I have sprayed my Broad Beans with Liquid Derris twice this year , and have not seen one black fly on any parts of the plants .
I will be picking pods within the next two weeks .
If you have ever grown Broad Beans , Black flies usually cover them .
Will let you know how I get on with them .
I will be picking pods within the next two weeks .
If you have ever grown Broad Beans , Black flies usually cover them .
Will let you know how I get on with them .