Detection of a related difference in efficacy of azadirachtin treatments for the control of whiteflies on <i>Gerbera jamesonii</i> by testing for interactions in generalised linear models

Abstract

Simultaneous confidence intervals for linear combinations of parameters of generalised linear models provide a useful way to compare the efficiency of two plant protection products. The results for the azadirachtin experiment indicate that large differences between any application effects of either Neem Azal U or Neem Pellet cannot be expected.