Abstract:
In Egypt and several other parts of the world there are many nematode pests parasitize on citrus,
one of which is the citrus nematode (Tylenchulus semipenetrans Cobb) that causes slow decline
disease and causing yield losses ranging from 8.7 to 14.2%. Twenty years old trees of Balady
mandarin (Citrus reticulata Blanco) budded on sour orange rootstock (Citrus aurantium,
L.Osbeck) and growing in loam soil in a private orchard infected with nematode, located at El
Mansorya County, El Giza Governorate, Egypt were selected for two seasons (2015 and 2016)
and treated by different natural materials i.e. Magnetite (Magnetic iron ore), Tourmaline ore,
Biocide ore as a source of silicon and Nemastop as a source of garlic extract to control citrus
nematode. The treatments and its concentrations were Magnetite ore at (500, 750 gm/ tree),
Tourmaline ore + Biocide ore at (20,40gm/ tree for each), Nemastop at (25, 50 cm3
/ tree) and
control treatment. Data showed that, the best treatment respectively; was 500gm of Magnetite
ore / tree for achieving maximum average nematode reduction % in roots (- 85, - 84%) over zero
days (initial population) during the two seasons (2015 and 2016), and for achieving maximum
averages of total root phenols content (%) which play a major role in pathophysiological
reactions in tissues inducing a defense mechanism and resistance to aggressive pathogens. Also,
the same treatment resulted in maximum yield and high fruit quality (Juice weight %, T.S.S/
Acid and Vitamin C). Based on the economic study, it could be recommended to use 500 gm of
Magnetite ore for achieving the best total yield and producing the highest net profit / fed. (3390
L.E) followed by either use 20gm. of Tourmaline ore/ tree plus 20gm. of Biocide ore/ tree (2115
L.E) or use 50 cm3 Nemastop / tree (1425 L.E). Also, it must be preferred the available material
and least price in the market |
