Studies in New York and Pennsylvania compared egg mass recruitment and larval survival on corn and other hosts of the European corn borer, Ostrinia nubilalis (H[umlaut]ubner), to assess the potential of these plants to act as a refuge in a resistance management program. Assessments were made on replicated plantings and natural plant stands in the field and under controlled conditions in the laboratory. Scouting of mixed field plantings revealed more egg masses on corn than any other crop or weed species. At least twice as many larvae per plant were recovered from naturally infested corn compared with the next best host plant across both years. Larval recovery from noncorn host plants varied widely. Fewer adults emerged from overwintering weed stubble than from corn stubble, and the parasitoid Macrocentris grandii (Goidanich) was found associated only with corn stubble. Survival on plants infested with corn borer larvae was consistently higher on corn than on other plants. In a laboratory study, the number of corn borer tunnels in corn was double the next best host, ragweed. Noncorn hosts appear unlikely to provide a substantial number of corn borer individuals susceptible to B. thuringiensis (Berliner) in comparison with the number expected from the 20% planting refuge mandated by EPA registration of Bt-corn. Evidence from these studies do not support a recommendation of reduced refuge planting areas in the northeastern United States.
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.