EVALUATION THE EFFICACY OF TWO INSECT GROWTH REGULATORS (IGRS) AGAINST EGYPTIAN COTTON LEAFWORM, Spodoptera littoraiis AND THEIR LATENT EFFECT ON THE PUPATION AND THE DAILY RATE OF CONSUMED FOOD.
Eldoksh,, R., Aref, S., EI-Naggar, J., Hegazy, W. (2006). EVALUATION THE EFFICACY OF TWO INSECT GROWTH REGULATORS (IGRS) AGAINST EGYPTIAN COTTON LEAFWORM, Spodoptera littoraiis AND THEIR LATENT EFFECT ON THE PUPATION AND THE DAILY RATE OF CONSUMED FOOD.. EKB Journal Management System, 31(6), 3947-3955. doi: 10.21608/jppp.2006.235228
Roud A. A. Eldoksh,; S. A. Aref; Jehan B. EI-Naggar; Wafaa H. Hegazy. "EVALUATION THE EFFICACY OF TWO INSECT GROWTH REGULATORS (IGRS) AGAINST EGYPTIAN COTTON LEAFWORM, Spodoptera littoraiis AND THEIR LATENT EFFECT ON THE PUPATION AND THE DAILY RATE OF CONSUMED FOOD.". EKB Journal Management System, 31, 6, 2006, 3947-3955. doi: 10.21608/jppp.2006.235228
Eldoksh,, R., Aref, S., EI-Naggar, J., Hegazy, W. (2006). 'EVALUATION THE EFFICACY OF TWO INSECT GROWTH REGULATORS (IGRS) AGAINST EGYPTIAN COTTON LEAFWORM, Spodoptera littoraiis AND THEIR LATENT EFFECT ON THE PUPATION AND THE DAILY RATE OF CONSUMED FOOD.', EKB Journal Management System, 31(6), pp. 3947-3955. doi: 10.21608/jppp.2006.235228
Eldoksh,, R., Aref, S., EI-Naggar, J., Hegazy, W. EVALUATION THE EFFICACY OF TWO INSECT GROWTH REGULATORS (IGRS) AGAINST EGYPTIAN COTTON LEAFWORM, Spodoptera littoraiis AND THEIR LATENT EFFECT ON THE PUPATION AND THE DAILY RATE OF CONSUMED FOOD.. EKB Journal Management System, 2006; 31(6): 3947-3955. doi: 10.21608/jppp.2006.235228

EVALUATION THE EFFICACY OF TWO INSECT GROWTH REGULATORS (IGRS) AGAINST EGYPTIAN COTTON LEAFWORM, Spodoptera littoraiis AND THEIR LATENT EFFECT ON THE PUPATION AND THE DAILY RATE OF CONSUMED FOOD.

Journal of Plant Protection and Pathology
Article 4, Volume 31, Issue 6, May and June 2006, Page 3947-3955  XML PDF (2.36 MB)
Document Type: Original Article
DOI: 10.21608/jppp.2006.235228
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Authors
Roud A. A. Eldoksh,; S. A. Aref; Jehan B. EI-Naggar; Wafaa H. Hegazy
Plant Protect. Res. Inst. A. R. C., Giza, Egypt.
Abstract
Two insect growth regulators (IGRs), diflubenzuron and lufenuron were
tested against cotton leafworm Spodoptera littoralis at Sakha Lab-field by feeding the
2nd, and 4th instar larvae on treated cotton leaves for 48 hrs and untreated leaves till
pupation for four indicated intervals (zero, 7, 14, 21 days treatment). Also, the
effecting of these compounds on the daily rate of consumed food by the, 4th, s", and
6th instar larvae was recorded.
The results showed the following:

The tested compounds were highly effective at O-time interval (initial kill after 5 days
post-treatment) recording 95 and 99 % mortality with ciflubenzuron and lufenuron
respectively on the 2nd instar larvae, while the percent mortality were 91 and 97 on
the 4th instar larvae.
The tested compounds could be arranged according their residual effect (7 - 21
days post treatment~ in descending order as follows, diflubenzuron (78 %) and (79.3
%) on the 2nd and 4t instar larvae respectively and lufenuron (97.6 %) and (87.6 %)
on the 2nd and the 4th instar larvae.
Diflubenzuron induced zero % pupation on the 2nd instar larvae and 11.1 % on the
4th instar larvae, while lufenuron induced zero % pupation with the two instar larvae
comparing with control, where the percent pupation were 91.7 % and 89.5 % with
the 2nd and the 4th instar larvae.
Lufenuron was the highest effective toxicant, where it prevented the larvae to reach
pupal stage for 7 and 14 days post treatment.

Significant differences were recorded between control and other treatments in the
daily rate of consumed food treated with diflubenzuron and lufenuron by the 4th, 5th,
and 6th instar larvae.
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