INCIDENCE OF CERTAIN ARTHROPOD PESTS AND PREDATORS INHABITING COWPEA, WITH SPECIAL REFERENCE TO THE VARIETAL RESISTANCE OF SELECTED CULTIVARS TO BEMISIA TABACI (GEN.) AND TETRANYCHUS URTICAE KOCH. تواجد بعض الآفات من مفصليات الأرجل والمفترسات المصاحبة لها على زراعات اللوبيا مع الإشارة لمقاومة بعض أصناف اللوبيا للذبابة البيضاء BEMISIA TABACI (GEN.) وأکاروس العنکبوت ا | ||||
| Assiut University Bulletin for Environmental Researches | ||||
| Article 4, Volume 7.1, Issue 7.1, March 2004, Page 31-38 PDF (469.93 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/auber.2004.150591 | ||||
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| Abstract | ||||
| ABSTRACT : Incidence and faunistic composition of arthropod pests and their associated predators in cowpea plantations have been determined during 2000 and 2001 growing seasons in Assiut Governorate. Fifteen phytophagous species and five arthropod predators in addition to unidentified true spiders were recorded by using sweep net method. Results indicated that the dominance percentages of arthropod pests was higher than those of predators. The most dominant pest species were the piercing sucking pests Empoasca spp.; Nezara viridula, Creontiades pallidus and the lycaenid Lambides boeticus. However, the most dominant predators were Coccinella undecimpunctata; Orius spp. and Scymnus interruptus. Also results, exhibited distinct compatability between the abundance of the above mentioned pests and their associated predators. These results must be use to enable these biological control agents in suppressing cowpea pests and regulate their numbers. Regarding to the relative susceptibility of the tested cowpea cultivars to the whitefly Bemisia tabaci and the two spotted spider mite Tetranychus urticae the cowpea cultivar Kaha 1 only showed some sort of resistance against the two pests. It appeared as low resistant (LR) and moderately resistant (MR) cultivar against these two pests, respectively. Leaf morphological characters and/or sap nutrients of this cultivar may be the main factors responsible for the existence of these resistance degrees. Therefore, plant breeders must be study characters of this cultivar in more details and transfere the desirable one’s into the other new produced cowpea cultivars. تم حصر الآفات الحشرية من مفصليات الأرجل والمفترسات المصاحبة لها على زراعات اللوبيا ودراسة ترکيبها النوعى بمحافظة أسيوط خلال موسمى 2000، 2001م . أظهرت النتائج تواجد 15 نوعاً من الحشرات آکلة النباتات وصاحبها خمسة أنواع من المفترسات الحشرية بالإضافة لبعض العناکب. وقد وجد أن درجة السيادة للآفات کانت عالية جداً مقارنة بسيادة المفترسات المصاحبة لها. وقد کانت أکثر الآفات سيادة هى نطاطات الأوراق Empoasca spp. تلاها البقة الخضراء Nezara viridula ثم بق إسقاط البراعم الزهرية واللوز Creontiades pallidus ثم أبى دقيق البقوليات Lambides boeticus . بينما کانت أکثر المفترسات سيادة هو أبى العيد ذو الإحدى عشر نقطة Cocinella undecimpunctata ثم بق الأزهار Orius spp. ثم حشرة الأسکمنس Scymnus interruptus . کما أظهرت النتائج أيضاً درجة واضحة من التوافق بين وفرة کل من الآفات الحشرية والمفترسات المصاحبة لها . ويجب أن تفيد النتائج المتحصل عليها فى تمکين عناصر المکافحة البيولوجية فى خفض اعداد آفات اللوبيا . أما بالنسبة لحساسية أصناف اللوبيا المختبرة لکل من الذبابة البيضاء Bemisia tabaci وأکاروس العنکبوت الأحمر Tetranychus urticae فقد أظهر صنف اللوبيا قها 1 بمفرده نوعاً من أنواع المقاومة لکلتا الآفتين. وقد تعود درجات المقاومة هذه للصفات المورفولوجية لأوراق هذا الصنف أو لنوعية المواد الغذائية فى عصارة أوراقه؛ لذا يجب على مربى النباتات دراسة صفات هذا الصنف من اللوبيا بالتفصيل ونقل المرغوب منها إلى أصناف اللوبيا التى يتم إنتاجها حديثاً . | ||||
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