Neem Oil for black spots on beans

Neem Oil is a commonly used garden product, organically approved for use on food crops. Type 'Neem' in the forum search here for all sorts of discussions about it.

It is primarily a pesticide but to work it has to come into direct contact with the pest. It also has some limited fungicide benefits as it coats the leaves. It has some negative side effects if over-used so follow the label directions for time and frequency of application as well as dilution.

Whether it will work on your beans or not all depends on what the cause of the problem is. If it is one of the common bean pests you have to spray the pests directly, if one of the common fungus diseases of beans it may slow the disease but won't cure it and to prevent it you have to apply it from the very beginning, if it is Bacterial Spot of Speck Neem won't help.

So your first step is to research the actual cause - lots of pics of 'common bean pest' and 'common bean diseases' available on the web for comparison.

Dave