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Agro-Science
Journal of Tropical Agriculture, Food, Environment and Extension
 

ISSN 1119-7455
   
 
         
 
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Article No 3 of Volume 4.2 (2005)
 
    
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EFFECTS OF N-FERTILIZATION AND SPACING ON AFRICAN RICE GALL MIDGE, Orseolia oryzivora HARRIS AND GAGNÉ IN A SUB-HUMID AREA OF SOUTHEASTERN NIGERIA

1Ogah, E. O., 2Echezona, B. C. and .3Umeh, E.-D. N.

1 Department of Crop Production and Landscape Management, Ebonyi State University, P.M.B. 053, Abakaliki, Nigeria.

2 Department of Crop Science, University of Nigeria, Nsukka, Nigeria.

3 Department of Applied Entomology, Enugu State University of Science and Technology, Enugu, Nigeria.

 

Corresponding Author: Echezona, B. C. Department of Crop Science, University of Nigeria, Nsukka, Nigeria.

 

ABSTRACT

 

Nitrogen fertilization and spacing hold a strong promise in the integrated management of rice insect pest problem. Therefore, three levels of urea: 0, 80 and 160 kg N ha -1 and three spacings: 10-cm x 10-cm, 20-cm x 20-cm and 30-cm x 30-cm were evaluated for two years in Abakaliki, Nigeria, for the control of rice gall midge. The experiment was set up using split-plot arrangement in a randomized complete block design (RCBD) with three replications. Results of the trial showed that nitrogen significantly increased incidence by gall midge (P<0.05) with 160 kg N ha-1 recording the highest incidence of 50.95% and 36.01% in 2002 and 2003 trials, respectively. Similarly, incremental doses of urea n-fertilizer increased the grain yield of rice but only up to 80 kg N ha-1. Beyond this level further n-fertilization had no effect. Generally, increasing plant population significantly increased the incidence by the midge (r = 0.93 and 0.99 in both years). Conversely, grain yield was significantly reduced with increasing population. Differences among treatment combinations between nitrogen and spacing however did not produce any significant effect.

 

Keywords: African rice gall midge, N-fertilization, Spacing, Sub-humid

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Date:16/01/2018
 
     
 
 
 
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