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Comparative toxicity of two ecdysteroid agonists, RH-2485 and RH-5992, on susceptible and pyrethroid-resistant strains of the Egyptian cotton leafworm, Spodoptera littoralis
Year:
1995
Source of publication :
Phytoparasitica
Authors :
Horowitz, Rami
;
.
Ishaaya, Isaac
;
.
Yablonski, Sara
;
.
Volume :
23
Co-Authors:

Ishaaya, I.
Yablonski, S.
Horowitz, A.R., Dept. of Entomology, ARO, Volcani Center, Bet Dagan, 50250, Israel

Facilitators :
From page:
139
To page:
145
(
Total pages:
7
)
Abstract:
The comparative toxicity of two non-steroidal ecdysteroid agonists, RH-2485 and RH-5992 (tebufenozide), on development stages, fecundity and egg viability of a susceptible laboratory strain and a pyrethroid-resistant field strain of Spodoptera littoralis (Boisduval) was evaluated. Taking the LC50s as the criterion, RH-2485 was 3–7-fold more potent than RH-5992 against the susceptible and 7–14-fold more against the field strain. The LC50 of RH-2485 in the 1st and 6th instars of the susceptible strain was 0.32 and 0.57 mg a.i./l, respectively. The field strain showed a mild cross-resistance of about threefold to both compounds in 1st instars and to a lesser extent in 6th instars. A considerable increase in fecundity (~3-fold) and no effect on egg viability was observed when 6th instars were fed on cotton leaves treated with 0.25 mg a.i./l RH-2485 (~LC40). Our results indicate that both compounds are potentially potent insecticides for controlling S. littoralis larvae, being 10-60-fold more potent than a previous ecdysteroid agonist, RH-5849. © 1995, Springer Science + Business Media B.V.. All rights reserved.
Note:
Related Files :
Cross-resistance
Ecdysteroid agonists
Fecundity
Insecticidal activity
RH-2485
RH-5992
Spodoptera littoralis
Tebufenozide
Show More
Related Content
More details
DOI :
10.1007/BF02980973
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
29056
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:44
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Scientific Publication
Comparative toxicity of two ecdysteroid agonists, RH-2485 and RH-5992, on susceptible and pyrethroid-resistant strains of the Egyptian cotton leafworm, Spodoptera littoralis
23

Ishaaya, I.
Yablonski, S.
Horowitz, A.R., Dept. of Entomology, ARO, Volcani Center, Bet Dagan, 50250, Israel

Comparative toxicity of two ecdysteroid agonists, RH-2485 and RH-5992, on susceptible and pyrethroid-resistant strains of the Egyptian cotton leafworm, Spodoptera littoralis
The comparative toxicity of two non-steroidal ecdysteroid agonists, RH-2485 and RH-5992 (tebufenozide), on development stages, fecundity and egg viability of a susceptible laboratory strain and a pyrethroid-resistant field strain of Spodoptera littoralis (Boisduval) was evaluated. Taking the LC50s as the criterion, RH-2485 was 3–7-fold more potent than RH-5992 against the susceptible and 7–14-fold more against the field strain. The LC50 of RH-2485 in the 1st and 6th instars of the susceptible strain was 0.32 and 0.57 mg a.i./l, respectively. The field strain showed a mild cross-resistance of about threefold to both compounds in 1st instars and to a lesser extent in 6th instars. A considerable increase in fecundity (~3-fold) and no effect on egg viability was observed when 6th instars were fed on cotton leaves treated with 0.25 mg a.i./l RH-2485 (~LC40). Our results indicate that both compounds are potentially potent insecticides for controlling S. littoralis larvae, being 10-60-fold more potent than a previous ecdysteroid agonist, RH-5849. © 1995, Springer Science + Business Media B.V.. All rights reserved.
Scientific Publication
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