E. M. Doidge 



9 



the previous table is due to the fact that the first gives the rainfall in 

 the whole district, the second in Barberton only. 



Season 1911—12. 



grown all trees 



diseased 

 40-70 % 

 affected 



Diseased spots were first observed on the fruit about three weeks 

 after the first rain of the season. 



The final estimate of the percentage of diseased fruit refers only to 

 the mangoes still on the trees ; large numbers had fallen to the ground 

 and rotted. 



The result of the experiment was far from encouraging. On the 

 20th January an estimate of the number of mangoes still on the trees 

 showed 30-7 % free from disease on the trees sprayed with iron sulphide 



