Developmental Time of <I>Melanoplus sanguinipes</I> (Orthoptera: Acrididae) at High Latitudes

Seasonal Occurrence of Different Grasshoppers Species (Orthoptera: Acridoidea) in Uruguay

“…Concerning S. lemniscata, Turk (2002), in Tucumán (Argentina), found that eggs could have obligatory diapause or lack it COPR (1982), Sánchez (1983), Cigliano and Ronderos (1994), and Lange et al (2005) considered that this species has obligatory diapause. This species also has wide geographical distribution, which explains the possible intraspecific differences in voltinism (univoltine, bivoltine or multivoltine) depending on the region considered, as it has been observed in other species of Melanoplinae (Fielding, 2004, Mariottini, 2009). …”

“…The embryonic diapause may be obligatory or facultative; the latter allows the insects to have more than one generation per year when conditions are favorable (Tauber et al, 1986). Most of the grasshopper species that inhabit temperate grasslands are univoltine and have extended periods of obligatory embryonic diapause (Joern & Gaines, 1990, Fisher et al, 1996, Fielding, 2004, Mariottini et al, 2011.…”

Effects of Soil Depths on Nymphal Eclosion of Melanoplus sanguinipes (Fabricius)

“…Fielding [7][8][9][10] reported developmental adaptation between the two colonies. The differences in developmental parameters reported by Fielding [7][8][9][10] were associated with post-eclosion biological activities and were not detected in our study; therefore, we averaged nymphal developmental parameters over colony origin.…”

“…Considerable research has been conducted on grasshopper biology, ecology, competition, food quality, predators, pathogens, and population regulation of Alaska grasshoppers [6][7][8][9][10][11][12] but little work has been conducted on cultural practices (tillage, plowing) to manage grasshoppers in Interior Alaska. There is a lack of understanding of how cultural practices can affect egg mortality and nymphal emergence.…”

“…Dag Hammarskjöld 3241, Vitacura, Santiago, Chile, Room 319, USA; Tel: 56-2-923-2295; Fax: 56-2-923-2101; E-mail: alberto.pantoja@fao.org Alaska since it is expected that insect, diseases, and weed populations will increase with climate change [14]. Additionally, adaptation to northern environments has been demonstrated for high-latitude populations of grasshoppers [6][7][8][9][10][11][12]. The ability to control grasshoppers with cultural practices and the development of integrated pest management (IPM) tactics will be a major step toward controlling grasshoppers in Alaska.…”