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Scyphophorus acupunctatus  is the main pest of  Agave tequilana . Its adults are vectors of  Erwinia carotovora , which causes plant destruction. The susceptibility of  S. acupunctatus  larvae to various strains of entomopathogenic nematodes has been demonstrated previously (Molina et al., 2004). In the current paper, the use of seven different concentrations: 0, 10, 20, 50, 100, 200, and 500, of infected juveniles per larva in petri dishes containing a filter paper against  Steinernema carpocapsae  strains All, Ca, and Fl, and also against native insolated N1, N2, N4, belonging to the genera  Steinernema  sp. The studies were conducted under laboratory conditions to determine the susceptibility of  S. acupunctatus  larvae to entomopathogenic nematodes. One hundred percent mortality of  S. acupunctatus  larvae was achieved by  S. carpocapsae  strains All, Ca, and Fl with exposure to 100 infected juveniles. In the case of native isolates, N2 registered 95% mortality, and for N4 and N1, mortality registered was 75%. An analysis of variance was conducted in order to determine whether strain or isolate had the highest virulence against  S. acupunctatus  larvae. Means for  S. acupunctatus  larvae by entomopathogenic nematodes presented significant differences (F = 57.01; df = 55, 223;  P  &lt; 0.0001), resulting in two levels. At the first level,  S. carpocapsae  All, Fl, and Ca are statistically the same as isolate N4. At the second level, the isolates N4 and N1 are statistically the same. The results indicate the high susceptibility of  S. acupunctatus  larvae. The infectivity of native isolates as well as  S. carpocapsae  strains All, Fl, and Ca are associated with the symbiotic bacterium  Xenorharbdus  sp., suggesting they have potential for use against  S. acupunctatus  larvae.

hortscience

(365) Susceptibility of Scyphophorus acupunctatus Gyllenhal (Coleoptera: Curculionidae) Larvae to Entomopathogenic Nematodes Steinernema (Rhabditida: Steinernematidae)