Winter Cover Crop Suppression Practices and Natural Enemies of Armyworm (Lepidoptera: Noctuidae) in No-Till Corn

Reverting Conservation Reserve Program Lands to Wheat and Livestock Production: Effects on Ground Beetle (Coleoptera: Carabidae) Assemblages

“…In this study, 9 species (12.3%) of the 73 species captured accounted for 61.7% of all ground beetles captured. Other studies also have found that a few species dominate the ground beetle fauna in agroecosystems (Kirk 1971, Barney and Pass 1986, Laub and Luna 1992, Tonhasca 1993, Carcamo 1995. The number of ground beetles captured in 1995 more than doubled the number captured in 1996.…”

“…The effects of conventional and conservation tillage practices on species diversity and relative abundances of ground beetle species have been studied widely (Tyler and Ellis 1979, Dritschilo and Wanner 1980, Barney and Pass 1986, Weiss et al 1990, Laub and Luna 1992, Tonhasca 1993, Carcamo 1995. Although ground beetle diversity sometimes increases with decreased tillage (Stinner and House 1990), other indications are that diversity and abundance are not changed (Barney and Pass 1986).…”

Incidence of Mythimna sequax parasitized in wheat crop

“…(GASSEN, 1986) that are able to regulate the pest's seasonal abundance (LAUB & LUNA, 1992). Development of successful biological control programs requires the knowledge of potential natural enemies that regulate pest populations.…”

“…For example, the species L. archippivora has often been recorded in the fall armyworm S. frugiperda (DEQUECH et al, 2004;DELFÍN-GONZÁLEZ, 2007). On the other hand, the species L. aletiae has a limited distribution, although it has been recorded parasitizing Mythimna unipuncta (Haworth, 1809) in the United States (LAUB & LUNA, 1992). In Brazil, BORTOLOTTO et al (2014) recently observed both parasitoids in maize fields parasitizing S. frugiperda.…”

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

“…Armyworms feed on corn plants by stripping the leaves to the midrib, thus removing much of the photosynthetic material. Damage to crops by P. unipuncta is typically non-economic, because populations are generally controlled naturally by Dipteran and Hymenopteran parasitoids (Laub and Luna 1992). However, infrequent, widespread outbreaks can result in significant damage.…”