CULT: Leaf Spot-Boron Deficiency?
Reading in IRIS: AN IDEAL HARDY PERENNIAL, published by the AIS in 1947, I
came upon the suggestion (p. 88) that leafspot may be related to a Boron
deficiency in the soil.
The book distinguishes between fungal and bacterial spot, and the implication
is that the fungal variety is the one they are talking about here. This comes
in the section dealing with collective responses to a series of questions
posed to "eighty five iris experts" across the US. Their chief response to
how to treat for leaf spot was "cut off diseased portions and burn".
I don't know anything about Boron, but if anyone else can dilate on this idea
I would like to hear it, boring or not.
Anner Whitehead, Richmond, Va
Henry Hall email@example.com