|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 82 van 112 gevonden artikelen
| Titel: |
Neemazal Effects on the Consumption and Utilization of Food in Some Early Larval Instars of the Cotton Leafworm, Spodoptera littoralis Boisd. (Noctuidae:Lepidoptera) |
| Auteur: |
H.A. Mohamed K.S. Ghoneim A.S. Bream |
| Verschenen in: |
Pakistan journal of biological sciences |
| Paginering: | Jaargang 6 (2003) nr. 13 pagina's 1118-1124 |
| Jaar: |
2003 |
| Inhoud: |
The azadirachtin preparation, Neemazal, was assessed against the Egyptian cotton leafworm, Spodoptera littoralis to clarify its possible action on the food metabolism. Six concentration levels were prepared: 1250, 625, 312,100,50 and 10 ppm and given to 2nd instar larvae with the food (castor leaves). All metabolic parameters were estimated during the 2nd and 4th larval instars. A detrimental effect on the food intake and consumption of 2nd instar larvae was found, irrespective of the Neemazal conc. level. All estimated metabolic parameters were less than those of control larvae and decreased as the conc. level was increased. Similarly, food intake and faeces output of 4th instar larvae had been undergone to a strong action of Neemazal. The Approximate digestibility (AD) values of 2nd instar larvae increased, but in no certain trend. Its changes ranged from + 0.7 5 (at 1250 ppm) to +5.2% (at 50 ppm). Its values decreased during the 4th larval instar only at the two middle conc. levels but increased at other ones. A dramatic impact of Neemazal on Efficiency of conversion of ingested food to the body substance (ECI) and Efficiency of conversion of digested food to the body substance (ECD) was observed for both 2nd and 4th instar larvae at some conc. levels. Neemazal exerted an inhibitory action on Assimilation rate (AR) of 2nd instar larvae which decreased by increasing conc. The metabolic effect of Neemazal reflected on Relative weight gain (RWG) and Growth rate (GR) which had been drastically reduced. On the other hand, Neemazal exhibited a different effect on AR, Relative metabolic rate (RMR), RWG and GR of 4th instar larvae. It promoted these larvae to attain higher AR, especially at the higher four conc. levels. However, AR or RMR of 4th instar larvae had not been considerably influenced as RWG and GR by Neemazal. |
| Uitgever: |
Asian Network for Scientific Information (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 82 van 112 gevonden artikelen
| << vorige | volgende >> |