Population fluctuation of the reniform and root-knot nematodes on selected crops [Philippines]
1986
Capili, L.N. | Castillo, M.B.
Based on nematode populations and crop injury indicators, bush sitao, peanut, okra, mustard and pechay were susceptible to R. reniformis. Okra was highly susceptible to M. incognita, as indicated by significant yield reductions, high root gall and root necrosis ratings, and population at last harvest. Population fluctuations were influenced by the initial nematode density and the crops' growth stages. Competition for food by the nematode during the early stage of crops development influenced the change of the nematode populations in the succeeding crop stages. Phenamiphos applied at the rate of 10 kg a.i./ha was effective against nematodes throughout the entire crop growth stages. This was indicated by the relatively low nematode counts in treated sub-plots throughout the three cropping periods. Multiple regression analyses indicated positive relationship between nematode density and yield loss of bush sitao
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