Toxicity impacts of certain insect growth regulators on some biochemical activities of the cotton leafworm.
Abstract: The present work was conducted to study the susceptibility of both laboratory and field strain of 2"° and 41h 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 LCso 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 2"d 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 t',A1 . Moreover data exposed that the LCSO values of both the laboratory and the field strains on 41h instar larvae were remarkably higher compared with 2"d instar larvae and gave the same arrangement between tested compounds . Flufenoxuron showed the highest resistance ratio, followed by Lufenuron reached nn'ITVland 8198.804 fold on the 4th instar larvae , respectively. Chlorfluazuron and Hexaflumuron gave the moderately levels of resistance ratio with degree of fold oYr,9o• 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- & R-esterase), phosphatases (acid and alkaline phosphatase), transaminase (AST and ALT) and carbohydrate hydrolyzing enzymes (amylase and invertase) were evaluated on the field strain of Spodoptera littoralis(Boisd.), compared with the laboratory strain .
Publication year 2005
Pages 915-935
Availability location معهد بحوث وقاية النباتات -- شارع نادى الصيد - الدقى- الجيزة
Availability number
Organization Name
City جيزة
serial title المجلة المصرية للبحوث الزراعية
ISSN 1110-6336
Author(s) from ARC
Agris Categories Protection of plants - General aspects
AGROVOC
TERMS		 Biochemical pathways. Chlorfluazuron. Diflubenzuron. Flufenoxuron. Insect growth regulators. Spodoptera littoralis. Toxicity.
Publication Type Journal
↑