226 Infestation of Fungus Cultures hy Mites 



100 



E5 80 



280 



Minutes 



X X Aniline (examined immediately). 



• • Pyridine (examined immediately). 



O O Pyridine (examined after 12 hrs.). 



A A Ammonia (examined after 1-2 hrs.). 



Fig. 1 a. Toxicity of vapours of Ammonia, Pyridine and Aniline to mites. 



100 



120 



Seconds 



O O Immediate inspection. x x Inspection after 1-2 hrs. 



Fig. 1 h. Toxicity of Ammonia vapour to mites. 



