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Relationship Between Glomus Fascicula Tum Root Colonization of Cotton and Its Effect On Meloidogyne Incognita1)

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For more content, see Nematology.

The interaction between Glomus fasciculatum and Meloidogyne incognita on cotton was studied in the greenhouse. No increases in plant growth were noticed at mycorrhizal inoculation rates of 30 to 480 chlamydospores per plant. Plant growth, however, increased 41 % when inoculated with 750 spores per plant, equivalent to one spore per cm3 soil. Inoculation of 30 spores per plant resulted in root colonization of only 38% and no effect on the nematode population. At densities of 60, 120 and 240 spores per plant, mycorrhizal root levels increased to 55-60% and egg number per plant was significantly reduced. At concentrations of 480 spores per plant, and root colonization levels of 87% , total egg and nematode densities were greatly suppressed. Nematodes and eggs were reduced 41 % on plants inoculated simultaneously at planting with 750 spores, compared to plants inoculated with the nematode alone. The symbiont caused a reduction of 59% in egg and nematode numbers per gm. of root. Fungal root colonization associated with this reduction exceeded 90 % .

Affiliations: 1: Institut fur Pflanzenkrankheiten, Nußallee 9, 5300 Bonn, Germany


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