| Autor: |
Ishaaya, I., Yablonski, Sara, Horowitz, A. R. |
| Zdroj: |
Phytoparasitica; June 1995, Vol. 23 Issue: 2 p139-145, 7p |
| Abstrakt: |
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 ofSpodoptera 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 LC50of 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./lRH-2485 (~LC40). Our results indicate that both compounds are potentially potent insecticides for controllingS. littoralislarvae, being 10-60-fold more potent than a previous ecdysteroid agonist, RH-5849. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
Full text from SpringerLink