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Effect of entomopathogenic nematodes on egg mass formation by the northern root-knot nematode, Meloidogyne hapla



Effect of entomopathogenic nematodes on egg mass formation by the northern root-knot nematode, Meloidogyne hapla



Korean Journal of Applied Entomology ember; 41(3): 225-231



The entomopathogenic nematodes, Steinernema carpocapsae All strain (ScA), S. glaseri NC strain (SgN) and H. bacteriophora NC 1 strain (HbN), were evaluated for the effects on egg mass formation by the northern root-knot nematode, Meloidogyne hapla in pot experiment using tomato. In the first experiment, 2.5x105 infective juveniles (Ijs) of entomopathogenic nematodes were inoculated to 100 g of the soil infected with ca. 450 Ijs of M. hapla/100 cm3 in 150 ml container. The number of egg mass was significantly decreased to 9.4-36.5 in ScA, to 5.7-24.7 in SgN and to 11.2-16.0 in HbN treatments compared with 62.5 in M. hapla alone. In the second experiment, ScA and S. carpocapsae Pocheon strain (ScP) and SgN and S. glaseri Dongrae strain (SgD) were treated to 350 g of the soil infected with 100, 200 M. hapla larvae/100 cm3 in 450 ml container. The entomopathogenic nematodes were inoculated at the rate of 2,020 Ijs and 1.6x105 Ijs in 350 g soil. The number of egg mass of M. hapla were significantly decreased in the entomopathogenic nematode treatments compared with M. hapla alone although no differences were observed among Steinernema species, strains, or infection concentrations. Treatments of entomopathogenic nematodes 3 days before M. hapla inoculation were more effective on reduction of egg mass formation than those of 3 days after M. hapla treatments. Growth of tomato was not affected by entomopathogenic nematode treatments.

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