Second instar larvae of Spodoptera. littoralis were fed on caster bean leaves treated with different concentrations of Dipel (Bacillus thuringiensis var. kurstaki). after 72 hours of treatment (estimated LC50) Regarding the LT50 values a negative relationship could be detected between the applied concentration of Dipel and LT50 value; i.e. the LT50 was shortened with the increase in Dipel concentration. The LT50 values being 14.17, 8.81,5.99 and 2.40 days for the used concentrations of 8, 12, 16 and 20 × 10 4 I.U. The second instar S. littoralis larvae were fed on fresh caster bean leaves treated with different concentrations of Dipel + 05 % Amino. , the corrected mortality percentages after 3 days increased by increasing concentration ranged from 40.00 to 90.00 % at the concentrations of 8 to 28 × 10 4
An experiment was conducted at Qaha Research Station, Qalubia governorate, during 2013 cotton season, to study the effects of four foliar fertilizers on biological aspects of cotton leaf worm, Spodoptera littoralis (Boisd.), for three successive generations. (Canada magic, Canada sal, Canada foliar and Canada amino) were sprayed on cotton leaves in field and introduced to the newly hatched larvae. The obtained results revealed that the larval stages suffered greatest mortality followed by the pre-pupal stage, the pupal stage and lastly the moths for the four compounds. The highest mean percentage mortality of overall immature stages within the three generations (98.8, 98.2, 98.0 and 96.3%) was (Canada sal, Canada amino, Canada magic and Canada foliar), respectively. Analysis of variance between the mean larval duration and Percentage pupation for the remaining larvae and pupae of the three generations, showed significant differences between treatments and control (L.S.D =2.33 & 6.3), respectively. Moreover, all larvae fed on treated leaves gave the least percentage of adults , emergence and a few malformations, also, no eggs were laid by the resulting females in the three generations. Data demonstrated that the larval and pupal weights recorded insignificant differences between treated and untreated.
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