The susceptibility of adult sunn pest, Eurygaster integriceps Puton (Hemiptera: Scutelleridae), to five local Syrian isolates of Heterorhabditis bacteriophora, Steinernema riobravae Texas, S. carpocapsae C3B, and H. bacteriophora 8-14 strains was evaluated under laboratory conditions. Concentrations of 50, 100, 200, and 400 nematodes per adult were bioassayed; for each nematode concentration, four groups of five sunn pests in Petri dishes were used and mortality was recorded daily for five d. The mortality induced by nematodes increased, typically with increasing numbers of nematodes per adult and ranged from 30 to 90%. Overall, Heterorhabditis bacteriophora Musherphe strain produced the lowest mortality and Steinernema riobravae Texas strain produced the highest mortality. The LC50 values of H. bacteriophora Musherphe, S. carpocapsae C3B, and S. riobrave Texas were 107.1, 66.6, and 65.3 nematodes per adult sunn pest, respectively. LT50 values ranged from 3.6 to 7.2 d for H. bacteriophora Tabeh-gazira and H. bacteriophora Musherphe strains at 50 nematodes per sunn pest, from 2.9 to 5.1 d for H. bacteriophora Tabeh-gazira and H. bacteriophora Ariha strains at 100 nematodes per sunn pest, from 2.2 to 4.3 d for S. carpocapsae C3B and H. bacteriophora Ariha strains at 200 nematodes per sunn pest, and from 2.0 to 4.3 d for S. riobrave Texas and H. bacteriophora Musherphe strains at 400 nematodes per sunn pest, respectively. Our results suggest that H. bacteriophora Tabeh-gazira, H. bacteriophora El Ratla-1, H. bacteriophora El Ratla-2, H. bacteriophora 8-14, S. carpocapsae C3B, and S. riobrave Texas strains have potential as biocontrol agents against the sunn pest.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 24 • No. 1