Samaa Mahmoud Shawky Abd-El Moneim


A survey carried out in 5 different localities namely, lsmailia,Areesh,Sadat, I Nobaria and Fayoum showed the presence of nine nematode genera of common ' association with olive. These genera arc Me/oidogyne, RO!ylenchu/us, ljlenchu/us. I Pratylenc/ws, ,Helicotylenclzus,Ditylencltus, Tylenclms and /'.1acropotlwnia. The root­ knot nematodes, /'.1eloidogyne .1pp. are the most frequent in the five sur•veyed localities followed by Rotylencltulus reni(ormi.1• and Tylenclzulus semipenetram - El -Nobaria showed the highest frequency of the root-knot and the reniform nematode occurrenc. I The study of the economic threshold of the root- knot nematode /11. incognita on five olive cultivars showed that the nematode reproduced variablcy on the fin• tt•sted cultivars. Nematode final population increased with the increasing initial inoculum level. The cultivar hamed was the most susceptible followed by picual, karotina and manzanillo, however the cultivar dolsy exhibited some resistance. The seasonal variations of the root- knot nematode, /'.1.incognita on three olive cultivars in sandy and calcareous soils was studied. Sandy soil was favor to nematode' infectivity and reproduction than calcareous soil especially on the susceptible cultivar, hamed which har•bor•ed higher numbers of soil population ,galls and egg-masses /g root than those on picual and manzanillo at any time of the year in both soil types. Organic matter• of plant and animal origin namely, poultry droppings (PO), pigeon droppings (PI), eucalyptus d•1' leaves (E) , garlic fresh leaves(G) at the rate of I 0 g./pot, the nematicides temik (T) and vydate (V) at half and full recommended doses as well as the biocide nemaless(N L) were used to control the root- knot nematode ,111. incognita infecting olive cultivars under green house conditions. The organic matter were added to pots soil in certain sequences for 3 months with one month inter•val with or without half dose of nematicides. All the tested sequences of additions significantly reduced the numbers of nematodes in soil and on roots. The recommended dose f • vydate (V) added once, one month after nematode inoculation , accomplished the best significant results with c.v. hamed , the most susceptible cultivar, followed by the sequence (E+G+I'I), (I'O+E+I'O). The organic matter, poult11' or• pigeon droppings, eucalyptus d•1' leaves and garlic fr•esh leaves could efficiently control the root-knot nematode especially under moderate levels of nematode infestations. However•, under sever•e infestation , nematicides might be applied first to reduce the populations to levels could be managed by the application of organic materials .Thus, vydate gave the best result with c.v. hamed , the most susceptible cultivar, while on moderately susceptible cultivars,i.e karotina, manzanillo and picual. The organic matter overmastered the nematicides is the majority of cases. Under low levels of nematode infestation like on c.v.

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Other Titles دراسات على المقاومة المتكاملة لبعض انواع النيماتودا التى تصيب الزيتون
Issue Date 2001

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