirring the soaked material of step (vi), separating the ethanol-soluble supernatant and evaporating the solvent from the supernatant to obtain a second solid phase; (viii) drying the second solid phase of step (vii) to obtain a dry powder.