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Amer, R., Yacoub, S., Salem, M. (2015). HISTOPATHOLOGICAL EFFECTS OF SOME BIO-AGENT COMPOUNDS EXPOSED TO GAMMA IRRADIATION ON THE COTTON LEAF WORM, Spodoptera littoralis (BOISD.). Journal of Plant Protection and Pathology, 6(10), 1369-1380. doi: 10.21608/jppp.2015.75311
Reda A.M. Amer; Sh. S. Yacoub; M. S.M. Salem. "HISTOPATHOLOGICAL EFFECTS OF SOME BIO-AGENT COMPOUNDS EXPOSED TO GAMMA IRRADIATION ON THE COTTON LEAF WORM, Spodoptera littoralis (BOISD.)". Journal of Plant Protection and Pathology, 6, 10, 2015, 1369-1380. doi: 10.21608/jppp.2015.75311
Amer, R., Yacoub, S., Salem, M. (2015). 'HISTOPATHOLOGICAL EFFECTS OF SOME BIO-AGENT COMPOUNDS EXPOSED TO GAMMA IRRADIATION ON THE COTTON LEAF WORM, Spodoptera littoralis (BOISD.)', Journal of Plant Protection and Pathology, 6(10), pp. 1369-1380. doi: 10.21608/jppp.2015.75311
Amer, R., Yacoub, S., Salem, M. HISTOPATHOLOGICAL EFFECTS OF SOME BIO-AGENT COMPOUNDS EXPOSED TO GAMMA IRRADIATION ON THE COTTON LEAF WORM, Spodoptera littoralis (BOISD.). Journal of Plant Protection and Pathology, 2015; 6(10): 1369-1380. doi: 10.21608/jppp.2015.75311

HISTOPATHOLOGICAL EFFECTS OF SOME BIO-AGENT COMPOUNDS EXPOSED TO GAMMA IRRADIATION ON THE COTTON LEAF WORM, Spodoptera littoralis (BOISD.)

Article 5, Volume 6, Issue 10, October 2015, Page 1369-1380  XML PDF (852.4 K)
Document Type: Original Article
DOI: 10.21608/jppp.2015.75311
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Authors
Reda A.M. Amer email 1; Sh. S. Yacoub2; M. S.M. Salem2
1Plant Protection Research Institute, Agriculture Research Center, Giza, Egypt.
2Plant Protection Research Institute, (A.R.C.) Dokki, Giza, Egypt.
Abstract
Bio-agent compounds of Bacillus thuringiensis, Kurs. (Bactericide); Metarhizium anisopltiae, Metsch. (Fungicide) and biopolymer, chitosan exposed to gamma irradiation doses; 15, 30 and 60 Gy to purpose of potentiate the bio-agent efficiency against the cotton leaf worm, Spodoptera littoralis (Boisd.) treated as 4th instars larvae by LC50 of tested bio-agent compounds singly or combined with gamma irradiation doses to investigate the histopathological changes in the integument, muscle, fat body and mid gut.
Most of treatments especially gamma doses of 60 Gy singly or combined with bio-agent compounds caused thickening of outer cuticle fibrous layer in the integument of S. littoralis larvae. Also, hypodermis layer had swelling and necrosis in gamma treatments and M. anisopltiae or chitosan combined with 30 Gy treatments.
Also, most of treatments caused appearance of fissure and breaking down of muscles into small parts.
All the bio-agent treatments caused a noticeable destruction on the fat body cells as vacuolization of the fat cells and destruction of the fat body membranous sheath.
Many deleterious effects in the mid gut of S. littoralis as destruction of columnar or hyperphesia cells lining mid gut, losses of brush border with increase of goblet cells.

Dose of 60 Gy is considered the best dose used in the current study to potentiate the bio-agent effects on S. littoralis larvae compared with other gamma irradiation doses used.
 
Keywords
Spodoptera littoralis; Histopathological; integument; muscle; fat body; mid gut; Bacillus thuringiensis; Metarhizium anisopltae; Chitosan
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