Sameha Abdelmonem Metwally <br/><br/>
The Relative Susceptibility of Certain Maize (Zea mays L.)  Cultivars to Infestation with the Pink Stem Borer =   Sesamia  cretica Led. (Lepidoptera : Noctuidae) /  
  =   Sesamia cretica Led (Lepidoptera: Noctuidae) القابلية النسبية لبعض أصناف الذرة الشامية للإصابة بدودة القصب الكبيرة  
Sameha Abdelmonem Metwally ; Supervised Sayeda Sayed Ahmed Abdelsamad , Ahmed Mohamed Semeada Abdallah , Sayed Ahmed Safina Eissa  
 - Cairo :   Sameha Abdelmonem Metwally ,   2015 
 - 132 P. :   charts , facsimiles ;   25cm 
<br/><br/>Thesis (M.Sc.) - Cairo University - Faculty of Agriculture - Department of Economic Entomology and Pesticides 
<br/><br/> The Pink Stem Borer, Sesamia cretica Led. (Lepidoptera: Noctuidae) is a serious pest  threatening maize (Zea mays L.) plants in Egypt. The relative susceptibility of 18 recommended  maize cultivars to infestation with this pest under natural infestation condition was investigated at  2Wadi Al-Natroon3 and 2Giza3 regions throughout 2011 and 2012 seasons. Criteria used for  comparing susceptibility to infestation were the percentage of 2Total Infested Plants3 (% TIP),  percentage of 2Dead Hearts3 (% DH) and 2Infestation Rate3 (IR) [which is based on an arbitrary  5-class rating system]. The percentage of 2Yield-Loss3 (% YL) was also considered in the  evaluation process. At Wadi Al-Natroon region, maize plantations were subject to relatively higher  insect populations than at Giza. According to % TIP at Wadi Al-Natroon in 2011 season (where  and when the highest levels of infestation were recorded) tested maize cultivars could be classified  into 5 significantly different susceptibility groups. None of the tested cultivars showed immunity  or high resistance. Four cultivars were resistant, 4 were relatively resistant, 5 were relatively  resistant to susceptible, 2 were susceptible and 3 were highly susceptible. A positive correlation  between infestation criteria and % YL was recorded. During the two considered seasons and at the  2 investigation regions, grain-yield ranged 11.0 - 29.4 Ardabs/feddan, and yield-loss ranged 1.0 -  18.0%  
<br/><br/>
<br/><br/><label>Subjects--Index Terms: </label>Sesamia cretica Led.  Susceptibility of maize cultivars to infestation Zea mays L.