Oogenesis pattern and type of ovariole of the parasitoid Palmistichus elaeisis (Hymenoptera: Eulophidae)

Abstract

The knowledge on ovigeny in parasitoids is important for basic studies on physiology and applied biological control. The ovigeny pattern and type of ovariole of the parasitoid Palmistichus elaeisis Delvare & LaSalle (Hymenoptera: Eulophidae) were studied in newly-emerged females at seven, 14, 24 and 48 h intervals after their emergence from Tenebrio molitor L. pupae (Coleoptera: Tenebrionidae). Females of P. elaeisis presented ovaries composed by four ovarioles of the meroistic polytrophic type. The yolk accumulation and chorionogenesis in P. elaeisis were concluded 24 h after the female emergence. The 48 h-old females show a high quantity of egg ready for oviposition. These findings can help to improve the mass production of P. elaeisis and the augmentative biological control by using this natural enemy.

An Insight in the Reproductive Biology of Therophilus javanus (Hymenoptera, Braconidae, and Agathidinae), a Potential Biological Control Agent against the Legume Pod Borer (Lepidoptera, Crambidae)

“…However, differently from other braconids, the follicles are not organized in a string within T. javanus ovarioles but rather appear as "free" egg chambers. This kind of organization resembles to some extent what have been described in some Eulophidae parasitoids (e.g., Palmistichus elaeisis (Hymenoptera: Eulophidae)) [22].…”

Foraging Activity ofPalmistichus elaeisis(Hymenoptera: Eulophidae) at Various Densities on Pupae of the Eucalyptus DefoliatorThyrinteina arnobia(Lepidoptera: Geometridae)

“…Thyrinteina arnobia pupae that were 24 to 48 h old were individually exposed to 72-to 96-h-old P. elaeisis females (Andrade et al 2012) in glass tubes (14 cm height × 2.5 cm diameter) and placed in a chamber maintained at 25 ± 2 °C, 70 ± 10% RH, and a 12:12 h L:D photoperiod, at density treatments of 1, 3, 6, 9, 12, 15, 18, and 21 parasitoids per host. After 48 h, the P. elaeisis females were removed from the tubes.…”

Reproductive Potential and Biological Characteristics of the Parasitoid Cotesia flavipes (Hymenoptera: Braconidae) in Diatraea saccharalis (Lepidoptera: Crambidae) Depending on Parasitoid-Host Ratio

“…The inverse relation in the number of parasitoid females produced per C. flavipes female with the total number of offspring confirms the fact that superparasitism may decrease the number of females produced (Soares et al 2009;Andrade et al 2010). The number of females laying eggs determines the sex ratio; as this number increases, the number of fertilized eggs decreases (Andrade et al 2012).…”