Aggregation and the transformation of counts of Aphis fabae Scop, on beans

In several sets of counts of Aphis fabae colonies on bean stems, obtained with different sampling methods, variance was always proportional to the same power of the mean; s2=amb where b= 1.72 and a differed by different sampling methods. The resulting standard transformation for A. fabae on beans, z=x0 2, is marginally more effective than z= log (x+1). RESP-6186