SUMMARY
In glasshouse soils infested with grey sterile fungus, the cause of brown root rot of tomato, and the potato cyst nematode, methyl bromide fumigation increased yield, and controlled the nematode at all except the lowest treatment applied. In the experiments described here methyl bromide did not affect the development of brown root rot.
SUMMARYSugarcane yields and smut incidence levels were observed in three successive crops. The effect of pathogen upon host was primarily one of stress, as smut infection was shown to increase sucrose content of cane whilst depressing yields in tonnes of cane per ha. Where infection levels were high, roguing was shown to increase disease incidence. However, smut whip removal was confirmed as the best roguing treatment for commercial fields. Disease control and yield responses related to roguing effort were much better in NCo 376 than NCo 310; and, therefore, continued cultivation of NCo 310 fields with high smut incidence was concluded to be a major hazard to the industry.
I n a study of the association between the causal fungus of brown root rot of tomatoes and Heterodera rostochiensis Woll., it was demonstrated that the nematode did not increase the susceptibility of the roots to invasion by the fungus; however, the fungus decreased the hatch of the potato root eleworm, the invasion of the host plant by the nematode, and number of new cysts subsequently produced.
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