Spigelia longiflora (Mart. et. Gal.): actividad antialimentaria en tres especies de insectos fitófagos

Insecto feeding activity of a fraction obtained from the leaves of Spigelia longiflora (Loganiaceae) was tested on the larvae of Pseudaletia unipuncta, Spodoptera frugiperda (Lepidoptera) and Epilachna varivestis (Coleoptera). All the three insect species refused to eat diets treated with the obtained fraction

Effectiveness of three Bt corn events against feeding damage by the true armyworm (Pseudaletia unipuncta Haworth)

A 3-yr study (2002-2004) was conducted to evaluate the resistance of three Bt corn events to herbivory damage by the armyworm, Pseudaletia unipuncta (Haworth). Resistance was assessed by damage ratings and fresh mass measurements. Greenhouse studies were run in 2002 and 2004, and a field study was conducted in 2003. Hybrids expressing the Cry1A(b) insecticidal protein, Mon810 and Bt176 events, and their near isolines, as well as the TC1507 event, which expresses the Cry1F protein, were evaluated. Bt hybrids suffered less damage in all 3 yr and had higher fresh masses in 2002 and 2003 than the non-transgenic isolines. In 2002 and 2003, hybrids expressing the Cry1A(b) protein were significantly less damaged than the hybrid expressing Cry1F. In both 2002 and 2004, the Mon810 event suffered less damage than the Bt176 event, despite expressing the same Cry1A(b) protein. Bt corn, especially the Mon810 event may be used as an effective method of preventing P. unipuncta herbivory damage in corn. Key words: True armyworm, Pseudaletia unipuncta, Bt corn, Cry1A(b), Cry1F, epistasis

Armyworm, Pseudaletia unipuncta (Haworth) (Insecta: Lepidoptera: Noctuidae)

EENY-394, a 5-page illustrated fact sheet by John L. Capinera, describes this "true armyworm", a light reddish brown nocturnal moth bundant in North America east of the Rocky Mountains, whose larvae are notorious for appearing out of nowhere to inflict a high level of defoliation in grain crops. Includes selected references. Published by the UF Department of Entomology and Nematology, October 2006. EENY-394/IN702: Armyworm, Mythimna unipuncta (Haworth) (Insecta: Lepidoptera: Noctuidae) (ufl.edu)