Khidr, A. A. <br/><br/>
Evaluating the toxicity and latent effect of spinosad against different instar larvae of the american bollworm, helicovrpa armigera (Hubner).  [electronic resource]. 
 تقييم التأثير السام والمتأخر للمبيد الحيوى سبينوساد ضد الأعمار اليرقية المختلفة لدودة اللوز الامريكية.‪ 

 - p.177-188. 
<br/><br/>Includes references. 
<br/><br/> Spinosad is an insect biocontrol agent. Spinosad is derived from the metabolites of the naturally occurring bacteria, Saccharoployspora spinosa.  The objective of this study is to evaluate the toxicity as well as the latent efficiency of spinosad against the 2nd,3rd,4th,5th and 6th larval  instars of the American bollworm, Helicoverpa armigera (Hübner). The biocide was assayed after 24, 48, 72 and 96 hours.  The highest efficacy of the biocide was noticed after 96 hours post treatment. The efficiency of the bioassay reflecting  the larval susceptibility could be descendingly arranged as follow; the second, third, fourth, fifth and sixth larval instars.  The corresponding LC50 and LC90 values against the tested larvae after 96 hours were  10.29 & 112.54, 38.73 & 482.55, 64.02 & 1044.88, 81.05 & 1728.86 and 141.94 & 3642.72 ppm; respectively. 
<br/><br/><br/>Summary in Arabic. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Helicoverpa armigera--Biological control.<br/>Biological pest control agents.<br/>spinosad