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Occurrence of a new pest Casama innotata (Walker, 1855) (Lepidoptera, Erebidae) on a nonnative host plant in an arid environment
Journal of Arid Environments ( IF 2.7 ) Pub Date : 2021-02-04 , DOI: 10.1016/j.jaridenv.2021.104450
Olfa Ezzine , Samir Dhahri , Sonia Hammami , Asma Bourougaaoui , Mohamed Habib Ben Jamâa

At the end of December 2009, larvae of Casama innotata were observed on Vachellia horrida trees on which it caused a considerable defoliation. In November 2015, a new outbreak was detected. Egg batches and pupae were observed on V. horrida and the native species Hammada scoparia. This work contributes at studying some biological aspects of this insect, on two host species V. horrida and H. scoparia in southeastern Tunisia. Egg batches were collected, surveyed daily to follow up the emergence of parasitoids until identification. Neonate larvae were reared on V. horrida and obtained pupae were weighed and conserved until adult flight to establish the sex ratio. Field observations showed larvae on V. horrida and pupae on the two host species. Female of C. innotata lays eggs singly or in small groups. Realized fecundity varied between 19 and 240 eggs. Eggs mortality (parasitized, dried and unfertilized eggs) was higher on H. scoparia than on V. horrida. Two eggs parasitoids were identified: Ooencyrtus sp. and Telenomus sp.. It seems that mortality has an important role on population dynamics of C. innotata, mainly through parasitoids action that maintain the equilibrium between insects and its host.



中文翻译:

在干旱环境中的非本地寄主植物上出现了一种新的有害生物Casama innotata(Walker,1855)(鳞翅目,Erebidae)

2009年12月底,在Vachellia horrida树木上观察到了Casama innotata的幼虫,在该幼虫上引起了相当大的落叶。2015年11月,发现了新的疫情。在V. horrida和本地物种Hammada scoparia上观察到了成批的卵和p。这项工作有助于研究这种昆虫在突尼斯东南部的两个寄主物种V. horridaH. scoparia的某些生物学方面。收集鸡蛋批次,每天调查一次,以追踪寄生虫的出现,直到鉴定出来。在V. horrida上饲养了新生幼虫称重并保存获得的p直至成年飞行,以建立性别比。野外观察显示,在两个寄主物种上,V。horrida和p有幼虫C. innotata的雌性单独或成群产卵。已实现的繁殖力介于19到240个卵之间。H. scoparia的卵死亡率(被寄生,干燥和未受精的卵)比V. horrida高。鉴定出两个卵寄生虫:Ooencyrtus sp.。和Telenomus sp ..似乎死亡率在C. innotata种群动态中具有重要作用,主要是通过维持昆虫及其宿主之间平衡的寄生虫作用。

更新日期:2021-02-04
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