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[9000501.] رقم البحث : 9000501 - |
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Ecological Studies on Plant Parasitic Nematodes Associated with Certain Fruit Trees in North Sinai Governorate / |
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Agricultural Research Journal Suez Canal University / |
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S. A. H. Eid |
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M. E. Mahrous |
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M. N. El-Basiony |
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A. A. El-Sebaei |
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Citrus; olive; peach; plant; parasitic; nematodes; plant Nematology; Nematology |
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Eight genera of plant parasitic nematodes were found in association with peach trees grown in nine localities of North Sinai Governorate. These genera were Criconemoides, Helicotylenchus, Hoplolaimus, Longidorus, Meloidogyne, Paratylenchus, Tylenchorhynchus and Xiphinema. The most frequently genera in the total collected samples were Meloidogyne spp., Longidorus spp., Helicotylenchus spp. and Tylenchorhynchus spp.. Their percentages of frequency occurrence were 65.29, 63.52, 52.35 and 42.94% respectively. While the highest values of population density were detected the genera Helicotylenchus, Meloidogyne, Tylenchorhynchus and Hoplolaimus. Their population density per 250 gm soil were 95, 84, 78 and 46 nematodes, respectively. The genera Helicotylenchus, Meloidogyne and Tylenchorhynchus were found with high prominence values. On the other hand, ten genera of stylet bearing nematodes were detected in the rhizosphere of olive trees grown in five localities at three counties in North Sinai Governorate. These genera were Helicotylenchus, Hoplolaimus, Longidorus, Meloidogyne, Rotylenchulus, Trichodorus, Tylenchorhynchus, Tylenchulus, Tylenchus and Xiphinema. The most frequently genera in the total collected samples were Meloidogyne, Tylenchorhynchus, Rotylenchulus and Trichodorus. Their percentages of frequency occurrence were 82, 60, 58 and 52% respectively. Regarding population density of the identified genera, it was found that Meloidogyne spp. occupied the first rank ( 247 juveniles per 250 gm soil ) followed descendingly by Helicotylenchus (144), Tylenchorhynchus (131) and Rotylenchulus (117). The highest numbers of Meloidogyne were detected in Wadi Al-Arish ( Al-Arish county ) and Al-Kharouba (El-Sheikh Zewied county ), while the lowest numbers were found in Al-Zawaraa (El-Sheikh Zewied county) and Al-Husseinat ( Rafah county ). Also nine genera of nematodes were found in association with citrus trees grown in Sahel El-Bahr and Canada localities ( Rafah county ). These genera were Criconemoides, Helicotylenchus, Hoplolaimus, Longidorus, Trichodorus, Tylenchorhynchus, Tylenchulus, Tylenchus and Xiphinema. The most frequently genera in the total collected samples were Tylenchulus, Tylenchorhynchus, Tylenchus, Helicotylenchus and Hoplolaimus. Their percentages of frequency occurrence were 72.12, 70.19, 64.43, 59.62 and 60.58% respectively. Regarding population density of the identified genera, it was found that, Tylenchulus semipenetrans gained the highest value (437 individuales per 250 gm soil ). This nematode can be considered as the dangerous pest attacking citrus orchards in North Sinai Governorate. |
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