Archives of Phytopathology and Plant Protection (2000) 33, 351-360

E.M. Hegazi, A.Y. El-Shazli, M.B. Hafez and G.M. Abd El-Aziz (2000)
Influence of Precocene II on the estimated changes within the haemocyte population of parasitized Spodoptera littoralis larvae by Microplitis rufiventris
Archives of Phytopathology and Plant Protection 33 (4), 351-360
Abstract: Series of experiments were undertaken to investigate whether application of Precocene II (PII) to parasitized S. littoralis larvae can influence their THCs and DHCs. PII was applied in single dose treatments (70μg/5 μl/dose). Haemolymph samples were taken at daily intervals from day 3 to day 8 post-treatments. Two distinct alterations were noted; first, PII-treatments caused significant decrease in THCs. Once the parasitoid larvae emerge from either treated or untreated hosts, a sharp decline in THCs was observed. The second effect was changes in DHCs of S. littoralis larvae. In controls, haemocyte types could be arranged in descending order due to their relative occurrence into plasmatocytes (PLs), prohaemocytes (PRs), spherule cells (SPs), granular cells (GRs) and oenocytoids (OEs). This order changed in treated hosts to PLs, GRs, PRs, SPs and OEs, i.e., GRs that were less prevalent in the haemolymph of control larvae increased significantly in PII-treated hosts. In the latters, sharp rise in GRs levels followed parasitoid emergence. OEs cells were scarce in both treated and untreated hosts. No significant difference was observed between the overall means of PLs in both types of host larvae. But GRs-PRs was markedly altered in treated larvae.
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Link to article at publishers website
Database assignments for author(s): Esmat M. Hegazi

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Spodoptera littoralis
Microplitis rufiventris (parasitoid)	Spodoptera littoralis