Umeh Ethel-Doris N. <br/><br/>
Natural biological control of African rice gall midge in Nigeria. 
/ Ethel-Doris N. Umeh, Ravindra C. Joshi, Mark N. 
. - Ibadan   : IITA, 1991
. - 13 p.  : couv. ill.  ; 30 cm. 
 - IITA Research Guide  37 .
<br/><br/>Bibliogr. 
<br/><br/><label>Universal Decimal Class. No.: </label>633.18.