Resistant Mechanisms Of The Fild Cotton Leafworm Spodoptera littoralis ( Boisd) To Insect Growth Regulators During 2012 to 2014 Cotton Seasons

Abstract: Field strains of the cotton leaf worm Spodoptera littoralis (Boisd) were collected from three Governorates (Gharbya, Kafr El- Sheikh and Behera) during 2012 to 2014 cotton seasons for monitoring of its resistance to Agron (Flufenoxuron) 10% DC, Topron (Chlorfluazuron) 5 yo EC, Dimeuron (Hexaflumuron) 10 % EC and Cascade (Flufenoxuron) 10 %DC.
The IGR Agron had low and medium levels of resistance in Gharbya for resistance coeff,rcient (RC) 1.72,2.62 and 3.39. The same results were obtained in Kafr El-Sheikh and Behera strains during 2012 for RC (0.42 and 1.47), While it reached to medium level of resistance (2.76, 3.92) and (3.2, 4.03) during 2013 and 2014 cotton seasons for Kafr El - Sheik and Behera strains respectively.
Topron recorded lack and low levels ofresistance at the cotton season 2012 in Gharbya , Kafr El-Sheikh and Behera with RC ( 1.01 , 0.54 and 0.45 ) respectively , while this compound had medium level of resistancein2014 cotton season (3.26,3.37 autd4.12 ) to the same Governorate .
During the cotton season 2012, Dimeuron and Cascade showed medium levels of resistance (RC) in all tested field strains except Cascade in Gharbya had low level of resistance. RC to Dimeuron reached to high level of resistance in Gharbya and Kafr El- Sheikh with RC (5.62 and 7.02) in 2014 cotton season 'Also, Cascade had high level of resistance in the three field strains with RC (5.47 , 5 -12 and 5.76) to Gharbya , Kafr El-Sheikh and Behera strains in 2014 cotton season.
The IGRs Agron and Topron gave good results against the three tested field strains of the cotton leaf worm, the resistance levels (RR) had not reached than 4.61 fold to Agron and 4.59 fold for Topron in the cotton season 2014.
Publication year 2015
Organization Name
Country Egypt
Publisher Name: مجلة الكيمياء البيولوجية والعلوم البيئية (كلية الزراعة - جامعة عين شمس)
Place: (كلية الزراعة - جامعة عين شمس)
serial title مجلة الكيمياء البيولوجية والعلوم البيئية (كلية الزراعة - جامعة عين شمس)
Author(s) from ARC
Publication Type Journal
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