Population dynamics of Anarsia lineatella in relation to crop damage and the development of economic injury levels

Developing a relationship between pest abundance and damage to crops is essential for the calculation of economic injury levels (EILs) and to anticipate informed management decisions. Field studies were conducted for three successive years (2005, 2006 and 2007) in peach orchards of northern Greece to examine relationships between densities of Anarsia lineatella Zeller (Lepidoptera: Gelechiidae) populations and peach (Prunus persica) yields. According to a linear regression model, the increase in moth’s densities during the 1st flight resulted in a significant reduction in yield (y = 0.436x + 10.22, R² = 0.635, d.f. = 2,11, P < 0.05). Correlation of male moths captured during the 2nd flight and observed yield loss was significant (y = 0.5231x + 17.204, R² = 0.792, d.f. = 2,11, P < 0.05). Moreover, according to a linear model by counting the number of shoot strikes, during the first observation period, a forthcoming yield loss can be estimated (y = 27.389x?6.304, R² = 0.711, d.f. 2,11, F = 22.09, P < 0.05). A significant relationship was observed between the numbers of the 2nd generation larvae and yield loss (y = 163x, R² = 0.890). Regression coefficient of the above function represents yield loss per pest and was applied in the calculation of EIL’s and fixed Economic thresholds (ET’s). In addition, parameter of the price commodity was estimated for 2009 by applying stochastic autoregressive moving average model. By integrating above information, EIL and fixed ET estimated as 112 larvae and 84 larvae per sampling unit for a mean value (€4/0.1 ha) of cost management tactics and a 90% efficacy.     

危害柠条的麦蛾一新种记述(鳞翅目:麦蛾科)

本文记载了希奇;宁条的麦蛾一新种,即锦鸡儿条麦蛾Ａｎａｒｓｉａ ｃａｒａｇａｎａ Ｙａｎｇ ｅｔ Ｌｉ,ｓｐ．ｎｏｖ．。该种与Ａｎａｒｓｉａ ｓｉｂｉｒｅｃａ Ｐａｒｋ ｅｔ Ｐｏｎｏｍａｒｅｎｋｏ外部特征相似,但雄性外生殖器左抱器腹有一个出血内面的细长突起,盐池县,以幼虫叶丝缀叶危害柠条。一年发生两代,第１代发生在６、７月份,株被害率在４０％～６０％,第２代出现在８、９月份,以蛹越冬。文中提供了     

国槐新害虫——竖鳞条麦蛾的初步研究

竖鳞条麦蛾AnarsiasquamerectaLietZheng是国槐上新发现的害虫 ,该文首次报道了其寄主及生物学特性。该虫在山东商河 1年发生 1代 ,以 3龄幼虫在枝条芽缝内越冬 ,用 40 %久效磷 1 0 0 0倍液喷雾防治 ,防治效果较好