Abstract
Laboratory and field experliments were conducted at the college of Agriculture, university of Baghdad during the spring season , 2012 to estimate the population density, seasonal abundance and the nature of damage of the corn leafhopper on 4 cultivars of corn . The results was showed that the infestation with the leafhopper Empoasca decedans ( paoli) begining after seedling emergence. Symptoms characterized by the presence of yellow lines on leaves which turn into brown and kill of seedlings in severe infestation . Two peaks of the leafhopper were observed during the growing season ,the first high peak of 16/leafhapper /trap occure during the last week of April will the second peak of 9.6 leafhopper /trap occurred during the 3rd week of May. The American cultivar( pop- corn) was distingushed by its highest numbers of leafhopper of 16.66 leafhopper /sweep net , which significantly different from numbers of insect recorded to cultivar buhooth 106 ,IPA 5018 and kafer which amounted for 9.04 , 9.9 4 and 9.87 leafhopper /sweep net respectively. The highest percentage of leaf damage on the 1st , 2nd,3ed ,4th , 5th , and 6th leaves of 35% on pop corn , which significantly different from percentages of damage on other cultivars which amounting for 7.9, 14.5 and 21.4% for kafer , Buhooth 106 and IPA 5018 respectively . It seems that the leafhopper prefer to feed on old leaves in base of the seedling and then it moves gradually to upper leaves toward the top of plant . It is clear from these results that the American pop corn were the highest infestation to the Leafhopper E. decedans and the least was kafer .
Highlights
حيث تؤخذ 10نباتات مف كؿ مكرر اي بواقع 30نبات لكؿ صنؼ بشكؿ عشوائي وقورنت نسبة الضرر الناجمو عف الاصابة لكؿ ورقة مع او ارؽ نباتات نفس صنؼ الذرة السميمة المزروعة في البيت الزجاجي وبذلؾ تـ تحديد النسبة المئوية لمضرر في مستويات او ارؽ النبات الواحد لإصناؼ الذرة المصابة لمعرفة مدى حساسية كؿ صنؼ وكؿ مستوى مف مستويات أو ارؽ النبات عمى الاصناؼ الاربعة أبتداءا مف
The results was showed that the infestation with the leafhopper Empoasca decedans begining after seedling emergence
The American cultivar( pop- corn) was distingushed by its highest numbers of leafhopper of 16.66 leafhopper /sweep net, which significantly different from numbers of insect recorded to cultivar buhooth 106,IPA 5018 and kafer which amounted for 9.04, 9.9 4 and 9.87 leafhopper /sweep net respectively
Summary
حيث تؤخذ 10نباتات مف كؿ مكرر اي بواقع 30نبات لكؿ صنؼ بشكؿ عشوائي وقورنت نسبة الضرر الناجمو عف الاصابة لكؿ ورقة مع او ارؽ نباتات نفس صنؼ الذرة السميمة المزروعة في البيت الزجاجي وبذلؾ تـ تحديد النسبة المئوية لمضرر في مستويات او ارؽ النبات الواحد لإصناؼ الذرة المصابة لمعرفة مدى حساسية كؿ صنؼ وكؿ مستوى مف مستويات أو ارؽ النبات عمى الاصناؼ الاربعة أبتداءا مف. ABSTRACT Laboratory and field experliments were conducted at the college of Agriculture, university of Baghdad during the spring season , 2012 to estimate the population density, seasonal abundance and the nature of damage of the corn leafhopper on 4 cultivars of corn . -3جمعت أعداد مف القفا ازت مف حقؿ التجربة :بواسطة الشبكة الكانسة وصبرت وحممت وأرسمت الى مركز بحوث ومتحؼ التاريخ الطبيعي -جامعة بغداد لغرض التشخيص . - 4تقدير الأض ارر الناجمة عف الإصابة بقفاز الاو ارؽ في حيث بمغ معدؿ عدد القفاز 16قفاز /مصيدة ثـ بداء اليو ( ) 16الى وجود ذروتاف لقفاز الاو ارؽ E.
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