Systemic Nematicides for the Control of Trichodorid Nematodes and of Potato Spraing Disease caused by Tobacco Rattle Virus.

Field trials in Scotland in 1972 and 1973 tested the effects of three systemic nematicides (aldicarb, fenamiphos and oxamyl) and the fumigant dichloropropane-dichloropropene mixture (D-D) on the incidence of spraing in potato tubers (cv. Pentland Dell) and on total numbers of trichodorid nematodes, the vectors of tobacco rattle virus. Spraing incidence was least in plots treated with aldicarb or oxamyl. D-D and fenamiphos were effective in decreasing spraing incidence in one year but not in the other. Whereas D-D killed the trichodorid vectors, aldicarb and oxamyl did not kill them but apparently affected their behaviour. None of the chemicals was phytotoxic or decreased tuber yield. [ABSTRACT FROM AUTHOR]