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Title: VARIATION IN VIRULENCE OF HETERORHABDITID NEMATODES AGAINST WHITE GRUBS (COLEOPTERA: SCARABAEIDAE)

Author
item GREWAL, P - THE OHIO STATE UNIVERSITY
item ZHANG, X - THE OHIO STATE UNIVERSITY
item GREWAL, S - THE OHIO STATE UNIVERSITY
item Klein, Michael
item MALIK, V - THE OHIO STATE UNIVERSITY

Submitted to: Society of Nematology Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 6/26/2001
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Virulence of entomopathogenic nematodes, Heterorhabditis bacteriophora HP88 strain, H. bacteriophors GPS11 strain, H. indica, H. marelatus, H. megidis and H. zealandica against four white grub species was evaluated in sand- based bioassays. The nematode species/strains were ranked based on the LD50 (letha dose to cause 50% mortalaity) from lowest (most virulent)to the ehighest against each grub species. Against the Japanese beetle, Popillia japonica, the nematode species ranked as follows: H. zealandica, H. bacteriophora GPS11, H. magidis, H. marelatus, H. bacteriophors HP88, H. indica. Against the northern masked chafer, Cyclocephala borealis, the species ranked as H. zealandica, H. megidis, H. bacteriophora GP11, H. bacteriiophora HP88. Against the oriental beetle, Exomala orientalis, the rankings were: H. bacteriophora GPS11, H. zealandica, H. megidis, H bacteriophora HP88 . The European chafer, Rhizotrogus majalis was least susceptible to entomopathogenic nematodes with H. megidis and H. zealandic producing only 25 and 15% mortality, respectively. The reasons for differences in the virulence of nematode strain to different group species are being explored.