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Toxicity impacts of certain insect growth regulators on some biochemical activities of the cottonleafworm
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Abstract: The present work was conducted to study the susceptibility of both laboratory and field strain of 2nd and 4th instars larvae of the cotton leafworm Spodoptera littoralis (Boisd) to six insect growth regulators (Diflubenzuron, Tebufenozide, Hexaflumuron, Flufenoxuron, Chlorfluazuron and Lufenuron). The obtained data revealed that based on resistance ratio, the fold of resistance varied considerably according to the chemical structure of the studied IGRs and the instar of larvae. The high differences in LC50 values were observed between the laboratory and the field strains as demonstrated by resistance ratio of 162850, 17680 and 2145 fold. For flufenoxuron, lufenuron and chlorfluazuron relating to 2nd instar larvae, respectively. Resistance ratio was recorded 217.60 and 20.40 for Hexaflumuron and Diflubenzuron, respectively. Tebufenozide gave low resistance ratio with degree of fold 2.81. Moreover data exposed that the LC50 values of both the laboratory and the field strains on 4th instar larvae were remarkably higher compared with 2nd instar larvae and gave the same arrangement between tested compounds. Flufenoxuron showed the highest resistance ratio followed by lufenuron reached 886371 and 8198.804 fold on the 4th instar larvae, respectively. Chlorfluazuron and Hexaflumuron gave the moderately levels of resistance ratio with degree of fold 533.950 and 181.131 in addition there were low level of resistance ratio to diflubenzuron and tebufenozide with degree of fold 17.51 and 5.390, respectively. In addition the effect of tested IGRs on the activity of esterases (aliphatic esterase and a-&β-esterase), phosphatases (acid and alkaline phosphatase), transaminase (AST and ALT) and carbohydrate hydrolyzing enzymes (amylase and invertase) were evaluated on the field srain of spodoptera littoralis (Boisd), compared with the laboratory strain.
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| Publication year |
2005
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| Pages |
915-935
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| Availability location |
معهد بحوث وقاية النباتات-ش نادي الصيد -الدقي
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| Availability number |
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| Organization Name |
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| City |
الدقهلية
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| serial title |
Egypt.J. Agric Res
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| ISSN |
1110-6336
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| Department |
Cotton Leaf worm
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| Author(s) from ARC |
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| Agris Categories |
Pests of plants
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AGROVOC
TERMS |
Growth.
Insecta.
Spodoptera.
Toxicity.
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| Publication Type |
Journal
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