Abdallah,  Y. E. Y.  <br/><br/>
Ecological factors affecting the population activity of Sap-Sucking pests inhabiting cotton fields in three different agro-ecosystems  [electronic resource]. 
 العوامل البيئية المؤثرة على نشاط مجاميع الآفات الماصة لعصارة النبات والموجودة بحقول القطن فى ثلاثة أنظمة بيئية مختلفة. 

 - p.359-371. 
<br/><br/>Includes references. 
<br/><br/> The present investigation was carried out at three different agro-ecosystems namely; Qalyubyia, Sbarkia and Dakahlia during 1999 and 2000 cotton growing seasons. Obtained results revealed that for T. urticae, two peaks characterized each district in the two seasons. The two peaks occurred during May in the 2000 season, while the 1st took place in May and the 2nd in July in the 1999 season. A. gossypii (Clover) had two main periods of activity at all locations. The 1st period occurred during April-May and the 2nd was during August-September in 2000 and in 1999, the same trend was observed in Qalyubyia only. In Sharkia and Dakahlia another peak was formed during July. 
<br/><br/><br/>Summary in Arabic. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cotton--Diseases and pests<br/>Insect population density<br/>Tetranychus urticae.<br/>Aphis gossypii.<br/>Sweetpotato whitefly.