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2738043 
Technical Report 
Effects of nematocides to potato cyst nematode, Globodera rostochiensis 
Takakura, S; Yamada, E; Ueno, K; Kon, T 
1979 
HEEP/81/02756 
0 
42 
67-79 
HEEP COPYRIGHT: BIOL ABS. Several nematocides were tested on heavily infested volcanic ash soil in Makkari Hokkaido, Japan. The spring application of D-D (dichloropropene-dichloropropane) and EDB (ethylene dibromide) controlled nematodes in proportion to the dosage, but the sprout and growth of potato plants were delayed due to phytotoxicity and the yields decreased with increase in dosage. The autumn application (Sept.-Oct.) of 60 l/10a (are) of D-D and 30 l/10a of Di-trapex were effective with no observable phytotoxicity to potato. The density of nematodes was low in those plots where non-host crops were cultivated. The density in potato plots at harvest time was sometimes higher than those of untreated plots. The fumigants should be used in combination wtih non-host crops. Two applications at 1/2 dose were more effective than 1 application at regular doses. The density of nematodes at harvest time in the plots where non-host crops were cultivated was and lt; 10% of the density at planting time. Overall treatment of 30 kg/10a of Vydate (1%), 30-40 kg/10a of Diazinon (5%) and furrow treatment of 15 kg/10a of Vydate at planting time effectively controlled nematodes. The number of viable eggs in the soil after harvest was smaller than that of the untreated plot. The growth and yield of the susceptible potato cultivar Benimaru greatly improved. Among other nematocides tested, overall treatment of 30 kg/10a of PD-576 (organophosphorus) (5%), 20 kg/10a of Mocap (5%), 20 kg/10a of Mocap (5%), 30 kg/10a of PD-223 (organophosphorus) (5%), and 5 kg/10a of Nemacur were also effective. The method and time of application of the fumigants, as well as the dependence of reaction mechanisms on application procedure of the granules are discussed.