1919.] SUPPOSED CURE FOR FROGHOPPERS. 



11 



immersion they were both actively moving. Two hours afterwards, 

 during which period they had been kept without food in a closed box, 

 one was almost dead and the other sick. 



The test was repeated more thoroughly on November 21, when 

 25 nymphs were kept completely immersed for one minute and then 

 removed and placed on grass roots. 



Two hours afterwards 8 were dead, and 17 alive. Of the 17 

 several were sick, but the majority were active and four had already 

 made fresh coverings of froth. 



I tried to arrange for experiments in the power of killing eggs but, 

 owing to a fear of his preparation being analysed, Mr. Glasgow would 

 not allow me to take away trash containing eggs, which had been 

 immersed in his preparation. 



FIELD EXPERIMENTS 



At Orange Grove. 



On November 6 Mr. Moodie, Mr. Cox and myself were shown fields 

 12, 13, 14 (Fig. I). The canes were second ratoons of B 6450. 



Field 14 had been treated twice with the liquid at the end 

 of August; the eastern half of Field I'd had been treated once 



12 



T 



N 



TRACE 



n 



Fig-. I. 



at the same time ; the remainder of Field 13 and Field 12 had not been 



treated. 



It was said that at the time of treatment, Fields 13 and 14 were 



badly blighted. 



At the time of our visit the damage was slight but noticeable. 

 There was, however, nothing to choose between 14 (treated twice) and 

 the treated pact of 13 (treated once) or between the treated and 

 untreated plots. 



Root disease was occasional on both treated and untreated areas. 



Further enquiry elicited the information that the fields had been 

 limed in July and had received a dressing of sulphate of ammonia in 

 September. Some, at least, of the claimed improvement must be 

 credited to this treatment. 



On November 14 I visited Field 100 (Fig. II) in which one small 

 section at the S.E. corner had received one application of the liquid. 

 The canes were 1st ratoons of B 156. The northern half of the field 

 had been given a dressing of sheep manure uniformly from one end 

 to the other. 



