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Your Position :Home->Past Journals Catalog->2014年51 No.6

Biological and ecological characteristics of Chorthippus albonemus Cheng et Tu (Orthoptera: Arcypteridae)
Author of the article:WEI Shu-Hua1** ZHANG Yu2 ZHANG Rong1*** GAO Li-Yuan1HUANG Wen-Guang2 YU Zhao2
Author's Workplace:1. Institute of Plant Protection, Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750002, China;2. Grassland Workstation of Ningxia, Yinchuan 750002, China
Key Words: Chorthippus albonemus, life history, morphological characteristics, host selection, daily forage ingestion, developmental threshold temperature, effective accumulated temperature
Abstract: [Objectives]  In recent years grassland pests have become increasingly diverse, emergent, fulminant pests have increased, and damage to grassland ecology has increased in association with changes of climate and ecological environment. Much basic biological and ecological research on the main pests of grasslands in Ningxia remains to be done. This has restricted the effective development of grassland monitoring and pest prevention and control work. [Methods]  Chorthippus albonemus Cheng et Tu is a major pest of the typical steppe habitat of Ningxia. We studied the life history, feeding and the effect of temperature on the growth of this species through indoor rearing and field investigations combined with covered, feeding experiments. [Results]  Overwintering eggs of C. albonemus have two incubation periods every year in typical Ningxia steppe. The first overwintering eggs begins to hatch from early to mid-April and the first hatching peak occurs from early to mid-May. After that, emergence gradually begins, and adults mate and oviposit from late June to early July. During this period these insects are called “summer locusts”. Second overwintering eggs begin to hatch from early to mid-July and the second hatching peak occurs from early to mid-August. The adults mate and oviposit from early to mid-September and are called “autumn locusts”. Grasshoppers fed on Stipa bungeana but prefered Leymus secalinus, fed relatively little on Potentilla acaulis, Heteropappus altaicus, Lespedeza bicolor and Echinochloa crusgalli, and only on occasionally Artemisia frigid and Artemisia scoparia. Consumption and approximate digestion increased with age. In addition, the consumption and approximate digestion of female adults was higher than that of males. Excessively high or low temperatures were unfavorable to survival. Nymphs could not molt at 13 and adults could not mate at 18. The developmental duration of every stage was reduced with increasing temperatures from 18 to 33. The developmental duration of C.albonemusnymph at18was 3.094.93 times longer than that at33. [Conclusion]  The developmental duration, developmental threshold temperature, effective accumulated temperature and other ecological characteristics of C. albonemus have been determined. In addition, the effect of temperature on growth and development were analyzed. These data could provide the basis for further understanding the occurrence of these pests, and improve monitoring, outbreak prediction, prevention and control.
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